In a series of ten substituted α-(thiopyran-2-ylidene) ketones, the stable Z-form is transformed into the E-isomer upon irradiation. The photoproduct reverts to the starting material by a dark process, which obeys first-order kinetics. The rate constants for the EZ-isomerization are controlled mainly by steric factors. The activation energy for the thermal reversion is ca. 10 kcal mol–1.
C. Th. Pedersen, C. Lohse, N. Lozac'h and J. Sauvé, J. Chem. Soc., Perkin Trans. 1, 1976, 166 DOI: 10.1039/P19760000166
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