The ratio of methyl transfer (2) and reduction (3) products in the reaction of trimethoxycarbonylethylene 1 with methylcopper reagents MeCuLn varies with the copper species, and decreased in the following order: MeCu(CN)Li > MeCu > Me2Cu(CN)Li2≫ Me2CuLi > Me3CuLi2.
Y. Chounan, T. Ibuka and Y. Yamamoto, J. Chem. Soc., Chem. Commun., 1994, 2003 DOI: 10.1039/C39940002003
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