http://dx.doi.org/10.1016/j.ica.2009.02.034">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Cobalt and iron complexes of chiral C1- and C2-terpyridines: Synthesis, characterization and use in catalytic asymmetric cyclopropanation of styrenes

Language

English

Abstract

Optically pure C1- and C2-terpyridine ligands (L) form cobalt(II) and iron(II) complexes of formula [Co(L)Cl2] and [Fe(L)Cl2], respectively, and Iron(III) complexes of formulas [Fe(L)Cl3]. 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 σp constant. © 2009 Elsevier B.V. All rights reserved.

Keywords

Asymmetric catalysis, Chiral terpyridine, Cobalt, Cyclopropanation, Iron

Publication Date

2009

Source Publication Title

Inorganica Chimica Acta

Volume

362

Issue

9

Start Page

3267

End Page

3273

Publisher

Elsevier

ISSN (print)

00201693

This document is currently not available here.

Share

COinS