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Title: Catalytic activity of chromium(III), iron(III) and bismuth(III) complexes of 1,2-bis(2-hydroxybenzamido)ethane (H2hybe) encapsulated in zeolite-Y for liquid phase hydroxylation of phenol
Authors: Maurya, Mannar Ram
Titinchi S.J.J.
Chand S.
Published in: Journal of Molecular Catalysis A: Chemical
Abstract: Iron(III), chromium(III) and bismuth(III) complexes of amidate ligand 1,2-bis(2-hydroxybenzamido)ethane (H2hybe) encapsulated in the super cages of zeolite-Y have been isolated and characterized by various physico-chemical measurements. 3D model structure generated for [Fe(hybe)·2H2O]+ suggests that zeolite-Y can accommodate these complexes in its super cages without any strain. These encapsulated complexes catalyze hydroxylation of phenol using H 2O2 as oxidant to give catechol as a major and hydroquinone as a minor product. A suitable reaction condition has been optimized for [Fe(hybe)·2H2O]Cl-Y by considering the effect of various parameters such as concentration of substrate, amount of oxidant and catalysts, reaction time, temperature, and volume of solvent for the maximum hydroxylation of phenol. The results obtained over these new encapsulated catalysts showed that selectivity of the catechol formation is ca. 85%, though transformation of phenol varied in the order [Fe(hybe)·2H 2O]Cl-Y (43.5%)>[Cr(hybe)·2H2O]Cl-Y (32.8%)>[Bi(hybe)·2H2O]Cl-Y (30.6%). Catalytic performance of these catalysts has been compared with different metal complexes encapsulated in zeolite-Y. © 2004 Elsevier B.V. All rights reserved.
Citation: Journal of Molecular Catalysis A: Chemical, 214(2): 257-264
Issue Date: 2004
Keywords: Amidate ligand
Catechol and hydroquinone formation
Oxidation of phenol
ISSN: 13811169
Author Scopus IDs: 7005255411
Author Affiliations: Maurya, M.R., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247667, India
Titinchi, S.J.J., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247667, India
Chand, S., Department of Chemical Engineering, Indian Inst. of Technology Roorkee, Roorkee 247667, India
Funding Details: Authors are thankful to Prof. R.C. Maurya, Department of Chemistry, R.D. University, Jabalpur, for providing model structure and other calculations appearing in this paper. SJJT is thankful to the Indian Council of Cultural Relations (ICCR), New Delhi for fellowship. Indian Council for Cultural Relations, ICCR
Corresponding Author: Maurya, M.R.; Department of Chemistry, , Roorkee 247667, India; email:
Appears in Collections:Journal Publications [CY]

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