Summary
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1.
It has been shown spectroscopically that rotational isomerism at the C-P bond and geometric isomerism at the carbon double bond occur in l-alkylthio-2-oxydichlorophosphine-, 1-alkylthio-2-oxydialkoxyphosphineand l-alkoxy-2-dialkyloxyphosphine-3-chlorobutadienes-l,3.
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2.
In all of the compounds investigated, there is a conjugated system of double carbon-carbon bonds and the grouping -CC1=CH2.
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3.
The frequencies of the double bonds are reduced considerably because of the conjugation of the π-bonds, the diene grouping, and the P=O bond in the molcule. The RS group has a stronger effect on the frequency of the multiple bonds than does the RO group.
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Guseinov, I.I., Lapatin, B.V., Vasil'ev, G.S. et al. Spectra and structure of 1,2,3-phosphorus-containing heterosubstituted 1,3-Butadienes. Russ Chem Bull 11, 1467–1470 (1962). https://doi.org/10.1007/BF00907217
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DOI: https://doi.org/10.1007/BF00907217