Addition of sodium derivatives of allyl alcohols (2) to phenylthioacetylene (1) forms adducts (3) which on oxidation and pyrolysis undergo Claisen rearrangement and elimination of benzenesulphenic acid to yield the 2,4-dienals (6).
R. C. Cookson and R. Gopalan, J. Chem. Soc., Chem. Commun., 1978, 924 DOI: 10.1039/C39780000924
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