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Vicinal diols have been prepared in good yield by pinacol coupling reaction of aromatic aldehydes and ketones with commercially available zinc and AlCl3 · 6H2O in water.
The authors thank Dr. P. G. Rao, director, Northeast Institute of Science and Technology, for providing the necessary facilities for this work.
a The ratio of dl/meso is determined by 1H NMR.
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