Radical Chain Reduction of Alkylboron Compounds with Catechols
作者:Giorgio Villa、Guillaume Povie、Philippe Renaud
DOI:10.1021/ja110224d
日期:2011.4.20
carboxylic acid at high temperature (>150 °C). We report here a mild radical procedure for the transformation of organoboranes to alkanes. 4-tert-Butylcatechol, a well-established radical inhibitor and antioxidant, is acting as a source of hydrogen atoms. An efficient chain reaction is observed due to the exceptional reactivity of phenoxyl radicals toward alkylboranes. The reaction has been applied to a wide
烷基硼烷向相应烷烃的转化通常通过烷基硼烷的质子分解进行。这个简单的反应需要使用严格的反应条件,即在高温(> 150 °C)下用羧酸处理。我们在这里报告了一种将有机硼烷转化为烷烃的温和激进程序。4-叔丁基儿茶酚是一种成熟的自由基抑制剂和抗氧化剂,是氢原子的来源。由于苯氧基自由基对烷基硼烷的特殊反应性,观察到有效的链式反应。该反应已应用于广泛的有机硼衍生物,例如 B-烷基儿茶酚硼烷、三烷基硼烷、频哪醇硼酸酯和烷基硼酸。此外,迄今为止,通过实验确定了仲烷基自由基和邻苯二酚衍生物之间的氢转移的难以捉摸的速率常数。有趣的是,它们在 80 °C 时比氢化锡慢不到 1 个数量级,这使得儿茶酚对涉及 CC 键形成的广泛转化特别有吸引力。
Evidence for single electron transfer in the reaction of alkoxides with alkyl halides
作者:E.C. Ashby、Dong-Hak Bae、Won-Suh Park、Robert N. Depriest、Wei-Yang Su
DOI:10.1016/s0040-4039(01)81536-7
日期:1984.1
Evidence for a radical process in the reaction of lithium alkoxides with alkyl iodides was obtained by the observation of cyclization of appropriate radical probes, by the trapping of radicals, and by EPR spectroscopic observations relating to the one electron donor properties of alkoxides.