Indirect electrochemical α-methoxylation of aliphatic ethers and acetals - reactivity and regioselectivity of the anodic oxidation using tris(2,4-dibromophenyl)amine as redox catalyst
作者:Klaus-Dieter Ginzel、Eberhard Steckhan、Dieter Degner
DOI:10.1016/s0040-4020(01)87786-3
日期:——
technically important α-methoxylation of aliphatic ethers and acetals to form mixed acetals respectively aldehydes or ortho-esters can be performed electrochemically at low potentials in methanol solution using an undivided cell and tris(2,4-dibromophenyl)amine as redox catalyst. The regioselectivity is usually considerably higher as compared with direct electrolysis in the absence of a catalyst. Especially
脂族醚和缩醛分别形成醛或原酸酯的混合缩醛的技术上重要的α-甲氧基化反应可以在甲醇溶液中以低电位电化学进行,使用三分(2,4-二溴苯基)胺作为氧化还原催化剂。与在不存在催化剂的情况下进行直接电解相比,区域选择性通常要高得多。特别有价值的是在伯或叔碳原子和1,3-二氧戊环中的缩醛碳存在下仲碳原子的区域选择性甲氧基化的方法。氧化还原催化剂在反应条件下是稳定的,因此可以获得超过一千的营业额。