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.
α-位由酮基、酯基或腈基激活的羧酸酯,即具有以下式子的化合物:##STR1## 其中X为COOR.sup.4、COR.sup.5或CN,多个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(如氯化钠)和含磷溶剂(如磷氧化胆碱、磷氧化环己烷或磷氧化磷烷)存在下加热脱羧乙酯。其中,a-k和R可以有不同的定义。反应开始或结束时存在水,然后进行产物分离。该反应进行顺利,收率高。