NMR spectroscopic study of the effects of conjugation. 3. Carbon-13 NMR spectra of alkyl phenyl sulfides and ethers

Abstract

Ring13C NMR data for RXPh (R = C1-C10 n-alkyl, cyclopropyl, cyclohexyl, Me2CH, EtCHMe, Me3C; X = O, S, CH2) were given. The p-p conjugation of the S with the ring was more effective when X = O than when X = S and was detd. by steric inhibition of resonance. A linear correlation of chem. shifts with steric consts. (E3) was described.