Abstract
Liquid phase hydroxylation of phenol with H2O2to a mixture of catechol and hydroquinone in acetonitrile has been reported using dioxovanadium(V) Schiff base complexes encapsulated in zeolite-Y as catalysts. The Schiff bases used are derived from salicylaldehyde and isonicotinic acid hydrazide (H2sal-inh) or o-aminophenol (H2sal-oap). A best-suited reaction condition has been optimized for both the catalysts by considering concentration of the oxidant, amount of catalyst and temperature. Under the optimized reaction conditions, catalytic ability of both the catalysts is comparable and has shown the highest conversion of about 27% after 6 h of reaction time. Both the catalysts are more selective towards catechol formation where NH4[VO2(sal-inh)] gives 84.6% selectively while NH4[VO2(sal-oap)] gives 77% selectivity.
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