The gas-phase methylation of benzene and toluene

摘要: Abstract The reactions of the methyl cation with benzene and toluene in gas phase have been examined using flowing afterglow-selected ion flow-drift tube technique. With four product ions are formed, C 6 H + by electron transfer, 5 addition loss CH 4 , 7 2 an adduct 9 . Deuterium carbon-13 labeling experiments were carried out to provide mechanistic insights. In agreement earlier work, deuterium (CD 3 or D ) shows that partial H/D scrambling between group ring occurs during formation However, contrast no was observed carbons, thus ruling a expansion contraction mechanism account for scrambling. Nor did we find transfer ion, When collision-induced dissociation (CID) on extensive found, indicating at least some its formation. Reaction methane room temperature exclusively forms ion; drift field, this fragments Mechanisms proposed which our results, these supported ab initio calculations. Similar studies as neutral reagent. Besides analogous ions, found hydride from be major reaction channel ethylene minor channel.