ω-Vinylalkyl esters (3) of thioxoacetic acid, generated by retro-Diels–Alder cleavage of their cyclopentadiene cycloadducts (2), underwent Type III intramolecular ‘ene’ reactions during flash vacuum pyrolysis at 500 °C to give 3-thialactones having 6- to 11-membered rings.
S. S.-M. Choi, G. W. Kirby and M. P. Mahajan, J. Chem. Soc., Chem. Commun., 1990, 138 DOI: 10.1039/C39900000138
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