Xi:Irritant;25036-01-5Relevant articles and documents
Direct Evidence on the Mechanism of Methane Conversion under Non-oxidative Conditions over Iron-modified Silica: The Role of Propargyl Radicals Unveiled
?ot, Petr,Hemberger, Patrick,Pan, Zeyou,Paunovi?, Vladimir,Puente-Urbina, Allen,van Bokhoven, Jeroen Anton
supporting information, p. 24002 - 24007 (2021/10/01)
Radical-mediated gas-phase reactions play an important role in the conversion of methane under non-oxidative conditions into olefins and aromatics over iron-modified silica catalysts. Herein, we use operando photoelectron photoion coincidence spectroscopy to disentangle the elusive C2+ radical intermediates participating in the complex gas-phase reaction network. Our experiments pinpoint different C2-C5 radical species that allow for a stepwise growth of the hydrocarbon chains. Propargyl radicals (H2C?C≡C?H) are identified as essential precursors for the formation of aromatics, which then contribute to the formation of heavier hydrocarbon products via hydrogen abstraction–acetylene addition routes (HACA mechanism). These results provide comprehensive mechanistic insights that are relevant for the development of methane valorization processes.
2,3-Dihydro-1H-naphtho[1,8-cd]borinine as a Potent Precursor for Open-Shell Singlet B-Heterocycles
Ito, Shigekazu,Kato, Naoto,Mikami, Koichi
supporting information, p. 2936 - 2939 (2017/06/21)
The reaction of naphthalene-1,8-diylbis[(trimethylsilyl)methanide] and dimethyl arylboronates afforded the corresponding 2,3-dihydro-1H-naphtho[1,8-cd]borinine as single diastereomers. Single-electron oxidation of the boron-containing heterocycles provided acenaphthylene through the generation boron-containing cyclic singlet biradicals.
Synthesis of novel fluoranthene-based conformationally constrained α-amino acid derivatives and polycyclic aromatics via the diels-alder reaction
Kotha, Sambasivarao,Meshram, Milind
, p. 1525 - 1531 (2014/06/10)
Conformationally constrained cyclic α-amino acid moieties have been fused to the fluoranthene system. Aminoindanecarboxylic acid (Aic) and 1,2,3,4-tetrahydroisoquinolinecarboxylic acid (Tic) derivatives were synthesized by an alkylation sequence, whereas a aminotetralincarboxylic acid (Atc) derivative was assembled using the Diels-Alder reaction as a key step. These α-amino acid derivatives are considered as constrained analogues of phenylalanine (Phe) and play an important role in the design and synthesis of bioactive peptides and some fluorescence chemosensor molecules. Moreover, this strategy has been extended to polycyclic aromatics via the Diels-Alder reaction and subsequent aromatization with DDQ. Georg Thieme Verlag Stuttgart New York.
