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Australian Journal of Chemistry Australian Journal of Chemistry Society
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RESEARCH ARTICLE

Reactions of 2,5-Dihydrothiophen and S-substituted derivatives with bases. Preparations of 1-(Alkylthio)buta-1,3-dienes and the corresponding sulfoxides and sulfones

RL Crumbie and DD Ridley

Australian Journal of Chemistry 34(5) 1017 - 1026
Published: 1981

Abstract

Under certain conditions the anions from 2,5-dihydrothiophen 1-oxide and 2,5-dihydrothiophen 1,l-dioxide undergo ring-opening reactions and the resulting buta-1,3-dienylsulfenate and buta-1,3- dienylsulfinate ions respectively may be alkylated. The anion from 2,5-dihydrothiophen also rearranges to the buta-1,3-dienylthiolate ion which may be alkylated, but the overall reaction is incomplete and pure products cannot be isolated; instead 1-(alkylthio)buta-1,3-dienes may conveniently be prepared by base-catalysed ring-opening reactions of 1-alkyl-2,5-dihydrothiophenium salts.

The 1-(alkylthio), 1-(alkylsulfinyl)- and 1-(alkylsulfonyl)buta-1,3-dienes isolated from the above reactions are very unstable, and rapidly polymerize on standing at ambient temperatures.

https://doi.org/10.1071/CH9811017

© CSIRO 1981

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