A migration process in some sulphur-substituted cycloheptatrienes studied using saturation transfer NMR

Modified Forsen-Hoffman experiments (in the FT mode) show that, in 7-substituted cyclohepta-1,3,5-trienes benzenesulphonyl groups migrate in a random way, while phenylthio substituents show a specific 1,2-migration. Activation parameters for the migration process are given for a number of compounds.