Kinetic studies arene exchange reactions

The kinetics of the exchange reaction have been studied by the use of C-tagged arenes 397-400, 403) ... 

The experiments illustrated in Eqs. (6) and (7) clearly indicate that the reaction proceeds in an irreversible and direct manner. (1) In Eq. (6), the coexistent hydroamination adduct 29 afforded neither free styrene nor crossover products, indicating that the hydroamination is an irreversible process. (2) In the reaction of 2,5-dimethylstyrene (27) with morphorine (28) in Eq. (7), an additive, Markovnikov-type adduct 31, did not isomerize to anti-Markovnikov-type adduct. (3) The kinetic study on the amination process revealed a large negative of —213 J mol s , which is similar to the value of the nitroalkene amination. The first-order rate constant of the arene exchange process is comparable to that of the amination process. (4) The conjugate addition nature was confirmed by using... 

Mechanistic studies with sulphonium salts concern decomposition kinetics in hydroxylic solvents H- H exchange of the a-protons of methyl and allyl-sulphonium salts, the relative rates of which are strongly dependent upon both solvent and micellar effects radical chain reactions of triarylsulphonium halides and sodium alkoxides, which lead to arenes, anisoles, diaryl sulphides, and aldehydes or ketones and the catalysis of hydrocarbon autoxidation by... 

---