Synthesis, Characterization, and Reactivity of the <i>m</i>-Xylylene Anion in the Gas Phase. The Enthalpy of Formation of <i>m</i>-Xylylene
作者:Loubna A. Hammad、Paul G. Wenthold
DOI:10.1021/ja002138n
日期:2000.11.1
ion, with the rest being 3-methyl-α,n-dehydrotoluene ions resulting from [α, ring] hydrogen abstraction. The m-xylylene negative ion underwent reactions similar to those observed for 3-methylbenzyl anion and for other open-shell ions. The m-xylylene ion also reacted with mesitylene by H2+ transfer. The acidity of the 3-methylben...
已使用两种不同的气相方法测定了间醌二甲烷 (m-xylylene) 的形成焓。第一个涉及将双自由基的电子亲和力 (0.919 ± 0.008 eV, Wenthold, PG; Kim, JB; Lineberger, WCJ Am. Chem. Soc. 1997, 119, 1354) 与 3-甲基苄基自由基的酸度相结合。3-甲基苄基自由基的酸度是通过将间二甲苯离子与原子氧离子在流动余辉三重四极杆装置中反应制备的间二甲苯离子的质子亲合力括起来来确定的。氘标记和反应性研究表明,反应中形成的 H2+ 提取产物的 75% 是间二甲苯离子,其余为 3-甲基-α,n-脱氢甲苯离子,来自 [α, 环] 氢提取。间二甲苯负离子经历的反应类似于观察到的 3-甲基苄基阴离子和其他开壳离子的反应。间二甲苯离子还通过 H2+ 转移与均三甲苯反应。3-甲基苯的酸...