Kinetic and Mechanistic Study of the Displacement of η 2 -Coordinated Arenes from Cp*Re(CO) 2 (η 2 -C 6 H 5 R) (R = H, CH 3 , C(CH 3 ) 3 ): Evidence for a Dissociative Mechanism and Estimation of the Re−(η 2 -Arene) Bond Strength
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The displacement of the arene molecule from Cp*Re(CO)2(η2-arene) (arene = benzene, toluene, tert-butylbenzene) by pyridine in heptane solution is studied. The rate constants for arene dissociation from the Re center are found to vary in the order Cp*(CO)2Re-(η2-toluene) < Cp*(CO)2Re-(η2-benzene) ≈ Cp*(CO)2Re-(η2-tert-butylbenzene) and are a function of the steric and electronic properties of the arene substituents. Activation parameters yield a lower limit of 19-21 kcal/mol for the Cp*(CO)2Re-(η2-arene) bond strength.
author list (cited authors)
Bengali, A. A., & Leicht, A.