A homogeneous liquid phase process for producing a vinyl carboxylate in which the carboxylate group contains at least four carbon atoms, which process comprises (1) forming a homogeneous liquid reaction mixture containing ethylene, oxygen carboxylic acid having at least three carbon atoms, a palladium (II) catalyst and a copper (II) oxidant and (2) maintaining the reaction mixture under conditions at which the ethylene and the carboxylic acid react to form the vinyl carboxylate in the homogeneous liquid reaction mixture, with the proviso that at least one of the following conditions exists during said process:
(i) the copper (II) oxidant is a copper (II) carboxylate in which carboxylate group has a molecular weight that is higher than the molecular weight of the carboxylate group in the carboxylic acid;
(ii) the palladium (II) catalyst is formed in situ in the reaction mixture by the oxidation of a palladium (0) colloid; and/or
(iii) the reaction mixture also contains a polyglyme compound as a promoter.
生产含有至少四个碳原子的
乙烯羧酸酯的均相液相过程,该过程包括(1)形成一个均相液体反应混合物,其中包含
乙烯、至少含有三个碳原子的
羧酸、
钯(II)催化剂和
铜(II)氧化剂;(2)在维持
乙烯和
羧酸在均相液体反应混合物中反应形成
乙烯羧酸酯的条件下,维持反应混合物,但在该过程中至少存在以下条件之一:(i)
铜(II)氧化剂是一种
铜(II)
羧酸盐,其中
羧酸盐的分子量高于
羧酸中
羧酸基的分子量;(ii)
钯(II)催化剂在反应混合物中通过
氧化钯(0)胶体形成;和/或(iii)反应混合物还包含一种
聚乙二醇醚化合物作为
促进剂。