Zirconium phosphonates-supported chiral Mn (III) Salen complexes for the asymmetric epoxidation of unfunctionalized olefins

被引：25

作者：

Xu, Zheng ^{[1
]}

Ma, Xuebing ^{[1
]}

Ma, Yueyue ^{[1
]}

Wang, Qiang ^{[1
]}

Zhou, Jinqin ^{[1
]}

机构：

[1] Southwest Univ, Coll Chem & Chem Engn, Chongqing 400715, Peoples R China

来源：

CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 08期

关键词：

Heterogeneous catalysis; Enantioselective epoxidation; Zirconium phosphonate; Unfunctional olefin; Mn (III) Salen complex; ENANTIOSELECTIVE EPOXIDATION; MESOPOROUS MATERIALS; CRYSTAL-STRUCTURE; ION-EXCHANGE; CATALYSTS; ALKENES; PHOSPHATES; SOLIDS; LIGAND;

D O I：

10.1016/j.catcom.2009.02.002

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：

The mesoporous zirconium phosphonates-supported Mn (III) Salen complexes (1a-e) with the different lengths of alkylsulfonic linkage (n = 2-6) and the loading amount of 0.041-0.059 mmol g (1) (based on Mn) were prepared and used as heterogeneous catalysts in the asymmetric epoxidation of styrene, alpha-methylstyrene and indene. The ee values significantly increased with the linkage length (n) from 2 to 6 only in the case of indene with the m-CPBA/NMO as an oxidant system, in all other shown cases the ee values are not significantly influenced by the linkage length (n). In m-CPBA/NMO system, the comparable ee values to the homogeneous Mn (III) Salen complex 1 were achieved. Due to the confined effect originating from the nanopores of zirconium phosphonates, the heterogeneous Mn (III) Salen complexes (1a-e) gave twice (84-88%ee) as many as ee values of homogeneous Mn (III) Salen complex 1 (49%ee) in the NaClO/PPNO system. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1261 / 1266

页数：6

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