Otto Koch

Übergangsmetall-Fulven-Komplexe

Abstract The structure of tricarbonyl(4,6,8-trimethylazulene)chromium has been determined by 13 C NMR studies and by a single-crystal X-ray analysis. The 13 C NMR data of the azulene complexes are compared with those of tricarbonyl(6-dimethylaminofulvene)chromium, tricarbonyl(6,6-diphenylfulvene)chromium, and those of the non-coordinated ligands 4,6,8-trimethylazulene, 6-dimethylaminofulvene 6,6-diphenylfulvene. This investigation shows that the azulene ligand is coordinated to the Cr(CO) 3 group only via the five-membered ring. This is confirmed by the X-ray analysis. The compound crystallizes in the monoclinic space group P 2 1 / a with lattice constants a 1393.7(7), b 1489.6(7), c 2757.8(13) pm; β 102.58(2)°; Z = 16. The final R index for 2535 observed reflections ( F > 3 σ) is 0.054.

Übergangsmetall-fulven-komplexe: XXIX. Benzofulven-komplexe des chroms und eisens☆

Abstract The reaction of 1,2-benzofulvenes with (CH3CN)3(Cr(CO)3 gives the (η6-1,2-benzofulvene)tricarbonylchromium complexes. In the case of 6-phenyl-1,2-benzofulvene two isomers can be isolated, in which the ligand is coordinated either via the benzo ring or the fulvene system. Analogous reactions of 1,2,3,4-dibenzofulvenes with (CH3CN)3Cr(CO)3 yield exclusively the benzo-coordinated isomers. The reaction of 6,6-dimethyl-1,2-benzofulvene with Fe2(CO)9 gives μ-(1–5-η5: 6-η1-6,6-dimethyl-1,2-benzofulvene)hexacarbonyldiiron(Fe-Fe) which has been characterized by an X-ray structure analysis.