Kinetics of nitroxide radical trapping. 2. Structural effects
作者:V. W. Bowry、K. U. Ingold
DOI:10.1021/ja00039a006
日期:1992.6
Laserflashphotolysis and kinetic competition product studies have demonstrated that in isooctane at ambient temperatures the rate constant for coupling of carbon-centered radicals with persistent nitroxides, k T , depends upon the degree of steric hindrance to coupling and upon the extent of resonance stabilization of the carbon radical. Sterically induced reductions in the magnitude of k T are observed
激光闪光光解和动力学竞争产物研究表明,在环境温度下,在异辛烷中,以碳为中心的自由基与持久性氮氧化合物的偶联速率常数 k T 取决于偶联的空间位阻程度和共振稳定的程度。碳自由基。对于氮氧化合物结构和碳自由基结构的变化,观察到 k T 大小的空间诱导减少。因此,对于任何特定的碳基,k T 对于 Bredt 规则保护的氮氧化物、9-氮杂双环 [3.3.1] 壬烷-N-氧基 (ABNO) 和去甲托烷-N-氧基而言是最大的,而对于通常的'二叔-烷基氮氧化物 k T 沿系列递减,1,1,3,3-四甲基异碘啉-2-氧基≥2,2,5,5-四甲基哌啶-1-氧基(Tempo)>二叔丁基氮氧化物,i.
Grant, Richard D.; Rizzardo, Ezio; Solomon, David H., Journal of the Chemical Society. Perkin transactions II, 1985, p. 379 - 384
作者:Grant, Richard D.、Rizzardo, Ezio、Solomon, David H.
DOI:——
日期:——
GRANT, R. D.;RIZZARDO, E.;SOLOMON, D. H., J. CHEM. SOC. PERKIN TRANS., 1985, N 3, 379-384
作者:GRANT, R. D.、RIZZARDO, E.、SOLOMON, D. H.
DOI:——
日期:——
The Photodynamic Covalent Bond: Sensitized Alkoxyamines as a Tool To Shift Reaction Networks Out-of-Equilibrium Using Light Energy
作者:Martin Herder、Jean-Marie Lehn
DOI:10.1021/jacs.8b03633
日期:2018.6.20
alkoxyamines are coupled to a xanthone unit as triplet sensitizer enabling their reversible photodissociation into two radical species. By studying the photochemical properties of three generations of sensitized alkoxyamines it became clear that the nature and efficiency of tripletenergytransfer from the sensitizer to the alkoxyamine bond as well as the reversibility of photodissociation crucially depends