Abstract
1. The NMR-13C spectra of a number of vinyl alkyl sulfides was studied. An analysis of the chemical shifts of the carbons of the multiple bond gives unambiguous evidence that weak p-π conjugation of the heteroatom with the multiple bond, the intensity of which is three times lower than in vinyl alkyl ethers, operates in these compounds. 2. The chemical shifts of13Cβ in the series of vinyl alkyl sulfides and ethers show that in both cases the degree of p-π conjugation is determined by the steric inhibition of resonance, which is more pronounced in the series of sulfides.
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