The Photochemistry of Polydonor-Substituted Phthalimides: Curtin-Hammett-Type Control of Competing Reactions of Potentially Interconverting Zwitterionic Biradical Intermediates
alpha-trimethylsilylmethansulfonamide- and alpha-carboxymethansulfonamide-terminated phthalimides and naphthalimides that that contain an internal tertiaryamine donor site (D = NMe) are chemically inefficient and follow a pathway involving alpha-deprotonation at the tertiaryamine radical cation center in intermediate, iminium radical-containing, zwitterionic biradicals. In addition, the quantum efficiencies for
报告了旨在获得有关控制化学效率/区域选择性和单电子转移 (SET) 促进的受体-多供体系统反应的量子产率的因素的信息的研究结果。用双供体系链邻苯二甲酰亚胺和一般结构 N-邻苯二甲酰亚胺-和 N-萘二甲酰亚胺-CH2CH2-D-CH2CH2-NMsCH2-E(E = SiMe3 或 CO2NBu4 和 D = NMs、O、S , 和 NMe)。这些底物含有共同的末端供体基团(NMsCH2SiMe3 或 NMsCH2CO2NBu4),它们具有已知的氧化电位和阳离子自由基裂解率。通过掺入不同的杂原子和/或取代基,这些底物中其他供体位点的氧化电位和碎裂率会发生变化。照片产品分销,进行了反应量子产率和荧光量子产率测量。结果表明,α-三甲基甲硅烷基甲磺酰胺 (E = SiMe3) 和 α-羧基甲磺酰胺 (E = CO2NBu4) 封端的邻苯二甲酰亚胺和萘酰亚胺的光环化反应包含内部磺酰胺、醚和硫醚供体位点(D