The intermediate metallacycle 1 was isolated from the reaction of the corresponding (η3-allyl)-palladium complex with deprotonated isobutyronitrile in THF/TMEDA (TMEDA = N,N,N′,N′-tetramethylethylenediamine). When CO was passed over a solution of 1 in dichloromethane at room temperature, the compound underwent spontaneous, stereoselective reductive elimination to form the corresponding cyclopropane.
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Hoffmann et al. (1995) studied this question.
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