Photochromic spin traps. Part IV. 3,3-Diphenyl-5-[2-(N-tert-butylethanalnitrone)]-[3H]-naphtho[2,1-b]pyran
作者:Angelo Alberti、Myl�ne Campredon、G�rard Giusti、Barbara Luccioni-Houz�、Dante Macciantelli
DOI:10.1002/1097-458x(200009)38:9<775::aid-mrc730>3.0.co;2-i
日期:2000.9
was synthesized and ESR studies proved its ability to act as a spin trapping agent. Although in general the aminoxyls formed in the trapping process did not exhibit any evidence of opening of the heterocyclic ring, both the closed and open forms have been observed for the spin adduct of the methyl radical. The rate constant for ring closure, i.e. the conversion of the latter isomer into the former upon
合成了标题化合物,一种具有光致变色特性的色烯系列的硝酮,ESR 研究证明了其作为自旋捕获剂的能力。虽然通常在捕获过程中形成的氨氧基没有表现出任何杂环开环的迹象,但对于甲基自由基的自旋加合物,已观察到闭合和开环形式。闭环的速率常数,即停止光激发后后一种异构体向前者的转化,在 20°C 下测量为 7 × 10-3 s-1。新型光致变色硝酮对典型的光致变色化合物玉米黄没有表现出显着的稳定作用,但其作用与流行的商业添加剂具有协同作用。版权所有 © 2000 John Wiley & Sons, Ltd.