Abstract
The competitive hydrodehalogenation of isomeric o-, m- and p-dichloro (and dibromo) benzenes with H 2 at atmospheric pressure and Pd/C or NiRaney carried out in a multiphase system (organic solvent and 50% KOH aq. solution) is influenced by the presence of a bulky quaternary onium salt where both the catalytic activity and the selectivity change in relation to the halogen to be removed and the metal catalyst used. In particular, the NiRaney catalyst becomes effective in the reduction only if an onium salt is added. Similarly, the onium salt effects the catalytic hydrodehalogenation of 1,2,4-trichloro- and 1,2,4-tribromobenzene.
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