Interaction between the carbonyl group and an α-sulphur atom. Part I. Infrared and ultraviolet spectra of some α-(alkylthio)thioesters

Abstract

Some α-(alkylthio)thioesters exhibit a shift of the carbonyl stretching frequency to lower frequencies in comparison with the unsubstituted thioesters, and a strong u.v. absorption maximum at ca. 285 nm, which is absent from the spectra of the unsubstituted thioesters. The similarity of the spectroscopic data for the α-(alkylthio)-ketones and -esters is discussed.