Selective Markovnikov's addition of trifluoroacetic acid to alkenes using vanadium(V) oxide
作者:B. M. Choudary、P. N. Reddy
DOI:10.1039/c39930000405
日期:——
A simple and efficient method for trifluoroacetoxylation of alkenes using catalytic amounts of V2O5 in trifluoroacetic acid to give the Markovnikov's product selectively in excellent yields for the first time is described.
描述了一种简单有效的烯烃三氟乙酰氧基化方法,该方法首次使用了催化量的三氟乙酸中的V 2 O 5,从而有选择地以优异的收率选择性地产生了马尔可夫尼科夫产物。
Halide assisted addition of hydrogen halides to alkenes
作者:Hilton M. Weiss、Kim M. Touchette
DOI:10.1039/a703570e
日期:——
The addition of 0.1 M quaternary ammonium halide to a solution of 20% trifluoroacetic acid in methylene chloride causes a large rate increase in the reaction of simple alkenes leading to a mixture of alkyl halides and trifluoroacetates. The mechanism is proposed to involve a halide assisted protonation of the alkene which produces a carbocation intermediate sandwiched between the attacking halide ion