- Construction of the A/B/C core of mexicanolides via a tandem double-aldol reaction
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An efficient and concise approach for rapid assembly of the ABC tricyclic carbon skeleton of mexicanolide-type limonoids is described. The acetal/ketal diketoester precursors were prepared from simple starting materials by LiOH-mediated Michael reactions. The ABC tricyclic skeleton bearing multiple stereogenic centers was efficiently constructed by a powerful one-pot cascade reaction, which includes acetal/ketal hydrolysis, double intramolecular aldol condensation, and alkene migration.
- Zhang, Quanzheng,Xu, Dan,Yang, Jiao,He, Ling,Zhang, Min
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Read Online
- Copper(I)-catalyzed [2 + 2] photocycloadditions with tethered linkers: Synthesis of syn-photodimers of dicyclopentadienes
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Cu(I)-catalyzed intramolecular photocycloadditions of diesters made of endo-dicyclopentadiene derivatives linked by the ester bonds with tethers are highly regio- and stereoselective and complete within hours, and the tethers can be easily cleaved afterward upon reduction with LiAlH4. Irradiation of the diesters afforded a 1:1 mixture of the heretofore unknown exo-cis-exo dimer, originating from the (R,S/S,R) diastereomer of the diester and the exo-trans-exo, deriving frond the (R,R/S,S) diastereomer. The intermolecular photodimerization yielded, instead, only exo-transexo isomers and side products after irradiation for several days. The role of the tether's length and structure on the course of the photocycloadditions was investigated, and it was observed that short tethers introduce considerable strain in the products' framework. Adamantyl-containing tethers the shortest reaction times and highest yields. X-ray diffraction analysis of an exo-cis-exo provided stereoisomer containing adamantane in the tether exhibited an unusually close approach between H atoms on the methylene bridges and a long C-C distance in the cyclobutane ring. A rearrangement induced by X-ray irradiation was observed in this molecule.
- Galoppini,Chebolu,Gilardi,Zhang
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Read Online
- Aziridine-2-carboxylic acid derivatives and its open-ring isomers as a novel PDIA1 inhibitors
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[Figure not available: see fulltext.] Acyl derivatives of aziridine-2-carboxylic acid have been synthesized and tested as PDIA1 inhibitors. Calculations of charge value and distribution in aziridine ring system and some alkylating agents were performed. For the first time was found that acyl derivatives of aziridine-2-carboxylic acid are weak to moderately active PDIA1 inhibitors.
- Leite, Irena,Andrianov, Victor,Zelencova-Gopejenko, Diana,Loza, Einars,Kazhoka-Lapsa, Iveta,Domracheva, Ilona,Stoyak, Marta,Chlopicki, Stefan,Kalvins, Ivars
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p. 1086 - 1106
(2022/01/12)
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- Fluorescent molecular photoswitch based on basket-shaped porphyrins
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Here we present two novel basket-shaped porphyrins bridged by photochromic diarylethene derivatives, which show significant photoswitchable fluorescent properties. Their synthesis, structures, photochromism and fluorescence characteristics were reported in detail. They are desirable for reversible light-driven fluorescent molecular switches.
- Yan, Liying,Xiong, Chaochao,Jin, Piaopiao,Luo, Qianfu
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supporting information
(2020/07/03)
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- SUBSTITUTED HETEROCYCLIC INHIBITORS OF LYSINE BIOSYNTHESIS VIA THE DIAMINOPIMELATE PATHWAY
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The present invention relates to certain heterocyclic compounds of Formula (I) that have the ability to inhibit lysine biosynthesis via the diaminopimelate biosynthesis pathway in certain organisms. As a result of this activity these compounds can be used in applications where inhibition of lysine biosynthesis is useful. Applications of this type include the use of the compounds as herbicides. Formula (I)
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Paragraph 0155
(2020/05/19)
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- Photostimulus-Responsive Large-Area Two-Dimensional Covalent Organic Framework Films
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Using an external stimulus to modulate the electronic structure of covalent organic frameworks (COFs) is very important because such a response will endow them with additional functions. A two-dimensional (2D) COF, constructed from a photo-responsive unit (1,2-bis(5-formyl-2-methylthien-3-yl)cyclopentene), can reversibly switch its electrical conductivity 200 times from low state (the open form) to high state (the closed form) upon irradiation with UV light and reversible with visible light. This reversible phenomenon can be monitored through a circuit containing a light-emitting diode (LED). Photoinduced ring-closing/opening reactions do not destroy the integrity of the frameworks, and both processes follow logarithmic carrier generation with time. Moreover, the correlation between COFs electronic properties and changes in photoinduced kinetics and absorption curves has been demonstrated.
