Kinetic and mechanistic study of the displacement of eta(2)-coordinated arenes from Cp*Re(CO)(2)(eta(2)-C6H5R) (R = H, CH3, C(CH3)(3)): Evidence for a dissociative mechanism and estimation of the Re-(eta(2)-arene) bond strength

Citation
Aa. Bengali et A. Leicht, Kinetic and mechanistic study of the displacement of eta(2)-coordinated arenes from Cp*Re(CO)(2)(eta(2)-C6H5R) (R = H, CH3, C(CH3)(3)): Evidence for a dissociative mechanism and estimation of the Re-(eta(2)-arene) bond strength, ORGANOMETAL, 20(7), 2001, pp. 1345-1349
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
0276-7333 → ACNP
Volume
20
Issue
7
Year of publication
2001
Pages
1345 - 1349
Database
ISI
SICI code
0276-7333(20010402)20:7<1345:KAMSOT>2.0.ZU;2-D
Abstract
The displacement of the arene molecule from Cp*Re(CO)(2)(eta (2)-arene) (ar ene = benzene, toluene, tert-butylbenzene) by pyridine in heptane solution is studied. The rate constants for arene dissociation from the Re center ar e found to vary in the order Cp*(CO)(2)Re-(eta (2)-toluene) < Cp*(CO)(2)Re- (<eta>(2)-benzene) approximate to Cp*(CO)(2)Re-(eta (2)-tert-butylbenzene) and are a function of the steric and electronic properties of the arene sub stituents. Activation parameters yield a lower limit of 19-21 kcal/mol for the Cp*(CO)(2)Re-(eta (2)-arene) bond strength.