Benzylic oxidation with H2O2 catalyzed by Mn complexes of N,N′,N"-trimethyl-1,4,7-triazacyclononane:: spectroscopic investigations of the active Mn species

被引：44

作者：

Bennur, TH ^{[1
]}

Sabne, S ^{[1
]}

Deshpande, SS ^{[1
]}

Srinivas, D ^{[1
]}

Sivasanker, S ^{[1
]}

机构：

[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2002年 / 185卷 / 1-2期

关键词：

manganese complexes; Mn-tmtacn; selective oxidation; benzylic oxidation; oxidation with H2O2; ESR; spectroscopic investigations;

D O I：

10.1016/S1381-1169(02)00132-2

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：

Mn complexes of N,N',N"-trimethyl-1,4,7-triazacyclononane (Mn-tmtacn) exhibit good catalytic activity, at ambient temperatures, for the benzylic oxidation of aromatics selectively to the corresponding alcohol and carbonyl compounds with H2O2 as oxidant in the presence of carboxylate buffers. The active Mn species in the reaction medium was investigated by UV-visible (UV-Vis), FT-IR-attenuated total reflectance (FT-IR-ATR) and electron spin resonance (ESR) spectroscopic techniques. The studies revealed the formation of terminal oxo- and mu-oxo-Mn(IV)-tmtacn complexes during the reaction. The oxo-manganese complexes and the nature of the carboxylic acid play an important role in the activation of the benzylic C-H bond. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：71 / 80

页数：10

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