- Yu, Fei,Liu, Wenbo,Li, Bang,Tian, Dan,Zuo, Jing-Lin,Zhang, Qichun
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supporting information
p. 16101 - 16104
(2019/11/05)
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- Synthesis and properties of tetraphenylethylene derivatived diarylethene with photochromism and aggregation-induced emission
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A series of new diarylethene compounds with both photochromism and aggregation-induced emission have been synthesized by connecting tetraphenylethene and triphenylethene to the bisthienylethene. All the four compounds exhibit good photochromism upon irradiation with alternative UV and visible light. And they are all provided with aggregation-induced emission properties in tetrahydrofuran solution with different fraction of water, non-emissive in the pure tetrahydrofuran solution but yellowish green fluorescence in the aggregate or solid state. Furthermore, the compounds connecting tetraphenylethene to the bisthienylethene were found to exhibit the stronger fluorescence emission in the aggregate or solid state than the ones connecting triphenylethene to the bisthienylethene.
- Dong, Huan,Luo, Miao,Wang, Sheng,Ma, Xiang
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p. 118 - 128
(2016/12/26)
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- Novel bivalent securinine mimetics as topoisomerase I inhibitors
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A series of novel bivalent securinine mimetics incorporating different linkers between C-15 and C-15′ were synthesized and their topoisomerase I (Topo I) inhibitory activities evaluated. It was thus revealed that mimetic R2 incorporating a rigid m-substituted benzene linker exhibits Topo I inhibitory activity three times that of parent securinine. Comprehensive structure-activity relationship analyses in combination with docking studies were used to rationalize the potent activity of these bivalent mimetics. Mechanistic studies served to confirm the deductions arising from docking studies that the active bivalent mimetics not only inhibited complexation between Topo I and DNA but also stabilized the Topo I-DNA complex itself.
- Hou, Wen,Lin, Hui,Wang, Zhen-Ya,Banwell, Martin G.,Zeng, Ting,Sun, Ping-Hua,Lin, Jing,Chen, Wei-Min
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p. 320 - 328
(2017/03/08)
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- A Two-Directional Synthesis of (+)-β-Isosparteine
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A two-directional synthesis of (+)-β-isosparteine is described in five steps from glutaric acid, where the entire carbon and nitrogen backbone of the alkaloid, possessing the requisite relative and absolute stereochemistry at its four stereogenic centers, is assembled using a double imino-aldol reaction.
- Al-Saffar, Firas M.,Brown, Richard C. D.
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supporting information
p. 3502 - 3504
(2017/07/15)
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- Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone
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Abstract: Synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology is presented. Synthesised polyesters consist of bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene as a mesogen and aliphatic diacid chloride as flexible spacer. The length of oligomethylene units in the polymer was varied from the trimethylene to the dodecamethylene groups. Synthesized polyesters were characterized by differential scanning calorimetry and optical microscopy. The transition temperatures and thermodynamic properties were studied for all these polymers. These polyesters exhibited thermotropic liquid crystalline behavior and showed nematic texture except decamethylene spacer. Decamethylene spacer based polyester showed marble texture of smectic C. Mesophase stability of these polyesters was higher than 123 °C (except first heating cycle of PE-1). Graphical Abstract:: SYNOPSIS The present study deals with the synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology. [Figure not available: see fulltext.].
- Manurkar, Nagesh,More, Sayaji,Mulani, Khudbudin,Ganjave, Nitin,Chavan, Nayaku
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p. 1461 - 1468
(2017/09/27)
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- A class of chiral double-core platinum coordination compounds containing unsaturated bonds, preparation method and applications thereof
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The present invention discloses a class of chiral double-core platinum coordination compounds containing unsaturated bonds and having a structure formula represented by a formula I or II, wherein the compounds have antitumor activity, the synthesis method is simple and easy to perform and is suitable for industrial production, R is selected from the following groups defined in the specification, n is 2-8, D is selected from the following groups defined in the specification, and Z is selected from CH3COO, ClCH2COO, CH3(CH2)6COO, CH3(CH2)8COO and other groups defined in the specification. The formulas I and II are defined in the specification.
