125868-06-6Relevant articles and documents
Synthesis of cationic dibenzosemibullvalene-based phase-transfer catalysts by di-π-methane rearrangements of pyrrolinium-annelated dibenzobarrelene derivatives
Ihmels, Heiko,Luo, Jia
, p. 119 - 126 (2011)
Dibenzobarrelene derivatives, that are annelated with a pyrrolinium unit [N,N-dialkyl-3,4-(9′,10′-dihydro-9′,10′-anthraceno-3- pyrrolinium) derivatives], undergo a photo-induced di-π-methane rearrangement upon triplet sensitization to give the corresponding cationic dibenzosemibullvalene derivatives [N,N-dialkyl-3,4-{8c,8e-(4b,8b- dihydrodibenzo[a,f]cyclopropa[cd]pentaleno)}-pyrrolidinium derivatives]. Whereas the covalent attachment of a benzophenone functionality to the pyrrolinium nitrogen atom did not result in an internal triplet sensitization, the introduction of a benzophenone unit as part of the counter ion enables the di-π-methane rearrangement of the dibenzobarrelene derivative in the solid-state. Preliminary experiments indicate that a cationic pyrrolidinium-annelated dibenzosemibullvalene may act as phase-transfer catalyst in alkylation reactions.
Activity of: N, N ′-dialkyl-2-trifluoromethylthioimidazolium salts as phase-transfer catalyst for the alkylation of active methylene compounds
Mizuta, Satoshi,Kitamura, Kanami,Nishi, Kodai,Hashimoto, Ryo,Usui, Toshiya,Chiba, Kenya
, p. 43159 - 43162 (2016/05/24)
We herein report the synthesis of N,N′-dialkyl-2-trifluoromethylthioimidazolium salts from thioureas using nucleophilic trifluoromethylating reagents. The activity of imidazolium salts as phase-transfer catalysts under solid-liquid phase conditions was in
Organocatalytic enantioselective protonation of silyl enolates mediated by cinchona alkaloids and a latent source of HF
Poisson, Thomas,Dalla, Vincent,Marsais, Francis,Dupas, Georges,Oudeyer, Sylvain,Levacher, Vincent
, p. 7090 - 7093 (2008/09/17)
Hidden benefits: The enantioselective organocatalytic protonation of silyl enolates has been achieved by using readily available cinchona alkaloid catalysts (1) and a latent source of HF that delivers "at will" the active catalytic hydrogen fluoride salt
