Abstract
The optimization of magnesium as well as Al–KOH mediated pinacol coupling of benzaldehyde is described. Exchange of the magnesium turnings for magnesium powder permitted the use of a significantly lower excess of magnesium and shortened the reaction time, while the conversion of starting material as well as the yields of products were preserved. Ultrasound had a beneficial effect on the reaction using magnesium. Using water instead of methanol as the reaction medium for Al–KOH mediated reactions resulted in raising the yields. The lowering of the Al∶KOH ratio was also possible.
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