Catalysis Letters

, Volume 89, Issue 3, pp 219–227

Liquid-Phase Catalytic Hydroxylation of Phenol Using Cu(II), Ni(II) and Zn(II) Complexes of Amidate Ligand Encapsulated in Zeolite-Y as Catalysts


  • Mannar R. Maurya
    • Department of ChemistryIndian Institute of Technology Roorkee
  • Salam J. J. Titinchi
    • Department of ChemistryIndian Institute of Technology Roorkee
  • Shri Chand
    • Department of Chemical EngineeringIndian Institute of Technology Roorkee

DOI: 10.1023/A:1025706529969

Cite this article as:
Maurya, M.R., Titinchi, S.J.J. & Chand, S. Catalysis Letters (2003) 89: 219. doi:10.1023/A:1025706529969


Copper(II), nickel(II) and zinc(II) complexes of amidate ligand 1,2-bis(2-hydroxybenzamido)ethane(H2hybe) encapsulated in the super cages of zeolite-Y have been prepared and characterized by spectroscopic studies and thermal as well as X-ray diffraction (XRD) patterns. These complexes catalyze the liquid-phase hydroxylation of phenol with H2O2 to catechol as a major product and hydroquinone as a minor product. Considering the concentration of substrate and oxidant, amount of catalyst, temperature of the reaction and volume of solvent, a best-suited reaction condition has been optimized to get maximum hydroxylation. Under the optimized reaction conditions, [Cu(hybe)]-Y has shown the highest conversion of 40% after 6 h, which is followed by [Ni(hybe)]-Y with 37% conversion and [Zn(hybe)]-Y has shown the poorest performance with 33% conversion. All these catalysts are more selective towards catechol formation (∼90%), irrespective of their catalytic performance.

[MH(hybe)] complexeszeolite-encapsulated metal complexeshydroxylation of phenolcatechol and hydroquinone formation

Copyright information

© Plenum Publishing Corporation 2003