The Beckmann rearrangement of 5‐methylthiaindan‐4‐one oximes (I) and thiaindan‐6‐one oximes (IV) proceeds with the migration of the alkyl group to yield dihydrothieno‐pyridones (II and V, respectively). In two instances, the corresponding lactones (VIIa and VIIb) also were isolated. None of the isomeric lactams (X and XI) were isolated from the Beckmann rearrangement reactions. Supporting evidence for the proposed structures is provided.
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Aparajithan et al. (1966) studied this question.
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