Whereas 2-aryl-3-benzylthioinden-1-ones (Ia and b) are dealkylated by aqueous potassium hydroxide in dimethyl sulphoxide, the 2-unsubstituted analogue (Ic) undergoes self-condensation with formation of 3-benzylthio-8-phenylbenzofulvene; 2-alkyl-3-benzylthioinden-1-ones (Id and e) under similar conditions yield mixtures which include both the dealkylation product and the condensation product.
K. Buggle and D. O'Sullivan, J. Chem. Soc., Perkin Trans. 1, 1976, 818 DOI: 10.1039/P19760000818
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