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    • 34. 发明授权
    • Solventless preparation of ester-substituted diaryl carbonates
    • 酯取代的碳酸二芳基酯的无溶剂制备
    • US06469192B1
    • 2002-10-22
    • US09911527
    • 2001-07-24
    • Timothy Brydon BurnellPatrick Joseph McCloskeyGanesh KailasamJames Anthony Cella
    • Timothy Brydon BurnellPatrick Joseph McCloskeyGanesh KailasamJames Anthony Cella
    • C07C6996
    • C07C68/02C07C69/96
    • High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of ester-substituted phenols with phosgene in the presence of a phase transfer catalyst (PTC) and optionally a tertiary amine catalyst in a solvent free reaction system comprising an aqueous phase held at a pH of 8.3 or higher. The optimized conditions of the present invention use an excess of ester-substituted phenol relative to phosgene and high conversion of phosgene to ester-substituted diaryl carbonate is observed. The product ester-substituted diaryl carbonate may be conveniently isolated as a solid by filtration or as a liquid in which the excess ester-substituted phenols serves as solvent. The method represents an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally.
    • 通过在相转移催化剂(PTC)和任选的叔胺催化剂存在下,在无溶剂反应体系中,酯取代的酚与光气的缩合得到高收率的酯取代的二元碳酸酯,例如碳酸双甲基水杨酸酯 包含保持在8.3或更高的pH的水相。 本发明的优化条件相对于光气使用过量的酯取代的苯酚,观察到光气转化为酯取代的碳酸二芳基酯的高转化率。 产物酯取代的碳酸二芳基酯可以通过过滤或作为其中过量的酯取代的酚用作溶剂的液体方便地分离为固体。 该方法通常用于制造碳酸双甲基水杨酸酯和酯取代的二芳基碳酸酯的有吸引力的途径。