Borohydride-enhanced dechlorination of chlorobenzenes and toluenes

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Abstract
Photolysis of chlorobenzenes and chlorotoluenes in the presence of sodium borohydride leads to a faster photochemical reaction, with enhancements of rate of up to a 100-fold. The photoproduct mixtures become less complex in the presence of sodium borohydride, predominantly forming the dechlorinated aromatic hydrocarbon in near-quantitative yield. In some cases, though not all, a chain mechanism appears operative.