A twofer: The title reaction sequence for cyclopropenes allows the preparation of aldehydes bearing α-quaternary stereocenters in a one pot-reaction from readily available starting materials. Through a diastereodivergent carbometalation reaction, both enantiomers of the corresponding aldehyde were obtained from the same cyclopropene derivative (see scheme).
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Delaye et al. (2013) studied this question.
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