Synthesis and first X-ray structures of cobalt(II) and cobalt(III) complexes bearing 2,4-dioxo-alkanoic acid dialkylamide ligands

Authors

Brian Pagenkopf, University of Western OntarioFollow
Jian Wang
Nicholas A. Morra
Hongda Zhao
Vincent Lynch
Robert McDonald
John F. Reichwein

Document Type

Article

Publication Date

11-15-2008

Journal

Canadian Journal of Chemistry

Volume

87

Issue

1

First Page

328

Last Page

334

URL with Digital Object Identifier

10.1139/v08-151

Abstract

The aerobic oxidation of 5-hydroxy pentenes to trans-tetrahydrofurans (THFs), the Mukaiyama oxidation, has in recent years emerged as a powerful tool in synthetic chemistry. In this report we describe the first crystal structures of 2,4-dioxo-alkanoic acid dialkylamide complexes for both Co(II) and Co(III) salts. The Co(II) structures show an unprecedented arrangement of atoms, with a central Co(II)(H₂O)₆ flanked by two Co(II) atoms each coordinated with three anionic chelating ligands. The dimeric Co(III) structures show two anionic chelating ligands and bridging hydroxyl groups.