Metal dimers as catalysts : III. The reaction between Fe(CO)5, and group V donor ligands in the presence of [(η5-C5H4R)Fe(CO)222]2 (R H,Me) and [(η5-C5Me5)Fe(CO)2]2 as catalyst |
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| Authors: | Michel O Albers Neil J Coville Eric Singleton |
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| Institution: | Department of Chemistry, University of the Witwatersrand, Johannesburg 2001 Republic of South Africa;National Chemical Research Laboratory, Council for Scientific and Industrial Research, Pretoria 0001 Republic of South Africa |
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| Abstract: | The reaction between Fe(CO)5, and group V donor ligands L, (L PPh3, AsPh3, SbPh3, PMePh2, PMe2Ph, Asme2Ph, P(C6H11)3, P(n-Bu)3, P(i-Bu)3, P(OPh)3, P(OEt)3, P(OMe)3) in the presence of (η5-C5Me5Fe(CO)2]2 (R H, Me) or (η5-C5Me5)Fe(CO)2]2 as catalyst in refluxing toluene, rapidly gives the complexes Fe(CO)4L in yields > 85%. The reaction rate is essentially independent of the nature of L for (η5-C5Me5)Fe(CO)2]2 as catalyst. For the other catalysts, the rate is influenced predominantly by the steric properties of L. These results are interpreted in terms of the interaction between the catalyst and the ligand L to give derivatives of the type (η5-C5H4R)2Fe2,(CO)3,(L). These derivatives were also found to catalyse the reaction between Fe(CO)5, and L. The complexes (η-C5H4R)Fe(CO)2]2 (R H, Me) and (η5-C5Me5)Fe(CO)2]2 also catalyse the reaction between Mn2(CO)10 and PPh3 to give Mn2(CO)8- PPh3)2 in > 80% yield. |
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