One-way photoisomerization of cis-stilbene via a cation radical chain mechanism

The photochemistry of electron donor–acceptor (EDA) complexes in micellar solutions. I. The stilbene–methylviologen system

“…When isomerization is mediated by the stilbene radical cation, the formation of tS is heavily favoured (1,5,12). The cSt is believed to undergo rapid and essentially irreversible isomerization to tSt (1,5).…”

“…These photoprocesses have been camed out, in homogeneous solution, by means of straightforward excitation (2), triplet sensitization (3,4), via radical cations (5) or exciplexes (6), and through the excitation of charge-transfer complexes formed by stilbenes and organic neutral molecules (7,8). There have been, however, very few studies in microheterogeneous media (micelles, semiconductor particles, etc.…”

Photochemical and electrochemical Z–E isomerization of 1,4-dialkoxy-2,5-bis[2-(thien-2-yl)ethenyl]benzene stereoisomers

“…Earlier studies of photoisomerization of arylethenes such as stilbenes were intensified nearly fifty years later [2,3]. The detailed description of the proposed mechanism of photoisomerization of Z-and E-stilbenes was a subject of wide reviews [4][5][6][7][8][9][10]. Stereoisomers of substituted styrenes [11,12] or azocrown ethers in form of LB films [13,14] are examples of other systems for which isomerization processes have been studied.…”

Photocatalytic oxygenation of olefins with oxygen

“…Thus, Acr + -Mes acts as a photocatalyst for the cis-trans isomerization of stilbene via the radical cation (Scheme 2). Since stilbene radical cation has low reactivity toward O 2 [35][36][37][38], the photocatalytic oxygenation of stilbene with Acr + -Mes takes place via the radical coupling between stilbene radical cation and O 2 À rather than via the reaction of stilbene radical cation with O 2 , accomapnied by the isomerization of the stilbene radical cation.…”