The oxidative addition of methyl iodide to β-diketonecarbonyltriphenylphosphinerhodium(I) complexes |
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| Authors: | S.S. Basson J.G. Leipoldt J.T. Nel |
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| Affiliation: | Department of Chemistry, University of the Orange Free State, Bloemfontein, South Africa |
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| Abstract: | The kinetics and mechanism of the reaction [Rh(β-diketone)(CO)(PPh3)] + CH3I → [Rh(β-diketone)(CH3)(I)(CO)(PPh3)] where β-diketone = acac, TFDMAA, TFAA and HFAA, were studied with the aid of i.r. and visible spectrophotometry. The reaction proceeds by two consecutive steps through a postulated ionic intermediate. The influence of phosphine dissociation, solvent polarity, alkyl group variation and different electronegative β-diketone substituents on the reaction rate were investigated. The rate constant for a methyl-acyl → metal-alkyl conversion (CH3 migration) was determined. |
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| Keywords: | Author to whom correspondence should be addressed. |
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