Nuclear magnetic resonance spectroscopy of diphenylallyl carbanions. Part II. Conformational studies

Abstract

A study of the ¹H n.m.r. spectra of three diphenylallyl carbanions in the range 30 to –60 °C has revealed the occurrence of rotational processes. The 1,3-diphenylallyl and 1-methyl-1,3-diphenylallyl carbanions exhibit hindered rotation of the phenyl groups, whilst the 2-methyl-1,3-diphenylallyl carbanion additionally shows hindered rotation about the C–C bonds of the allyl system.