Oxidations by the system “hydrogen peroxide–[Mn2L2O3][PF6]2 (L=1,4,7-trimethyl-1,4,7-triazacyclononane)–oxalic acid”. Part 6. Oxidation of methane and other alkanes and olefins in water
作者:Georgiy B. Shul’pin、Galina V. Nizova、Yuriy N. Kozlov、Vladimir S. Arutyunov、Ana Cláudia M. dos Santos、Ana Carolina T. Ferreira、Dalmo Mandelli
DOI:10.1016/j.jorganchem.2005.01.065
日期:2005.10
Oxidation of alkanes with hydrogen peroxide in water solution at 10–50 °C is efficiently catalyzed by the cationic dinuclear manganese (IV) derivative [Mn2L2O3]2+ (1, with L = 1,4,7-trimethyl-1,4,7-triazacyclononane, TMTACN) in the form of the hexafluorophosphate salt ([1][PF6]2) if oxalic acid is present as a co-catalyst. Methane gives methanol and formaldehyde (turnover numbers, TONs, were 7 and
阳离子双核锰(IV)衍生物[Mn 2 L 2 O 3 ] 2+(1,L = 1,4,7-三甲基六氟磷酸盐([ 1 ] [PF 6 ] 2)形式的-1,4,7-三氮杂环壬烷,TMTACN)如果草酸作为助催化剂存在。甲烷制得甲醇和甲醛(用抗坏血酸还原反应混合物后,总吨数分别为7和2),而环己烷被TONs氧化至160,得到环己基氢过氧化物,环己酮和环己醇(酮是主要的产物,尽管在室温下几乎形成纯净的烷基氢过氧化物。与乙腈中的氧化相反,在水中与直链正构烷烃的反应显示出不同寻常的含氧化合物分布。例如,在正庚烷的氧化中,链4位上亚甲基的标准化反应性是CH 2的3–7倍在[ 1 ] [PF 6 ] 2和草酸的存在下,在少量乙腈和TONs高达1000(在没有MeCN的情况下未检测到环氧化)。