86336-26-7Relevant academic research and scientific papers
Pyrylium Salts as Photosensitizers in Homogeneous and Heterogeneous Electron-Transfer Catalysis. - A Comparison with Cyano Arenes
Mattay, Jochen,Vondenhof, Martin,Denig, Richard
, p. 951 - 958 (2007/10/02)
Two new triphenylpyrylium salts, both being fixed to a polymeric backbone, have been synthesized.They are sensitizers for photochemically induced electron-transfer reactions, offering the possibility of heterogeneous charge transfer.Their usability in electron-transfer-catalyzed dimerizations and mixed cycloadditions of 1,3-cyclohexadiene and phenyl vinyl ether has been tested in comparison to other common photosensitizers such as 9,10-dicyanoanthracene and 1,4-dicyanonaphthalene.In addition, 2,4,6-triphenylpyrylium tetrafluoroborate was shown to operate as an efficient sensitizer for the dimerization and the photooxygenation of 1,1-diphenylethene.Diverse selectivities in the product formation indicate different mechanisms and are discussed in view of earlier results reported in the literature. - Key Words: Electron-transfer photocatalysis / Electron transfer, photoinduced / Photooxygenation / Pyrylium salts, polymeric / Radical cation cycloadditions
