期刊
INORGANICA CHIMICA ACTA
卷 362, 期 9, 页码 3267-3273出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2009.02.034
关键词
Cobalt; Iron; Cyclopropanation; Asymmetric catalysis; Chiral terpyridine
资金
- City University of Hong Kong SRG [CityU 7002000, 7002223]
Optically pure C-1- and C-2-terpyridine ligands (L) form cobalt(II) and iron(II) complexes of formula [Co(L)Cl-2] and [Fe(L)Cl-2], respectively, and Iron(III) complexes of formulas [Fe(L)Cl-3]. Structures of three new chiral cobalt( II) and one iron(III) complexes were analysed using X-ray crystal structure analysis. These complexes were shown to be precursor of efficient catalyst for cyclopropanation. Reaction with AgOTf converted the complex to active catalyst, which gave enantioselectivities of up to 76% ee for the trans-isomers and 83% ee for the cis-isomers of styrene cyclopropanes with ethyl diazoacetate. Hammett studies showed the active species for both cobalt and iron complexes to have a non-linear relationship to sigma(p) constant. (C) 2009 Elsevier B. V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据