- Convenient preparations of the three 2,3-dihalo-1,4-benzoquinones
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Efficient preparations of 2,3-dichloro-1,4-benzoquinone (1) and 2,3- dibromo-1,4-benzoquinone (2) from 1,4-benzoquinone are reported, as is the synthesis of the previously unknown 2,3-diiodo-1,4-benzoquinone (3) from 2.
- Yu, Duyi,Mattern, Daniell Lewis
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- The impact of an isoreticular expansion strategy on the performance of iodine catalysts supported in multivariate zirconium and aluminum metal-organic frameworks
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Iodine functionalized variants of DUT-5 (Al) and UiO-67 (Zr) were prepared as expanded-pore analogues of MIL-53 (Al) and UiO-67 (Zr). They were prepared using a combination of multivariate and isorecticular expansion strategies. Multivariate MOFs with a 25% iodine-containing linker was chosen to achieve an ideal balance between a high density of catalytic sites and sufficient space for efficient diffusion. Changes to the oxidation potential of the catalyst as a result of the pore-expansion strategy led to a decrease in activity with electron rich substrates. On the other hand, these larger frameworks proved to be more efficient catalysts for substrates with higher oxidation potentials. Recyclability tests for these larger MOFs showed sustained catalytic activity over multiple recycles.
- Tahmouresilerd, Babak,Moody, Michael,Agogo, Louis,Cozzolino, Anthony F.
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supporting information
p. 6445 - 6454
(2019/05/24)
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- Multigram synthesis of bis[(trimethylsilyl)ethynyl]benzenes suitable for post-polymerization modification
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Novel substituted bis[(trimethylsilyl)ethynyl]benzenes have been prepared as versatile building blocks for organic functional materials. The resulting effects of replacing sulfur by selenium and tellurium on photophysical and electrochemical properties ha
- Gl?cklhofer, Florian,Lumpi, Daniel,St?ger, Berthold,Fr?hlich, Johannes
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p. 2229 - 2232
(2014/06/09)
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- μ-oxo-bridged hypervalent iodine(III) compound as an extreme oxidant for aqueous oxidations
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We have found that in aqueous oxidations the -oxo-bridged hypervalent iodine trifluoroacetate reagent 1 {[(PhI(OCOCF]} is generally more reactive than the corresponding monomeric reagent, especially toward phenolic substrates. -Oxo-bridged 1 in aqueous media thus provided dearomatized quinones 3 in excellent yields in most cases compared to conventional phenyliodine(III) diacetate and bis(trifluoroacetate), as a result of the rapid oxidation of both phenols and naphthols 2. Furthermore, the oxidation reactions proceeded even in water using water-soluble -oxo oxidant 1, which has promise for -oxo-bridged reagent 1 to become the favored reagent over hydrophobic phenyliodine(III) diacetate and bis(trifluoroacetate). Georg Thieme Verlag Stuttgart New York.
- Dohi, Toshifumi,Nakae, Tomofumi,Takenaga, Naoko,Uchiyama, Teruyoshi,Fukushima, Kei-Ichiro,Fujioka, Hiromichi,Kita, Yasuyuki
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experimental part
p. 1183 - 1189
(2012/05/19)
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- BENZOFURAN-4,5-DIONES AS SELECTIVE PEPTIDE DEFORMYLASE INHIBITORS
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The instant invention provides novel benzofuran-4,5-diones and pharmaceutical compositions thereof useful for inhibiting PDF and for treating proliferative and infectious diseases. Compounds may be selective for eukaryotic (e.g., human) PDF or prokaryotic PDF
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Page/Page column 111; 113
(2010/11/18)
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- Synthesis of 2,5-Diaminoquinones by one-pot copper-catalyzed aerobic oxidation of hydroquinones and addition reaction of amines
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The aerobic oxidation of various hydroquinones was achieved by using copper nanoparticles entrapped in aluminum oxyhydroxide [Cu/ AlO(OH)] at room temperature. Furthermore, 2,5diamino-1,4-benzoquinones were synthesized directly from hydroquinone and amines by a one-pot procedure consisting of the copper-catalyzed aerobic oxidation of hydroquinones and the double addition of amines to the resulting quinones.
- Kim, Sungjin,Kim, Daehwan,Park, Jaiwook
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experimental part
p. 2573 - 2578
(2009/12/29)
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- Efficient, multigram-scale synthesis of three 2,5-dihalobenzoquiones
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2,5-Dibromo-, 2,5-dichloro- and 2,5-diiodobenzoquinone were conveniently prepared from 1,4-dimethoxybenzene in 87%, 97% and 84% overall yields. None of the two steps of the synthesis required purification.
- Lopez-Alvarado, Pilar,Avendano, Carmen,Menendez, J. Carlos
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p. 3233 - 3239
(2007/10/03)
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- Antitumour 1,5-diazaanthraquinones
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Compounds having formula (I) wherein R3, R4, R7, and R8 are independently selected from the group consisting of hydrogen, lower alkyl, halogen, amine, mono(lower)alkylamine, di(lower)alkylamine, phenyl, or substituted phenyl possess antitumor activity and are new with the exception of the compound in which R3, R4, R7, R8 are all hydrogen and the compound in which R3 and R7 are hydrogen, R4 chlorine, and R8 is a 2-nitrophenyl group.
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- Oxidation of Hydroquinones and Hydroquinone Monomethyl Ethers to Quinones with tert-Butyl Hydroperoxide and Catalytic Amounts of Ceric Ammonium Nitrate (CAN)
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Mono- and bicyclic hydroquinones and hydroquinone monomethyl ethers 1, 2 are oxidized in 82-91% yield to the corresponding quinones using only 2 mol% of ceric ammonium nitrate (CAN) and 2.5 equivalents of tert-butyl hydroperoxide.
- Krohn, Karsten,Vitz, Juergen
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p. 825 - 827
(2007/10/03)
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- Solid-state Nuclear Bromination of Some Phenols by N-Bromosuccinimide
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Treatment of crystalline dimethylphenols and hydroquinones with N-bromosuccinimide leads rapidly and regioselectively to ring-substituted products.
- Goud, B. Satish,Desiraju, Gautam R.
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p. 244 - 245
(2007/10/03)
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- Concerning the reaction of anti-benzene dioxide with various nucleophiles
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trans-3,4:5,6-Diepoxycyclohex-1-ene (anti-benzene dioxide) (5) was brought into reaction with several S, O, and C nucleophiles. S and O nucleophiles gave the bis-adducts stemming from independent reaction of the two epoxy functions. C nucleophiles, on the
- Esser, Thomas,Farkas, Frederic,Mangholz, Sissi,Sequin, Urs
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p. 3709 - 3720
(2007/10/02)
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- OXIDATION OF AROMATIC AMINES WITH CHROMYL CHLORIDE - I OXYDATION OF AROMATIC PRIMARY AMINES
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The oxidation of aromatic primary amines with chromyl chloride in carbon tetrachloride or chloroform, results in the formation of intermediate solid adducts (Etard adducts) which, on hydrolysis, give azobenzenes(1), 1,4-benzoquinones(2), anilino-1,4-benzoquinones(3), 1,4-benzoquinone anils(4) and anilino-1,4-benzoquinone anils(5) in yields which depend on the position, nature and degree of substitution of the ring.
- Nallaiah, C.,Strickson, J. A.
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p. 4083 - 4088
(2007/10/02)
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