Hydroxylation of Phenol Catalyzed by Oxovanadium(IV) of Salen-Type Schiff Base Complexes with Hydrogen Peroxide

被引：35
|
作者：
Alsalim, Tahseen A. [2 ]
Hadi, Jabbar S. [2 ]
Al-Nasir, Einas A. [2 ]
Abbo, Hanna S. [1 ]
Titinchi, Salam J. J. [1 ]
机构：
[1] Univ Western Cape, Dept Chem, ZA-7535 Cape Town, South Africa
[2] Univ Basrah, Dept Chem, Coll Educ, Basrah, Iraq
来源：
CATALYSIS LETTERS | 2010年 / 136卷 / 3-4期
关键词：
Phenol hydroxylation; Oxovanadium(IV) complexes; Salen-type Schiff base; Catalytic activity; Selectivity; MAGNETIC-PROPERTIES; ZEOLITE-Y; VANADIUM; COPPER(II); OXIDATIONS; TRIDENTATE; CHEMISTRY; PROTEINS; IMIDES; MODEL;
D O I：
10.1007/s10562-010-0326-z
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Active and highly selective catalytic systems of oxovanadium(IV) salen-type have been prepared and characterized by various physico-chemical techniques. Substituted salen-type Schiff base ligands were prepared from 3-ethoxy salicylaldehyde with 1,2-diaminobenzene and 1,8-diaminonaphthalene abbreviated (EtOsalphen) and (EtOsalnaph), respectively. The catalytic activity of the complexes for hydroxylation of phenol to catechol and hydroquinone using H(2)O(2) as an oxidant has been studied. The best suited reaction conditions were obtained by considering the effect of solvent, concentration of substrate, reaction time, concentration of catalyst and temperature. Under the optimized reaction conditions, VO-(EtOsalphen) catalyst shows high conversion (71%) at a short reaction time (2 h) with selectivity of 92.5% towards catechol, while VO-(EtOsalnaph) complex also shows higher conversion (76.6%) after longer reaction time (6 h) with almost similar selectivity to catechol (94.2%).
引用
收藏
页码：228 / 233
页数：6
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