Pinacol coupling reaction of several aromatic dialdehydes 1a–d using inexpensive aluminum powder as a reductive reagent in aqueous NaOH–methanol media afforded dimeric compounds 2a–d as main products, in which only one carbonyl group of 1 was reduced.
D. A. Sahade, T. Kawaji, T. Sawada, S. Mataka, T. Thiemann, T. Tsukinoki and M. Tashiro, J. Chem. Res. (S), 1999, 210 DOI: 10.1039/A808468H
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