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Paragraph 0062
(2017/08/28)
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- Method for preparing acyl chloride by catalyzing phosgene and acid
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The invention discloses a method for preparing acyl chloride by catalyzing phosgene and acid. The method includes the following steps that 1, with carboxylic acid as a raw material, a catalyst and a solvent are added, and under the condition that the temperature is maintained to range from 20 DEG C to 200 DEG C, phosgene is introduced into a reaction flask for a reaction; 2, after the molar ratio of carboxylic acid to phosgene reaches 1:1.0-1:10, phosgene introduction is stopped, reacted mixed liquor is obtained and filtered, obtained filter liquor is subjected to reduced pressure distillation at a high vacuum degree to obtain acyl chloride, and an obtained filter cake continues to serve as the catalyst in the step 1 to be recycled. Compared with an existing catalyst adopted for preparing acyl chloride according to a phosgene method, the catalyst used in the method is small in dosage, convenient to recycle, easy to separate from a product, better in product quality, safe, stable and environmentally friendly, generated solid waste is greatly reduced, the experience of operators is greatly improved, and safety risks are lowered.
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Paragraph 0079; 0080; 0081
(2016/10/20)
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- Understanding the effects of preorganization, rigidity, and steric interactions in synthetic barbiturate receptors
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Synthetic barbiturate receptors have been utilized for many applications due to their high binding affinities for complementary guests. Although interest in this class of receptors spans from supramolecular to materials chemistry, the effects of receptor steric bulk and preorganization on guest binding affinity has not been studied systematically. To investigate the roles that steric bulk and preorganization play in guest binding, we prepared a series of 12 deconstructed Hamilton receptors with varying degrees of steric bulk and preorganization. Both diethylbarbital and 3-methyl- 7-propylxanthine were investigated as guests for the synthetic receptors. The stoichiometry of guest binding was investigated using Job plots for each host-guest pair, and 1H NMR titrations were performed to measure the guest binding affinities. To complement the solution-state studies, DFT calculations at the B3LYP/6-31+G(d,p) level of theory employing the IEF-PCM CHCl3 solvation model were also performed. Calculated guest binding energies correlated well with the experimental findings and provided additional insight into the factors influencing guest binding. Taken together, the results presented highlight the interplay between preorganization and steric interactions in establishing favorable interactions for self-assembled hydrogenbonded systems.
- McGrath, Jacqueline M.,Pluth, Michael D.
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p. 711 - 719
(2014/04/03)
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- Synthesis and binding profile of haloperidol-based bivalent ligands targeting dopamine D2-like receptors
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Homodimers of dopamine D2-like receptors are suggested to be of particular importance in the pathophysiology of schizophrenia and, thus, serve as promising targets for the discovery of atypical antipsychotics. This study describes the development of a series of novel bivalent molecules with a pharmacophore derived from the dopamine receptor antagonist haloperidol. These dimers were investigated in comparison to their monomeric analogues for their D2long, D2short, D3, and D4 receptor binding and the ability to bridge two neighboring receptor protomers. Radioligand binding studies provided diagnostic insights when Hill slopes close to two for the bivalent ligand 13 incorporating 22 spacer atoms and a comparative analysis with monovalent control ligands indicated a bivalent binding mode with a simultaneous occupancy of two neighboring binding sites.
- Salama, Ismail,L?ber, Stefan,Hübner, Harald,Gmeiner, Peter
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supporting information
p. 3753 - 3756
(2014/09/16)
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- Methods for the synthesis of chiral sulfur heterocycles and their application in the asymmetric Baylis-Hillman reactions
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Enantiomerically pure (2S,6S)-2,6-diphenyltetrahydro-2H-thiopyran, (2S)-2-phenyltetrahydro thiophene, and (2S)-2-phenyltetrahydro-2H-thiopyran were prepared in 70-72% yields and with 86-99% ee via cyclization of the corresponding dimesylate in an SN2 cyclization reaction using sodium sulfide nonahydrate. The results on the application of various chiral sulfides in asymmetric Baylis-Hillman reactions are also described.
- Periasamy, Mariappan,Gurubrahamam, Ramani,Muthukumaragopal, Gopal P.
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p. 568 - 574
(2013/06/27)
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- Physical gels made of liquid crystalline B4 phase
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The achiral liquid crystalline materials showing two B4 (HN) phases have been found to exhibit strong gelation ability for various organic solvents with reversible sol-gel phase transition. The gel is formed by helical tubules, which build entangled 3D network, encapsulating the solvent. The equilibrium of left- and right-handed tubules is preserved in the gel, even if the chiral solvent is used.
