20851-13-2Relevant academic research and scientific papers
THE CONDUCTIVE SULFUR/CARBON MIXTURE CATHODE. AN EFFICIENT SYNTHESIS OF THIOPHENES AND RELATED COMPOUNDS FROM ACETYLENES
Guillanton, Georges Le,Do, Quang Tho,Simonet, Jacques
, p. 2261 - 2262 (2007/10/02)
The electroreduction of Michael acceptors such as acetylenic derivatives at a compact sulfur-carbon electrode in aprotic media affords thioorganic compounds, mainly thiophenes, in fairly high yields.Their formation is discussed as a function of the electronic effect of the substituents on the acetylenic triple bond.
Photochemical and Thermal Reactions of Heterocycles. Part 3. Photoisomerisation, Photofragmentation, and Photodimerisation of Mesoionic 1,3-Dithiol-4-one and -4-imine Derivatives
Kato, Hiroshi,Shiba, Toshie,Aoki, Nobuo,Iijima, Hiroko,Tezuka, Hiroshi
, p. 1885 - 1890 (2007/10/02)
Photolysis of the mesoionic 2,5-diphenyl-1,3-dithiol-4-one (7) gave tetraphenyl-1,4-dithiin, tetraphenylthiophen, diphenylacetylene, and sulphur via the corresponding dimer (11) and 4,5-diphenyl-1,2-dithiol-3-one (12) which were isolable under appropriate conditions.Photolysis of the mesoionic N-benzoyl-2-phenyl-1,3-dithiol-4-imines (14) afforded the corresponding 1,2-dithiol-3-imines (15).The photochemical paths of the mesoionic dithiole systems are discussed in the light of the experimental results.
REACTIONS DE CYCLOADDITION DIPOLAIRE-1,3 DES THIAZOLONES ET DES SELENAZOLONES MESOIONIQUES AVEC L'ACETYLENE DICARBOXYLATE DE METHYLE-II
Baudy, M.,Robert, A.,Guimon, C.
, p. 2129 - 2138 (2007/10/02)
Mesoionic thyazolones and selenazolones react with dimethyl acetylene dicarboxylate to give thiophenes or pyridones.We show that the reactivity of the mesoionic thiazolones towards dimethyl acetylene dicarboxylate may be explanied by second order perturbation theory, limited to frontier orbitals.The influence of the temperature and of the nature of the substituants on the evolution of the primary cycloadduct can be explained by competition between a retro Diels-Alder rection giving a thiophene and a desulfurisation or a deselenurisation giving a pyridone.
QUATERNARISATION DE L'ATOME D'AZOTE DE SYSTEMES TAUTOMERES DE LA SERIE DES OXO-4 THIAZOLES. CYCLOADDITIONS DIPOLAIRES 1,3 DES THIAZOLES MESOIONIQUES FORMES IN SITU
Robert, A.,Ferrey, M.,Marechal, A. Le
, p. 1571 - 1578 (2007/10/02)
4-Hydroxythiazoles and N-acylimino 4-thiazolidinones show similar tautomeric behaviour to azlactones.However, the mechanism of their reaction with dimethylacetylenedicarboxylate or with ethyl vinyl ether differs fundamentally.In the thiazole series, the first step is the quaternization of the nitrogen atom.The mesoionic thiazole intermediate is then trapped by a second molecule of the dipolarophile.
PHOTOOXIDATION OF SOME MESOIONIC AND RELATED SYSTEMS
Kato, Hiroshi,Tani, Kazue,Kurumisawa, Haruki,Tamura, Yoshiko
, p. 717 - 720 (2007/10/02)
Photooxidation of several mesoionic compounds gave ring cleavage products, some of which were apparently formed via the endoperoxides of the mesoionic rings.Photooxidation of a Δ2-oxazolin-4-one and Δ2-thiazolin-4-one gave the corresponding 4,4'-bisoxa- and bisthiazolinone in dichloromethane, whereas the former gave benzamide in dimethylformamide.
