1, 3-Diphenylpropenylium (DP3+) and 1, 5-diphenylpentadienylium (DP5+) ions have been generated within acid ZSM-5 and mordenite zeolites as persistent species by adsorption of α, ω-disubstituted α, ω-diphenylalkanes. It was found that besides α, ω-diacetates, α, ω- dichlorides and α, ω-diols are also convenient precursors. Irradiation of these allylic cations embedded within zeolites led to cis-trans isomerization as the only observable process. ...
