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• W2000304989 abstract "The kinetics and mechanism of the reaction of photogenerated (η1-bromobenzene)Cr(CO)5 (bromobenzene = PhBr), which coordinates weakly (= Lw) to Cr through a ‘dative’ Br → Cr bond, with more strongly bonding alkene ‘traps’ (Ls: 1-hexene: 1-decene: 2,4,4-trimethyl-pentene), has been studied by employing pulsed laser flash photolysis with visible and infrared detection. The kinetics data are (η1-PhBr)Cr(CO)5 → (η2-Ls)Cr(CO)5 consistent with a single mechanism, involving dissociation of PhBr from (η1-PhBr)Cr(CO)5, followed by competitive reaction of the [Cr(CO)5] intermediate thus produced with PhBr or L5. Data taken ‘neat’ to very high [Ls], and in dilute solution in the ‘inert’ solvents (S: fluorobenzene, n-heptane) agree closely, indicating that solvent effects are relatively unimportant. Relative rates of attack at [Cr(CO)6] increase in the order 1-hexene < 1-decene < 2,2,4-trimethylpentene. Carbonyl stretching spectra for (C6H5X)Cr(CO)5 complexes (X = H,F, Cl, Br) are quite similar, and indicate that these Lw all are weak σ and π bonders, but do not enable one to distinguish between ‘edge-on’ binding of the ring to the metal (H, F) from dative X → Cr bonding. However, activation parameters for complexes exhibiting the two bonding modes are diagnostic for each linkage." @default.
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• W2000304989 date "1998-01-01" @default.
• W2000304989 modified "2023-09-26" @default.
• W2000304989 title "The kinetics and mechanism of ligand exchange in photogenerated (η1-bromobenzene)Cr(CO)5/alkene systems" @default.
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• W2000304989 doi "https://doi.org/10.1016/s0020-1693(97)05550-3" @default.
• W2000304989 hasPublicationYear "1998" @default.
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