Methyleneketenes 2 and imidoylketenes 4, generated from Meldrum's acid derivatives 1 and 2,3-dihydropyrrole-2,3-diones 3, respectively, both rearrange thermally to oxoketenimines 5; the imidoylketene–oxoketenimine rearrangement is reversible and much accelerated by electropositive migrating groups (SMe).
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Kappe et al. (1992) studied this question.
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