Abstract
The pinacol coupling of aromatic aldehydes and ketones was carried out in 16–71% yield using La–36%HAc–CH2Cl2 system with stirring at rt in 4 h. The reactions in the same system gave pinacols in 12–91% yield under ultrasound irradiation at rt in 2 h.
Acknowledgments
The project was supported by Natural Science Foundation of Hebei Province (203107), Science and Technology Foundation of Hebei Province (04213041), and Science Foundation of Hebei Lang Fang Normal College (200517).