Interrelationship between carboxyvinylketenes, methyleneketenes, vinylketenes, and hydroxyacetylenes
作者:Curt. Wentrup、Primoz. Lorencak
DOI:10.1021/ja00214a035
日期:1988.3
Carboxy(vinyl)ketenes, alkylideneketenes, and vinylketenes have been obtained selectively, sequentially, and isomerically pure for the first time by flash vacuum pyrolysis of 2,2-dimethyl-5-alkylidene-1,3-dioxane-4,6-diones (Meldrum's acid derivatives) under controlled conditions. Each of the ketenes was directly observed by IR spectroscopy and trapped with methanol or aniline. Highly unstable compounds
通过快速真空热解 2,2-二甲基-5-亚烷基-1,3-二恶烷-4,6-二酮,首次选择性地、顺序地获得异构纯的羧基(乙烯基)烯酮、亚烷基烯酮和乙烯基烯酮(Meldrum 的酸衍生物)在受控条件下。每种乙烯酮通过红外光谱直接观察并用甲醇或苯胺捕获。高度不稳定的化合物被认为是亚烷基和乙烯基烯酮的羟基乙炔异构体,这是首次被观察到。