Photooxygenation and photodimerization of 4-methoxystyrene in NaY. The role of co-adsorbed water and alkene–oxygen charge-transfer complex
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- Matsubara, C. & Kojima, M. Research on Chemical Intermediates (2001) 27: 975. doi:10.1163/156856701753536705
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On adsorption into NaY, 36% of 4-methoxystyrene (1) was consumed to yield its cis- and trans- chain dimers 2. Irradiation of the NaY sample under vacuum gave cyclic dimers 3, probably through the excimer of 1, and also caused trans-to-cis one-way isomerization of 2. When the NaY sample was irradiated under dry oxygen, 4-methoxybenzaldehyde (4) was given as the major product through photoinduced electron-transfer reaction on excitation of the contact charge-transfer complexes between the guest molecules and O2. The effects of sodium ion and co-adsorbed water on the photodimerization and photooxygenation is also discussed.