比较了与顺式1,4-聚异戊二烯和各种模型进行的单线态氧反应的研究结果。针对两种模型讨论了产物的性质及其反应性,即低聚二烯和具有不同取代基长度的三取代单烯烃。双键的反应性随着烷基取代基的延长而降低,但是4-甲基-4-辛烯的反应性接近于聚合物。齐聚二烯中的单元的氢过氧化作用不会使相邻的单元显着失活而趋向于单线态氧的添加。烯丙基氢a,b和c在烯烃中的反应性取决于取代基的位置和长度,并遵循以下顺序K c > k b > k a。合成烯加成的原理可以推断为聚异戊二烯。为顺1,4-聚异戊二烯1 O 2反应确定的速率常数可以得出这样的结论,即1 O 2与固体聚合物发生反应的可能性可能很高。聚合物和模型在此反应中的行为相似,可以估算其他不饱和或反应性聚合物对1 O 2的反应性。
Reactions of singlet oxygen with polyisoprene and model compounds
作者:C. Tanielian、R. Mechin
DOI:10.1016/s0040-4020(01)96585-8
日期:1985.1
Results from the study of singletoxygenreaction with cis-1,4-polyisoprene and with various models are compared. The nature of the products and their reactivity are discussed for two kinds of models, namely oligodienes and trisubstituted mono-olefins with various substituent length. The reactivity of the double bond decreases with lengthening of the alkyl substituents but the reactivity of 4-methyl-4-octene
比较了与顺式1,4-聚异戊二烯和各种模型进行的单线态氧反应的研究结果。针对两种模型讨论了产物的性质及其反应性,即低聚二烯和具有不同取代基长度的三取代单烯烃。双键的反应性随着烷基取代基的延长而降低,但是4-甲基-4-辛烯的反应性接近于聚合物。齐聚二烯中的单元的氢过氧化作用不会使相邻的单元显着失活而趋向于单线态氧的添加。烯丙基氢a,b和c在烯烃中的反应性取决于取代基的位置和长度,并遵循以下顺序K c > k b > k a。合成烯加成的原理可以推断为聚异戊二烯。为顺1,4-聚异戊二烯1 O 2反应确定的速率常数可以得出这样的结论,即1 O 2与固体聚合物发生反应的可能性可能很高。聚合物和模型在此反应中的行为相似,可以估算其他不饱和或反应性聚合物对1 O 2的反应性。
Confined Space-Controlled Hydroperoxidation of Trisubstituted Alkenes Adsorbed on Pentasil Zeolites
the zeolites and reacted with alkenes. For all the substrates studied, the ene-type allylic hydroperoxides were obtained in a highly regioselective manner. The regiochemistry for 1−4 in favor of the allylic hydrogen abstraction from the largest substituents is in contrast to their photooxidation within the dye-supported zeolite Na−Y, where the secondary hydroperoxides are preferentially produced. The