Both η2- and η4-coordinated (vinylallene)rhodium(I) complexes can be obtained by ligand exchange with vinylallenes, depending on the substitution at the allene terminus. Vinylallenes like 1 react with CO via η4 complexes in a new RhI-catalyzed [4 + 1]cycloaddition to give cyclopentenones 2.
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Murakami et al. (1996) studied this question.
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