Reactions of trifluoromethyl-substituted arylacetylenes with arenes in superacids
作者:H. M. H. Alkhafaji、D. S. Ryabukhin、V. M. Muzalevskiy、L. V. Osetrova、A. V. Vasilyev、V. G. Nenajdenko
DOI:10.1134/s1070428013030032
日期:2013.3
Protonation of the C≡C bond in trifluoromethyl-substituted arylacetylenes ArC≡CCF3 by the action of superacids (CF3SO3H or HSO3F) generates vinyl cations ArC+=CHCF3 which react with arenes Ar′H to give alkenes Ar(Ar′)C=CHCF3. Protonation of the latter at the C=C bond in the reaction medium yields stable cations Ar(Ar′)C+-CH2CF3 which are converted into E/Z-isomeric alkenes Ar(Ar′)C=CHCF3 and/or alcohols
Regiocontrolled Hydroarylation of (Trifluoromethyl)acetylenes in Superacids: Synthesis of CF<sub>3</sub>-Substituted 1,1-Diarylethenes
作者:Haider M. H. Alkhafaji、Dmitry S. Ryabukhin、Vasiliy M. Muzalevskiy、Aleksander V. Vasilyev、Georgy K. Fukin、Alexey V. Shastin、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201201375
日期:2013.2
trifluoromethylated vinyl cations was confirmed by DFT calculations. The stable 2,2,2-trifluoroethylated carbocation reaction intermediates were observed by 1H, 13C, and 19F NMR spectroscopy. Under treatment with aluminium bromide, the reaction of 3,3,3-trifluoro-1-phenylpropyne with benzene formed 1,3,3-triphenylindene. The hydration of aryl(trifluoromethyl) alkynes in sulfuric or trifluoroaceticacids smoothly produced