Conjugative and inductive effects in the ring opening of 1-aryl substituted oxiranes. Some reactions of 1-(p-methoxyphenyl)- and 1-(m-methoxyphenyl)-1,2-epoxycyclohexanes under acidic conditions
作者:A. Balsamo、P. Crotti、B. Macchia、F. Macchia
DOI:10.1016/0040-4020(73)80162-0
日期:1973.1
The reactions of 1-(p-methoxyphenyl)- and 1-(m-methoxyphenyl)-1,2-epoxycyclohexanes with trichloroacetic acid in benzene and with dilute sulphuric acid have been studied and compared with those of the parent compound, 1-phenyl-1,2-epoxycyclohexane. Both the steric course of the ring opening and the amounts of rearrangement products are strictly related to the effect of the substituent in the phenyl
A Pd-catalyzedasymmetricallylicalkylation of 2-substituted cycloalkenyl carbonates using a chiral diaminophosphine oxide is described. Asymmetricallylic substitution of various cyclicsubstrates proceeded using 5 mol % of Pd catalyst, 10 mol % of (S,RP)-Ph-DIAPHOX 1, 10 mol % of LiOAc, and N,O-bis(trimethylsilyl)acetamide (BSA), to afford the corresponding products in excellent yields with up to