Reactions of Vinyl Type Carbocations Generated in Fluorosulfonic Acid with Benzene Derivatives. New Synthesis of Alkyl 3,3-Diarylpropenoates
作者:P. Yu. Savechenkov、A. P. Rudenko、A. V. Vasil'ev、G. K. Fukin
DOI:10.1007/s11178-005-0340-6
日期:2005.9
Vinyl type carbocations ArC+=CHX [X = CO2H, CO2Alk, C≡N, P(O)(OAlk)2] generated from alkyl 3-arylpropynoates and related compounds in fluorosulfonic acid at −75 to −20°C react with various benzene derivatives, following the mechanism of electrophilic substitution of hydrogen. A new procedure for the synthesis of alkyl 3,3-diarylpropenoates having various substituents in the aryl fragments has been developed on the basis of protonation of the triple bond in alkyl 3-arylpropynoates.
Rudenko, A. P., Russian Journal of Organic Chemistry, 1994, vol. 30, # 12, p. 1946 - 1980
作者:Rudenko, A. P.
DOI:——
日期:——
Dual Reactivity of the Formyl Cation as an Electrophile and a Broensted Acid in Superacids
作者:Matsuo Tanaka、Masahiro Fujiwara、Hisanori Ando
DOI:10.1021/jo00117a041
日期:1995.6
The nature of the formyl cation in the Gattermann-Koch formylation was studied by comparing the formylation with the acetylation and sulfonation in CF3SO3H-SbF5 and FSO3H-SbF5, respectively. The results of the kinetic studies in CF3SO3H-SbF5 showed that the formyl cation has dual reactivity as an electrophile and as a Bronsted acid. Upon comparing the formylation with the sulfonation in FSO3H-SbF5, it was found that the protonated aromatic compounds also act as Bronsted acids to produce formyl cations. Therefore, the formylation has a priority over other typical electrophilic substitutions under conditions where most of aromatic compounds are protonated because the formyl cation is reproduced close to the aromatic compounds by the protonation of CO with not only superacids but also protonated aromatic compounds.
Rudenko; Salfetnikova; Vasil'ev, Russian Journal of Organic Chemistry, 1996, vol. 32, # 10, p. 1447 - 1470
作者:Rudenko、Salfetnikova、Vasil'ev
DOI:——
日期:——
Reactions of acetylene ketones in superacids
作者:S. A. Aristov、A. V. Vasil’ev、G. K. Fukin、A. P. Rudenko
DOI:10.1134/s1070428007050107
日期:2007.5
Vinyl type cations ArC+=CHCOR generated from acetylene ketones ArC CCOR in superacids HSO3F and CF3SO3H react with diverse benzene derivatives to form alkenylation products, E-/Z-isomers of diarylpropenone structures Ar(Ar')C=CHCOR. The alkenylation of aromatic compounds with acetylene ketones in superacids occurs with the primary syn-addition of a hydrogen and an aryl residue to the acetylene bond followed by transformation of the product into anti-isomer under the conditions of the reaction.