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Oxovanadium(IV) Schiff Base Complexes Encapsulated in Zeolite-Y as Catalysts for the Liquid-Phase Hydroxylation of Phenol

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Abstract

Liquid-phase hydroxylation of phenol with H2O2 to a mixture of catechol and hydroquinone in acetonitrile has been reported using oxovanadium(IV) Schiff base complexes encapsulated in zeolite-Y as catalysts. Reaction conditions have been optimized by considering the concentration of substrate and oxidant, amount of catalyst, volume of solvent and temperature. Under the optimized reaction conditions, [VO(sal-1,3-pn)]-Y (H2sal-1,3-pn = N,N'-bis(salicylidene)propane-1,3-diamine) has shown the highest conversion of 34.3% after 6 h, [VO(salen)]-Y (H2salen = N,N'-bis(salicylidene)ethane-1,2-diamine) and [VO(saldien)]-Y (H2saldien = N,N'-bis(salicylidene)- diethylenetriamine) have comparable catalytic activity (∼33% conversion) while [VO(sal-1,2-pn)]-Y (H2sal-1,2-pn = N,N'-bis(salicylidene)propane-1,2-diamine) has the poorest performance (10.6% conversion). All these catalysts are more selective (90%) toward catechol formation except [VO(sal-1,3-pn)]-Y, which only gives ∼68% selectivity.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India

    Mannar R. Maurya, Maneesh Kumar & Salam J.J. Titinchi

  2. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India

    Hanna S. Abbo & Shri Chand

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  1. Mannar R. Maurya
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  2. Maneesh Kumar
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  3. Salam J.J. Titinchi
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  4. Hanna S. Abbo
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  5. Shri Chand
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Correspondence to Mannar R. Maurya.

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Maurya, M.R., Kumar, M., Titinchi, S.J. et al. Oxovanadium(IV) Schiff Base Complexes Encapsulated in Zeolite-Y as Catalysts for the Liquid-Phase Hydroxylation of Phenol. Catalysis Letters 86, 97–105 (2003). https://doi.org/10.1023/A:1022619310956

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  • DOI: https://doi.org/10.1023/A:1022619310956

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