A study of [Co2(alkyne)(binap)(CO)4] complexes (BINAP=(1,1'-binaphthalene)-2,2'-diylbis(diphenylphosphine)) |
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| Authors: | Gibson Susan E Kaufmann Karina A C Loch Jennifer A Steed Jonathan W White Andrew J P |
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| Institution: | Department of Chemistry, Imperial College London, South Kensington, London SW7 2 AY, UK. s.gibson@imperial.ac.uk |
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| Abstract: | Understanding the interaction of chiral ligands, alkynes, and alkenes with cobaltcarbonyl sources is critical to learning more about the mechanism of the catalytic, asymmetric Pauson-Khand reaction. We have successfully characterized complexes of the type Co2(alkyne)(binap)(CO)4] (BINAP=(1,1'-binaphthalene)-2,2'-diylbis(diphenylphosphine)) and shown that diastereomer interconversion occurs under Pauson-Khand reaction conditions when alkyne=HCtriple bond]CCO2Me. Attempts to isolate Co2(alkyne)(binap)(CO)x] complexes with coordinated alkenes led to the formation of cobaltacyclopentadiene species. |
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| Keywords: | alkynes asymmetric catalysis cobalt cyclopentenone reaction mechanisms |
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