Kinetic studies on the thermal decomposition of 2, 2-dichloro-3-(9-fluorenylidene) thiirane in 12 solvents have been investigated in detail. A two-term rate equation has been derived to account for the overall rate changes. Both a uni-and bimolecular ionic mechanism involving the concatenation of sulfur atoms is proposed to account for the observed kinetic behavior. Activation parameters were calculated and rationalized with respect to differences in ...