Die A‐Gerüst‐Komplexe (II) werden ausgehend vom zweikernigen trans‐Komplex (I) durch direkte Umsetzung mit entsprechenden Pyrazolen oder Indazol in Gegenwart von KOH als Chloride oder durch analoge Umsetzung nach erfolgter Eliminierung der Chlorid‐Liganden aus (I) als Perchlorate sowie durch Metathese mit NaBPh4 als Tetraphenylborate dargestellt.
ChemInform Abstract The CO groups of the pyrazolate-and diphosphine-bridged Rh2 complex (I) are gradually substituted by the isocyanides (II) according to the scheme. The initially obtained mono-and disubstitution products (III) and (V) contain bridging ketonic carbonyls as spectroscopic studies confirm. Thermal decarbonylations result in the formation of the Rh2 complexes with Rh-Rh bond. The reactivity of the bis(diphenylarsino)methane analogue of (I) with isocyanides is studied for comparison. The structure of the title complex, the tetrafluoroborate salt of (VI) (R: tBu), (space group P21/n, Z=4) is determined by X-ray analysis.
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