- Zep, Anna,Salamonczyk, Miroslaw,Vaupotic, Natasa,Pociecha, Damian,Gorecka, Ewa
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supporting information
p. 3119 - 3121
(2013/06/27)
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- Synthesis and biological evaluation of novel sinomenine derivatives as anti-inflammatory agents
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Sinomenine (1) is clinically available for the treatment of rheumatoid arthritis (RA), however, its efficacy is quite weak. In the present study, a library of novel sinomenine-based homodimers and monomers through variable-length linkers were designed and synthesized, and their bioactivities were evaluated using RAW264.7 cells and mice. Among the compounds, 2f and 3b possessed much more potent inhibitory effects on the production of nitric oxide (NO), interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) than 1. Preliminary mechanism investigation revealed that 3b inhibited nuclear factor-κB (NF-κB) signaling pathway specifically, 2f suppressed both NF-κB and mitogen-activated protein kinase (MAPK) cascades. Moreover, 3b and 2f significantly alleviated the lipopolysaccharide (LPS)-induced mortality. These two compounds might serve as valuable candidates for anti-inflammatory drug discovery.
- Teng, Peng,Liu, Hai-Liang,Zhang, Lei,Feng, Li-Li,Huai, Yue,Deng, Zhang-Shuang,Sun, Yang,Xu, Qiang,Li, Jian-Xin
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experimental part
p. 63 - 74
(2012/07/14)
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- Rhodium(II)-catalyzed cyclization of bis(N-tosylhydrazone)s: An efficient approach towards polycyclic aromatic compounds
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Ahead of the PAC: Polycyclic aromatic compounds (PACs) can be easily accessed by the combination of Suzuki-Miyaura cross-coupling and a [Rh 2(OAc)4]-catalyzed carbene reaction using easily available bis(N-tosylhydrazone)s as intermediates (see scheme; Ts=4-toluenesulfonyl). Copyright
- Xia, Ying,Liu, Zhenxing,Xiao, Qing,Qu, Peiyuan,Ge, Rui,Zhang, Yan,Wang, Jianbo
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supporting information; experimental part
p. 5714 - 5717
(2012/07/28)
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- Anion recognition by N,N′-diarylalkanediamides
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The preparation of N,N′-diarylalkanediamides from the respective aliphatic dicarboxylic acids and 4-nitroaniline via microwave-prompted reactions is presented. The most positive effect of microwave irradiation was observed for N,N′-bis(4-nitrophenyl)butanediamide. Anion binding studies on the obtained diamides were carried out in DMSO and acetonitrile using UV-vis and 1H NMR spectroscopy. A mechanism for selective fluoride recognition by N,N′-bis(4-nitrophenyl)butanediamide in DMSO is proposed.
- Wagner-Wysiecka, Ewa,Lukasik, Natalia
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supporting information
p. 6029 - 6034,6
(2020/08/20)
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- PRODUCT CONTAINING DIAMIDES, METHOD FOR MAKING SAME AND USES THEREOF
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The product comprises at least two diamide compounds selected from the diamide compounds of following formulae (Ia), (Ib), and (Ic): [in-line-formulae]R2R3NOC-Aa-CONR4R5??(Ia)[/in-line-formulae] [in-line-formulae]R2R3NOC-Ab-CONR4R5??(Ib)[/in-line-formulae] [in-line-formulae]R2R3NOC-Ac-CONR4R5??(Ic)[/in-line-formulae] wherein: R2, R3, R4, and R5, either identical or different, are groups selected from saturated or unsaturated, linear or branched, optionally cyclic, optionally aromatic, optionally substituted, hydrocarbon groups comprising an average number of carbon atoms ranging from 1 to 36, R2 and R3 on the one hand and R4 and R5 on the other hand may optionally form together a ring, optionally substituted and/or optionally comprising a heteroatom, andAa, Ab, and Ac are linear divalent alkyl groups, each comprising a different number of carbon atoms.
