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A rhodium(I)–N-heterocyclic carbene complex achieved a high-yield decarbonylation reaction of cyclobutanones to selectively afford cyclopropanes. With this catalyst, a cyclobutanone having an aldehyde moiety underwent chemoselective decarbonylation of the ketonic carbonyl group with the aldehydic carbonyl group left intact.
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Matsuda et al. (2006) studied this question.
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