The pinacol coupling reaction of aromatic aldehydes and ketones was performed in 8–95% yield with magnesium in 0.1 M aqueous NH 4 Cl under ultrasound irradiation at rt for 3 h. ... The pinacol coupling reaction of aromatic aldehydes and ketones was performed in 8–95% yield with magnesium in 0.1 M aqueous NH 4 Cl under ultrasound irradiation at rt for 3 h. ... View all references and Mg[7]7. Zhang , WC and Li , CJ 1999. J. Org. Chem., 64: 3230 [CrossRef], [PubMed], [Web ...