发明授权
US06420588B1 Interfacial method of preparing ester-substituted diaryl carbonates
有权
制备酯取代的碳酸二芳基酯的界面方法
- 专利标题: Interfacial method of preparing ester-substituted diaryl carbonates
- 专利标题(中): 制备酯取代的碳酸二芳基酯的界面方法
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申请号: US09911440申请日: 2001-07-24
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公开(公告)号: US06420588B1公开(公告)日: 2002-07-16
- 发明人: Patrick Joseph McCloskey , Timothy Brydon Burnell , Daniel Joseph Brunelle , Elliott West Shanklin , Paul Michael Smigelski, Jr. , Ganesh Kailasam
- 申请人: Patrick Joseph McCloskey , Timothy Brydon Burnell , Daniel Joseph Brunelle , Elliott West Shanklin , Paul Michael Smigelski, Jr. , Ganesh Kailasam
- 主分类号: C07C6996
- IPC分类号: C07C6996
摘要:
High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of methyl salicylate with phosgene in the presence of a phase transfer catalyst (PTC) in an interfacial reaction system in which the pH of the aqueous phase was greater than 9.3. Using the method of the present invention conversions of greater than 99% were obtained whereas under standard conditions using triethylamine as the catalyst conversions were limited to 70-75% of the methyl salicylate starting material even with a 20 mole % excess of added phosgene. The optimized conditions of the of the present invention use only a slight excess of phosgene and represent an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally.