Bimolecular Formation of Radicals by Hydrogen Transfer, 12. – Transfer hydrogenation ofp-Substituted α-Methylstyrenes and of 9-Methylenefluorene as a Criterion of Mechanism
作者:Heike Friebolin、Rolf Roers、Jochen Ebenhoch、Matthias Gerst、Christoph Rüchardt
DOI:10.1002/jlac.199719970216
日期:1997.2
the solvent effect is small. A hydrogen atom transfer mechanism (retrodisproportionation) is, therefore, preferred to a hydride transfer mechanism. This is supported by the very similar reactivity of the hydrogen transfer reaction of DHA and XAN with 9-methylenefluorene. The product yields in all reactions investigated in this project were >90%.
对9,10-二氢蒽(DHA),x吨(XAN)或9,10-二氢ac啶(DHAC)进行了取代的α-甲基苯乙烯的未催化转移加氢反应进行了机理研究。这三个氢供体以非常相似的速率和相似的活化参数进行反应,并且在各种取代的苯乙烯之间几乎没有区别。动力学同位素效应也相似,溶剂效应很小。因此,氢原子转移机理(逆歧化作用)优于氢化物转移机理。DHA和XAN与9-亚甲基芴的氢转移反应非常相似的反应性支持了这一点。在该项目中研究的所有反应中,产物收率均> 90%。