J. Am. Chem. Soc., 1995, 117 (34), pp 8853–8854, Sophie Klein, Ilane Marek, Jean-Francois Poisson, Jean-F. Normant "Asymmetric carbolithiation of cinnamyl derivatives in the presence of (-)-sparteine".
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http://dx.doi.org/10.1021/ja00139a020
