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Mixed ligand complexes of chromium(III) and iron(III): synthesis and evaluation as catalysts for oxidation of olefins

✍ Scribed by Prakash B. Samnani; Pabitra Krishna Bhattacharya; Pralhad A. Ganeshpure; V.J. Koshy; Sheo Satish

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 526 KB
Volume: 110
Category: Article
ISSN: 1381-1169
DOI: 10.1016/1381-1169(95)00299-5

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✦ Synopsis

The mixed ligand complexes

Cr"'(dpaXL)Cl and Fe'"(dpaXLXH,O),Cl (where dpa = dipicolinic acid, L = ethylenediamine, 2,2-bipyridine or l,lO-phenanthroline, n = 1 or 2) were synthesized and characterized by elemental analysis and spectral, magnetic, conductance and electrochemical studies. The complexes were evaluated for their activity as catalysts for the epoxidation of olefms. The chromium complexes catalyzed epoxidation of olefins, viz., norbomene, cis-cyclooctene, styrene and cyclohexene with iodosylbenzene, to give corresponding epoxides. Oxidation of cyclohexene gave allylic oxidation products besides the epoxide. The iron complexes were nearly inactive as epoxidation catalysts under these conditions. Spectrophotometric and electrochemical measurements were used to deduce the cause of low catalytic activity.

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