Abstract
By using an optically active metal-carbene complex we were able to isolate an optically active cyclopropane from the reaction of diethyl fumarate with [(−) ( R)-methylphenylpropylphosphine] (phenylmethoxycarbene) tetracarbonylchromium. In addition to being synthetically useful for the preparation of cyclopropanes of optical activity, this reaction demonstrates that no free carbene is involved in the mechanism for the reaction.
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