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The Rh(I)-catalyzed intramolecular hydroacylation of cis and trans asymmetrically substituted alkylidenecyclobutanes proceeds according to three mechanistic pathways. As shown by deuterium-labeling experiments, the mechanism accounting for the rearrangement of the cis isomers includes the cleavage of three carbon-carbon bonds and a remarkable transannular 3-exo-trig carbometalation.
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Aïssa et al. (2013) studied this question.
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