Abstract
The reaction of the dimeric rhodium-complexes [Cp xRhCl 2] 2 (Cp x=C 5Me 5, C 5 tBu 2H 3) with silver oxalate Ag 2C 2O 4 leads to polymeric species with the formula [Cp xRh(C 2O 4)] n in high yields. These compounds react with Lewis-bases L [L=DMSO, P(OMe) 3, PPh 3, P(C 8H 17) 3] under depolymerisation to addition products of the type Cp xRh(C 2O 4)L. The solubility of these compounds depends on the ligand L. While Cp*Rh(C 2O 4)P(OMe) 3 is only soluble in polar organic solvents, Cp*Rh(C 2O 4)P(C 8H 17) 3 can be dissolved in unpolar solvents like alkanes. All these compounds are resistant against air and moisture. The structure of Cp*Rh(C 2O 4)P(OMe) 3 has been solved by X-ray analysis. UV-irradiation of Cp*Rh(C 2O 4)L (L=P(OMe) 3, PPh 3) in CHX 3 (X=Cl, Br) results in the elimination of CO 2 and in the formation of the substitution products Cp*RhX 2L.
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