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Page/Page column 7
(2012/02/06)
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- Syntheses and reactivities of non-symmetrical "active ester" bi-dentate cross-linking reagents having a phthalimidoyl and acid chloride, 2-benzothiazole, or 1-benzotriazole group
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We have newly synthesized the non-symmetrical "phthalimidoyl active ester" bi-dentate cross-linking reagents having an acid chloride, 2-benzothiazole, or 1-benzotriazole group (i.e., 9, 15, and 16) on the basis of the reactivity study of the "active ester" model compounds, 11-14, toward the various nucleophiles and examined their reaction selectivity towards the same nucleophiles. Then, we applied for the modification of cholesterol at the more reactive site of the bi-dentate linkers to give 3β-cholesteryl 4-(phthalimidoyloxycarbonyl)butyrate (39), and the subsequent reaction of 39 with several amines, such as benzylamine, 4-chlorobenzylamine, 2-phenylethylamine, l-phenylalanine methyl ester, or diphenylalanine benzyl ester as a protein model of the cholesterol antigen.
- Sheikh, Md. Chanmiya,Takagi, Shunsuke,Sakai, Mebumi,Mori, Tasuya,Hayashi, Naoto,Fujie, Tetsuo,Ono, Shin,Yoshimura, Toshiaki,Morita, Hiroyuki
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scheme or table
p. 1244 - 1254
(2011/04/15)
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- Low-energy collision-induced fragmentation of negative ions derived from diesters of aliphatic dicarboxylic acids made with hydroxybenzoic acids
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Diesters of ortho-hydroxybenzoic acid (salicylic acid) made with glutaric, adipic, and pimelic acids are the monomers of some potential drug candidates for aspirin patches. Collision-induced dissociation (CID) spectra of negative ion derived from these compounds show a 120-Da 'neutral loss' specific to the ortho isomers. In contrast, the anions derived from diesters of meta- and para-hydroxybenzoic acids show a 138-Da loss for an elimination of elements of hydroxybenzoic acid by a charge-remote mechanism. Deuterium labeling studies confirmed that the hydrogen atom transferred for hydroxybenzoic acid loss originates specifically from the α position of the dicarboxylic acid moiety. Although all spectra showed a peak at m/z 137, a charge-mediated process specific for the ortho compounds renders it the most prominent peak in the spectra of ortho compounds. Appropriate deuterium labeling experiments demonstrated that the hydrogen atom transferred for the formation of the m/z 137 ion in ortho compounds is specifically derived from the α position of the dicarboxylic acid moiety. Copyright
- Nishshanka, Upul,Attygalle, Athula B.
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experimental part
p. 1502 - 1511
(2009/10/10)
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- Synthesis of N,N′-diarylalkanediamides and their antimycobacterial and antialgal activity
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A set of N,N′-diarylalkanediamides was synthesized. The compounds were tested for their antimycobacterial and antialgal activity. The antimycobacterial activity of N,N′-diarylalkanediamides depends on the lipophilicity of the respective acid. Antimycobacteri-ally active substances were found only in the series of N,N′-diarylethanediamides and N,N′-diarylbutanediamides. Other compounds (derivatives of pentane-, hexane-, octane- and nonanediamide) were inactive against various strains of mycobacteria. The compounds inhibited growth and chlorophyll production in Chlorella vulgaris. Their relatively low antial-gal activity is probably connected with their lowered aqueous solubility, and hence by a restricted passage of the inhibitor through the hydrophilic regions of thylakoid membranes.
- Kubicova, Lenka,Waisser, Karel,Kunes, Jiri,Kralova, Katarina,Odlerova, Zelmira,Slosarek, Milan,Janota, Jiri,Svoboda, Zbynek
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p. 714 - 726
(2007/10/03)
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- Synthesis and Characterization of an Aza-cage, Basicity Behaviour and Crystal Structure of its Diprotonated Species
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The synthesis and characterization of the macrobicycle 4,10-dimethyl-1,4,7,10-tetraazabicycloheptadecane (L) is reported.The proton-transfer properties of L in aqueous solution have been investigated by potentiometry (25 deg C, I = 0.15 mol dm-3) and NMR spectroscopy (1H and 13C).L behaves as a fairly strong base in the first protonation step (log K1 = 11.55), and as a moderate base in the second step (log K2 = 6.94). 1H and 13C resonances have been assigned for both + and 2+ species.NMR experiments also indicate the stepwise protonation sites.Crystals of 2 are orthorhombic, space group Pca21, with a = 13.130(1), b = 16.185(4), c = 20.320(6) Angstroem, and Z = 8; final R value of 0.086 (Rw = 0.079) for 2383 unique observed reflections with I > 3?(I).Two independent 2+ cations are present in the unit cell; they differ from each other in the conformation of the hydrocarbon chain connecting the two unmethylated nitrogen atoms.In both cases the overall cage conformation is due to the presence of two internal hydrogen bonds, connecting the two bridgehead nitrogens and the two methylated nitrogens.
