Reaction of 1,2-bis(triphenylphosphino)ethane (diphos) with h6-arenetricarbonylchromium(0) complexes results in replacement of one CO by diphos to give h6-arene(diphos)dicarbonylchromium(0) (e.g., complex 4) and μ-diphosbis(h6-arene)tetracarbonyldichromium(0). Comparison of rate of arene exchange for h6-benzenetricarbonylchromium, h6-benzene(triphenylphosphine)dicarbonylchromium, and complex 4 showed that: (1) replacement of CO by a phosphine retards arene exchange and (2) the effect of diphos in stabilizing an h4-benzene ligand in complex 4 is not sufficient to allow rapid arene exchange. Nucleophilic substitution for hydrogen was observed for the first time in a phosphine-substituted arene-chromium complex.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry