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Vaska’s complex [IrCl(CO)(PPh3)2] efficiently catalyzes the intramolecular carbonylative [2+2+1] cycloaddition of allenynes. A dimethyl substituent on the allene terminus and a low partial pressure of carbon monoxide realize the selective engagement of the internal π-bond of allene.
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Shibata et al. (2003) studied this question.
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