Rate data for reactions of (dipy)Cr(CO)4 (dipy = 2,2'dipyridyl) with alkyl phosphites (L) (dipy)Cr(CO)4 + L -* cis-(dipy )Cr(CO) 3 (L) + CO (1) have been reported to obey a rate law -d [(dipy)Cr(CO)4]/d tfc[(dipy)Cr(CO)4](2)for which mechanism 3, in which rate-determining fission of(3) a Cr-C bond is followed by rapid reaction of L with the resulting five-coordinate activated complex or intermediate, was proposed.1 It was observed, however, that the first-order rate constants, k, varied with the identity of L, a result inconsistent with the proposed mechanism. Recently, an explanation was offered2 for a similar variation in k for analogous reactions of (dipy)Mo(CO)4 and (dipy)W(CO)4 with phosphites.3 However, that explanation was predicated on an interpretation of the nature of a ligand-dependent term which is observed in the rate law for reactions of those complexes;
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