Pinacol coupling of aromatic aldehydes and ketones mediated by TiCl4-Zn in ethyl acetate under ultrasound

摘要

Zinc powder can reduce titanium tetrachloride to the corresponding low valent titanium complexes,which can promote coupling of some aromatic aldehydes and ketones to the corresponding pinacols in 35-99% yield in ethyl acetate at 20-25°C within 20-45 min under ultrasound irradiation.