The proton magnetic resonance spectra of various sulfur derivatives of long-chain carboxylic acids have been studied The types of compounds studied include those where the methylene chain is interrupted by a sulfide or a sulfone group and those where the carboxyl group has been replaced by –SO3– or –C(= O)S–. The spectral effects produced by the sulfur-containing groups are discussed. The effect of the sulfur group in sulfides and sulfones is compared with the effect of an oxygen atom in a similar environment. The effect of the –SO3– and –C(= O)S– groups on neighboring methylene groups is compared with the effect of the carboxyl group.
J. M. Purcell and H. Susi, "Proton Magnetic Resonance Spectra of Some Organosulfur Compounds," Appl. Spectrosc. 19, 105-109 (1965)