Thiobenzophenones 1 and 3 bearing an allylic group attached via an o-poly(methyleneoxy), (CH2)nO, (n= 0 and 2) bridge underwent thermal Type III intramolecularene reactions giving 8- and 10-membered cyclic sulphides 6 and 7 with newly formed cis double bonds. In contrast, with n= 1,3 or 5 or with related N,N-dimethylthioarylamides no ene products were observed.
T. Saito, T. Watanabe, S. Kitazawa, Y. Hayashi and S. Motoki, J. Chem. Soc., Perkin Trans. 1, 1991, 959 DOI: 10.1039/P19910000959
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