C. Kashima et al., THE MAGNESIUM BROMIDE INDUCED CLAISEN CONDENSATION REACTION OF N-ACYLPYRAZOLES, Journal of heterocyclic chemistry, 32(6), 1995, pp. 1775-1777
N-Acylpyrazoles formed the 5-membered C=O...Mg...N-2 chelate complexes
with magnesium bromide which afforded the Claisen condensation produc
ts by the action of tertiary amine through the corresponding enolate.