Abstract
Sodium cyclopentadienide adds two molar equivalents of tert-butylisocyanate to yield the 1,2-bis(N-tert-butylcarbamoyl)cyclopentadienide reagent 1. This reacts with RuCl2(PPh3)4 3 in a 2∶1 stoichiometry to yield the metallocene [η5-C5H3(CONHCMe3)2]2Ru 5. Complex 5 was characterized by an X-ray crystal structure analysis. It shows a near to eclipsed C2-symmetric metallocene conformation with the carboxamide substituents pairwise connected by intramolecular hydrogen bridges between –CONHR groups attached to different Cp ligands. The intermediate of the substitution reaction sequence, the complex [η5-C5H3(CONHCMe3)2]RuCl(PPh3)2 4, was also isolated and characterized by X-ray diffraction. Treatment of 1 with FeCl2 (2∶1) yields 1,1′,2,2′-tetra(N-tert-butylcarbamoyl)ferrocene 6. The X-ray crystal structure analysis of 6 features a staggered Ci metallocene conformation.
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