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The catalyst, [Rh(S,S-Me-duphos)(acetone) 2 ] + , rapidly and efficiently converts 4-substituted pent-4-enals bearing primary and secondary substituents to the corresponding cyclopentanones and for a variety of substituents the ee was found to range from 93 to 96% at 25 °C.
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Barnhart et al. (1997) studied this question.
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