Abstract
Pinacol coupling of aromatic aldehydes by Zn powder in aqueous H2NSO3H or H3PO4 under ultrasound irradiation can lead to the corresponding pinacols in 14–88% yields.
Acknowledgments
This project was supported by Educational Ministry of China, Educational Department of Hebei Province (2001104) and Natural Science Foundation of Hebei Province, China (203107).