申请人:Bayer Aktiengesellschaft
公开号:US04276225A1
公开(公告)日:1981-06-30
A carboxylic acid ester activated in .alpha.-position by a keto, ester or nitrile group, i.e. of the formula ##STR1## where X is COOR.sup.4, COR.sup.5 or CN, and the several R's can have various meanings but only R.sup.1 and R.sup.2 can be hydrogen, is decarbalkoxylated by heating in the presence of a salt, e.g. sodium chloride, and a phosphorus-containing solvent such as a phospholine oxide, phospholane oxide or phosphetane oxide of the formulas ##STR2## wherein a-k and R can have varied definitions. Water is present either at the outset or end of the reaction before product separation. The reaction proceeds smoothly and in good yields.
一种由酮、酯或腈基在α位激活的羧酸酯,即具有以下式子的化合物:##STR1## 其中X为COOR.sup.4、COR.sup.5或CN,且几个R可以有不同的含义,但只有R.sup.1和R.sup.2可以是氢,通过在盐(例如氯化钠)和含磷的溶剂(如磷氧化胺、磷环氧化胺或磷杂环氧化胺)的存在下加热进行脱羧乙酯化反应,其中上述溶剂具有以下式子:##STR2## 其中a-k和R可以有不同的定义。在反应开始或结束时存在水,然后分离产物。该反应进行顺利且收率良好。