RADICAL IONS AND PHOTOCHEMICAL CHARGE-TRANSFER PHENOMENA .23. PYRYLIUM-SALTS AS PHOTOSENSITIZERS IN HOMOGENEOUS AND HETEROGENEOUS ELECTRON-TRANSFER CATALYSIS - A COMPARISON WITH CYANO ARENES
RADICAL IONS AND PHOTOCHEMICAL CHARGE-TRANSFER PHENOMENA .23. PYRYLIUM-SALTS AS PHOTOSENSITIZERS IN HOMOGENEOUS AND HETEROGENEOUS ELECTRON-TRANSFER CATALYSIS - A COMPARISON WITH CYANO ARENES
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DOI：
10.1002/cber.19891220526
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发表时间：
1989-05-01
期刊：
影响因子：
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通讯作者：
DENIG, R
中科院分区：
文献类型：
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作者：
MATTAY, J;VONDENHOF, M;DENIG, R
合成了两种新的固定在聚合物主链上的三苯基吡喃盐。它们是光化学诱导电子转移的增敏剂。反应，提供异质电荷转移的可能性。它们在1，3-环己二烯和苯基乙烯基醚的电子转移催化二聚和混合环加成中的可用性已被测试，并与其他常见的光敏剂如9，10-二氰基蒽和1，4-二氰基萘进行了比较。此外，2，4，6-三苯基吡喃四氟硼酸盐被证明是一种有效的敏化剂，用于1，1-二苯基乙烯的二聚和光氧化。不同的选择性的产品形成表明不同的机制，并在文献中报道的早期结果进行了讨论。
Two new triphenylpyrylium salts, both being fixed to a polymeric backbone, have been synthesized. They a 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 products formation indicate different mechanisms and are discussed in view of earlier results reported in the literature.