Generation, ESR Spectra, and Isolation of<i>N</i>-(Arylthio)-2,4,6-triarylphenylaminyl Radicals. Influence of the Substituents on the 2,4,6-Triphenyl Groups on the Stabilities of Radicals
作者:Yozo Miura、Yuichi Kitagishi、Sadaharu Ueno
DOI:10.1246/bcsj.67.3282
日期:1994.12
Three N-(Arylthio)-2,4,6-tris(4-methylphenyl)-, three N-(arylthio)-2,4,6-tris(3-chlorophenyl)-, and five N-(arylthio)-2,4,6-tris(4-chlorophenyl)phenylaminyl radicals have been generated by PbO2 oxidation of the corresponding N-(arylthio)-2,4,6-triarylanilines and their isolation has been carried out. When electron-donating methyl groups were substituted at the p-positions of the 2,4,6-triphenyl groups
三个 N-(芳硫基)-2,4,6-三(4-甲基苯基)-、三个 N-(芳硫基)-2,4,6-三(3-氯苯基)-和五个 N-(芳硫基)- 2,4,6-三(4-氯苯基)苯胺基自由基已通过相应的 N-(芳硫基)-2,4,6-三芳基苯胺的 PbO2 氧化生成,并已进行分离。当给电子甲基被取代在 2,4,6-三苯基的对位时,氨基的稳定性较差,只有一个可以作为自由基晶体分离出来。另一方面,当氯原子在 2,4,6-三苯基的间位或对位被取代时,胺基更稳定并且大部分被分离。分离出的自由基晶体长期稳定,没有任何分解。在 ESR 参数的基础上讨论了自由基中的自旋密度分布。