申请人:Elf Atochem S.A.
公开号:US05169980A1
公开(公告)日:1992-12-08
This process for the manufacture of benzyl methacrylate and of its halogenated or alkylated derviatives by the reaction of benzyl chloride or of one of its halogenated or alkylated derivatives with an alkali metal methacrylate is characterized in that the reaction is carried out in the presence of not more than 3 mol %, based on the benzyl chloride or a derivative, of a tertiary amine. The alkali metal is chosen especially from lithium, potassium and sodium. The tertiary amine is preferably a tertiary diamine of general formula: ##STR1## in which n is an integer ranging from 1 to 10 and R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which are identical or different, are alkyl, cycloalkyl or aryl radicals containing from 1 to 12 carbon atoms, functionalized if appropriate and, if appropriate, such that they form a heterocyclic ring with the nitrogen atom(s) carrying them.
这种用苄基氯或其卤代或烷基衍生物与碱金属甲基丙烯酸酯反应制备苄基丙烯酸苄酯及其卤代或烷基化衍生物的工艺过程的特点在于,在存在不超过苄基氯或其衍生物的3摩尔%的情况下,使用三级胺进行反应。碱金属特别选择自锂、钾和钠。三级胺最好是一般式为的三级二胺:##STR1##其中n是1到10的整数,R.sub.1、R.sub.2、R.sub.3和R.sub.4是相同或不同的烷基、环烷基或含有1到12个碳原子的芳基,如有必要经功能化处理,如有必要,它们与氮原子形成杂环。