K. Fuji et al., ENHANCED REACTIVITY OF ZINC ENOLATES OVER LITHIUM ENOLATES IN ASYMMETRIC NITROOLEFINATION, Chemical and Pharmaceutical Bulletin, 42(4), 1994, pp. 999-1001
Zinc enolates derived from an ester and a lactone, 1 and 4, were found
to have enhanced reactivity over the corresponding lithium enolates i
n asymmetric nitroolefination,