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J Am Chem Soc. 2004 Jun 9;126(22):6864-5.

Efficient catalysis of Nazarov cyclization using a cationic iridium complex possessing adjacent labile coordination sites.

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  • 1Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.

Abstract

The dicationic Ir(III) complex [IrMe(CO)(dppe)(DIB)](BARF)2 having adjacent labile sites has been found to be a very effective catalyst for promoting the Nazarov cyclization of aryl vinyl and divinyl ketones. Spectroscopic evidence for a substate-catalyst complex before cyclization is presented. The efficiency of the cyclization is attributed to the electrophilicity of the Ir(III) complex and substrate activation via chelation.

PMID:
15174845
DOI:
10.1021/ja049643v
[PubMed]
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