Enhanced Cram selectivity is observed via the reaction of aldehydes (1) with ‘naked’ anions (2) prepared in situ from RM and Bu4NBr, while anti-Cram selectivity results from the reaction of (1) with ‘naked’ cuprates (4) prepared in situ from R2CuLi and Bu4NBr.
Y. Yamamoto and K. Matsuoka, J. Chem. Soc., Chem. Commun., 1987, 923 DOI: 10.1039/C39870000923
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