- Bencini, Andrea,Bianchi, Antonio,Bazzicalupi, Carla,Ciampolini, Mario,Dapporto, Paolo,et al.
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p. 715 - 720
(2007/10/02)
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- N,N'-Di(8-quinolyl)glutaramide Exhibiting Highly Selective and Efficient Uphill Transport of Cu(II) through Liquid Membranes
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N,N'-Di(8-quinolyl)glutaramide has been found to be an excellent Cu(II) carrier in the transport through a chloroform liquid membrane.It can selectively and efficiently transport Cu(II) from a weakly acidic aqueous solution containing Cu(II), Zn(II), Ni(II), and Co(II).Several N,N'di(8-quinolyl)glutaramide derivatives and their analogues have been prepared for comparison of this transport ability, which largely depends not only upon te structure of the carriers, but also upon the transport conditions.
- Hiratani, Kazuhisa,Kasuga, Kazuyuki,Hirose, Takuji,Taguchi, Kazuhiro,Fujiwara, Kyoko
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p. 2381 - 2387
(2007/10/02)
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- INTRAMOLECULAR END-TO-END REACTIONS OF PHOTOACTIVE TERMINAL GROUPS LINKED BY POLYMETHYLENE CHAINS.
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Intramolecular end-to-end reactions of a pair of photoactive terminal groups, dibenz left bracket b,f right bracket azepine (DBA) chromophores, linked by a series of polymethylene chains (DBA-CO(CH//2)//nCO-DBA, n equals 2-30) were studied by two different approaches. One approach is to measure the intramolecular deactivation rate constants of the excited triplet state of terminal DBA groups by the nanosecond laser photolysis and the other is to measure the intramolecular photocyclization rates of these bichromophoric compounds by the quantitative product analysis with GPC. The excited triplet state of the DBA group is the intermediate of the reaction.
- Ashikaga,Ito,Yamamoto,Nishijima
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p. 198 - 204
(2007/10/02)
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- Liquid-Crystalline Schiff's Base Polymers
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Liquid-crystal polymers are reported which are prepared from di-(p-formylphenyl)-α-ω-alkanedicarboxylates and p-phenylenediamine.Neither component forms a mesophase but the polymers are typical main-chain liquid crystal polymers.The synthesis of a series of such polymers is described, and the properties of the products are discussed.
- Al-Dujaili, Amar H.,Jenkins, D.,Walton, David R. M.
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- Coordination Polymers of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II), with Glutaric Acid Bis(2,4-Dinitrophenylhydrazide)
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Coordination polymers of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with glutaric acid bis(2,4-dinitrophenylhydrazide) have been prepared and characterised by elemental analyses, infrared, magnetic and thermal data.
- Munshi, Kailash N.,Juneja, Harjeet D.
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p. 708 - 709
(2007/10/02)
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- CHIRAL AMINOACID CONTAINING ACYCLIC LIGANDS-I. SYNTHESES AND CONFORMATIONS
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Synthesis and spectral properties of optically active acyclic ligands, containing two (S)-phenylalanine residues (3a-f) are described.The synthesis is achieved by two different routes.Conformational studies in different solvents are performed by dilution and temperature-dependent experiments of 1H and 13C NMR spectroscopy.
- Lodi, T.,Marchelli, R.,Dossena, A.,Dradi, E.,Casnati, G.
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p. 2055 - 2060
(2007/10/02)
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- Bis-2N-alkylene tetrahydroisoquinoline compounds
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Bis-2N-alkylene tetrahydroisoquinoline compounds are inhibitors of phenylethanolamine N-methyl-transferase.
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- 16. Ionophore vom Typ der 3-Oxapentadiamide
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A series of lipophilic 3-oxapentane diamides were prepared and their selectivity in membranes was studied.N,N,N',N'-Tetracyclohexyl-3-oxapentane diamide forms 1:2- and 1:3-metal/ligand-complexes with Mg(2+) and Ca(2+) respectively and induces a selectivity in membranes for Ca(2+) over Mg(2+) by a factor of about 10E4.
- Pretsch, Erno,Ammann, Daniel,Osswald, Hans F.,Guggi, Marc,Simon, Wilhelm
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p. 191 - 196
(2007/10/02)
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