Abstract
Reaction of 1,2-bis(triphenylphosphino)ethane (diphos) with h 6-arenetricarbonylchromium(0) complexes results in replacement of one CO by diphos to give h 6-arene(diphos)dicarbonylchromium(0) (e.g., complex 4) and μ-diphosbis( h 6-arene)tetracarbonyldichromium(0). Comparison of rate of arene exchange for h 6-benzenetricarbonylchromium, h 6-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 h 4-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.
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