Racemization during the reaction of dimethyltitanium dichloride with the 2,2-disubstituted cyclopentanone (–)-(3) of high enantiomeric purity provides stereochemical evidence for a carbonium ion rearrangement during this dimethylation process.
G. H. Posner and T. P. Kogan, J. Chem. Soc., Chem. Commun., 1983, 1481 DOI: 10.1039/C39830001481
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