Structure and reactivity of C7H7+ ions from the decay of tritiated toluenes. 1. Reactions of free tolyl ions with methanol in the gas and liquid phases
Labeled tolyl cations from the decay of ring-multitritiated toluene have been allowed to react with methanol in the liquid and the gasphases, at pressures ranging from 6 to 100 torr, yielding methyl tolyl ethers as the major products, without appreciable formation of benzyl methyl ether. The isomeric composition of the products from the gaseous systems depends on the pressure, the percentage of o-tolyl
Time-Resolved Photodissociation Rates and Kinetic Modeling for Unimolecular Dissociations of Iodotoluene Ions
作者:Chuan Yuan Lin、Robert C. Dunbar
DOI:10.1021/j100056a001
日期:1994.2
Time-resoived photodissociation rate measurements are reported for the unimolecular dissociation of the three iodotoluene ion isomers at two values of internal energy (2.54 and 2.67 eV). For the para isomer, the rate constants are in agreement with previous experimental information. The meta isomer is roughly similar to para, but the ortho isomer dissociates roughly 5 times faster at the same internal energies. These new data, along with prior results, are fitted into a comprehensive two-channel model of the dissociation kinetics, assuming competitive dissociation to form tolyl ions, and either benzyl or tropylium ions. Activation energies and entropies are assigned to both, dissociation channels for each isomer. This two-channel model accounts satisfactorily for most of the experimental information available about these dissociation processes, and possible explanations are advanced to explain discrepant data.