Mechanisms of Reaction of Aminoxyl (Nitroxide), Iminoxyl, and Imidoxyl Radicals with Alkenes and Evidence that in the Presence of Lead Tetraacetate, <i>N</i>-Hydroxyphthalimide Reacts with Alkenes by Both Radical and Nonradical Mechanisms
作者:Sergiu Coseri、G. David Mendenhall、K. U. Ingold
DOI:10.1021/jo0504060
日期:2005.6.1
>NO• radicals: 4-hydroxyTempo, di-tert-butyliminoxyl, both used as the actual radicals, and phthalimide-N-oxyl (PINO) generated from N-hydroxyphthalimide (NHPI) by its reaction with tert-alkoxyl radicals (t-RO•) and with leadtetraacetate. In all cases, except the NHPI/Pb(OAc)4 system, only mono >NO-substituted alkenes were produced. The 2H NMR spectra imply that 88−92% of monoadducts were formed by the
1,2-二氘代环己烯,1,2-二氘代-环辛烯和反式-3,4-二氘代-己烯-3-烯与三个> NO •基团反应:4-羟基Tempo,二叔丁基亚氨基氧基,作为实际的基团,和phthalimide- ñ(-1-氧基PINO)从生成的ñ -hydroxyphthalimide(NHPI通过其与反应)叔-烷氧基自由基(吨-RO •)中并用四乙酸铅。在所有情况下,除了NHPI / Pb(OAc)4系统外,仅生成单> NO-取代的烯烃。在21 H NMR谱图表明88-92%的一加合物是通过首先提取烯丙基H原子,然后通过第二个> NO •捕获烯丙基自由基而形成的,而其余12-8%似乎是通过首先在双键中添加> NO •,然后通过第二个> NO •将H原子抽象化。由NHPI / Pb(OAc)4系统形成的重要的有时是主要的产品在两个双键之间添加了两个PINO部分。由于这种双加合物不是由NHPI / t -RO
Gas-Phase Ozonolysis of Alkenes: Formation of OH from Anti Carbonyl Oxides
作者:Jesse H. Kroll、Neil M. Donahue、Victor J. Cee、Kenneth L. Demerjian、James G. Anderson
DOI:10.1021/ja0266060
日期:2002.7.1
Gas-phase ozone-alkene reactions are known to produce the hydroxyl radical (OH) in high yields. Most mechanistic studies to date have focused on the role of syn carbonyl oxides; however, OH production from ethene ozonolysis indicates a second, poorly understood OH-forming channel, which may contribute to OH production in the ozonolysis of substituted alkenes as well. Using laser-induced fluorescence
Etudes sur le mecanisme de la metathese des olefines
作者:J. Levisalles、H. Rudler、D. Villemin
DOI:10.1016/s0022-328x(00)85621-1
日期:1980.7
<i>N</i>-Hydroxyphthalimide (NHPI)/lead tetraacetate reactions with cyclic and acyclic alkenes
作者:Sergiu Coseri
DOI:10.1002/poc.1466
日期:2009.5
strong influence of leadtetraacetate (or CAN) on the NHPI's reactivity, induce two different channels for the reaction pathway, radical and non‐radical, a complex mixture of both saturated and unsaturated diadducts together with the corresponding monoadduct being formed. This behavior will not occur in the case of PINO generation in non‐metallic systems, in this case the reaction pathway proceed exclusively