Summary
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1.
An SR group directly connected to a C=C double bond decreases the C=C frequency and evidently lowers the rigidity of this bond; at the same time it increases the frequency of the C=C triple bond. The SR group has a stronger effect than the OR group on the C=C and Cs C frequencies and on the optical parameters of the molecule.
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2.
Steric hindrance should have a smaller value in alkylvinylsulfide molecules than in vinyl ethers. The alkylvinylsulfide molecules are most likely to exist as the planar S-trans form or the nearly S-cis form.
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Shorygin, P.P., Shostakovskii, M.F., Prilezhaeva, E.N. et al. Structure and spectra of vinyl sulfides. Russ Chem Bull 10, 1468–1472 (1961). https://doi.org/10.1007/BF00906134
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DOI: https://doi.org/10.1007/BF00906134