Carbanions of the type [Ph2C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CHCHR]– were alkylated in liquid ammonia. A preponderance of α-alkylation occurred when R was H or Me, in accord with the principle of least motion. Contrary to predictions, exclusive α-alkylation occurred when R was Ph. The mechanism and synthetic utility of these reactions are discussed.
R. Boyce, W. S. Murphy and K. P. Klein, J. Chem. Soc., Perkin Trans. 1, 1972, 1292 DOI: 10.1039/P19720001292
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