申请人:Sainani Jaiprakash Brijlal
公开号:US20140194647A1
公开(公告)日:2014-07-10
The invention relates to a process for preparing (2,3) disubstituted succinates that allows (2,3) disubstituted succinates to be obtained in good purity and with acceptable reaction yields. The (2) and (3) substitutions may be the same or different. The process comprises reacting a haloacetate with a malonic acid ester into a tricarboxylate, which is further reacted to a (2,3) disubstituted tricarboxylate, hydrolysed, decarboxylated and optionally esterified. Esterified (2,3) disubstituted succinic esters may be used as internal donor in Ziegler-Natta type catalysts for the polymerisation of olefins.
本发明涉及一种制备(2,3)二取代琥珀酸盐的方法,该方法可使(2,3)二取代琥珀酸盐以良好的纯度和可接受的反应产量获得。 (2)和(3)的取代基可以相同也可以不同。该方法包括将卤代酸酯与丙二酸酯反应成三羧酸酯,进一步反应成(2,3)二取代三羧酸酯,水解,脱羧和可选酯化。酯化的(2,3)二取代琥珀酸酯可以用作Ziegler-Natta型催化剂中的内部给体,用于烯烃的聚合。