Efficient catalysis of Nazarov cyclization using a cationic iridium complex possessing adjacent labile coordination sites |
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| Authors: | Janka Mesfin He Wei Frontier Alison J Eisenberg Richard |
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| Institution: | Department of Chemistry, University of Rochester, Rochester, New York 14627, USA. |
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| 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. |
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