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| - Kinetic and Mechanistic Study of the Displacement ofη2-Coordinated Arenes from Cp*Re(CO)2(η2-C6H5R) (R =H, CH3, C(CH3)3): Evidence for a Dissociative Mechanismand Estimation of the Re−(η2-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 constantsfor 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 functionof the steric and electronic properties of the arene substituents. Activation parameters yielda lower limit of 19−21 kcal/mol for the Cp*(CO)2Re−(η2-arene) bond strength.
- The displacement of the arene molecule from Cp*Re(CO)2(η2-arene) (arene = benzene, toluene, tert-butylbenzene) by pyridine is studied. The rate constant for the dissociation of arene from the Re center is found to increase in the order Cp*(CO)2Re−(η2-toluene) < Cp*(CO)2Re−(η2-benzene) ≈ Cp*(CO)2Re−(η2-tert-butylbenzene). The activation parameters yield a lower limit of 19−21 kcal/mol for the Re−(η2-arene) bond energy.
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