Studies on the Lanthanum‐Induced Pinacol Coupling of Aromatic Aldehydes and Ketones in Aqueous Media

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.

Keywords:

• Acid aqueous media
• lanthanum
• pinacol coupling
• ultrasound irradiation

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).