Heterocycles as ligands. XVIII. Synthesis and structure of tricarbonyl(1,2,3,4,5-pentamethylpyrrole)chromium(0) - the effect of methylsubstitution on the coordination properties of the pyrrole ligand.
Tricarbonyl(1,2,3,4,5-pentamethyl)chromium(0) (I) is obtained from pentamethylpyrrole and tetracarbonyl(norbornadiene)chromium(0) in good yield. The mol. geometry of I calcd. from x-ray data indicates pentamethylpyrrole to be a stronger donor ligand on comparison with N-methylpyrrole in tricarbonyl(N-methylpyrrole)chromium(0). This result is confirmed by an AM1 calcn. of N-methylpyrrole and pentamethylpyrrole.
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