Mechanism of cis-to-trans one way isomerization of stilbene and formation of its stable dimer cation radicals in zeolite cavities

Cis-to-trans one way isomerization of stilbene in the first case catalyzed by proton, and then, secondly through electron transfer, occurred in acidic zeolites without light, suggesting that dimer cation radicals with charge transfer interaction between trans-stilbene and its cation radical may be formed in H-ZSM-5, whereas 1,4-dimer cation radicals of stilbene may be produced in H-mordenite.