发明授权
- 专利标题: Method and apparatus for preparing monofunctional aromatic chloroformates suitable for use as chainstopping agents
- 专利标题(中): 制备适用于止痛剂的单官能芳族氯甲酸酯的方法和装置
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申请号: US09281498申请日: 1999-03-30
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公开(公告)号: US06392079B1公开(公告)日: 2002-05-21
- 发明人: James Manio Silva , David Michel Dardaris , Peter David Phelps
- 申请人: James Manio Silva , David Michel Dardaris , Peter David Phelps
- 主分类号: C07C6996
- IPC分类号: C07C6996
摘要:
A continuous process for the preparation of monofunctional aromatic chloroformates (MAC) having the structure (I) wherein n is an integer from 1 to 5, and R1 represents hydrogen, a branched or unbranched alkyl group having from 1-15 carbon atoms, an aryl group which may be substituted or unsubstituted, a cycloaliphatic group which may be substituted or unsubstituted, or an arylalkyl group which may be substituted or unsubstituted, the method comprising the steps of a) introducing 1) an aqueous caustic solution; 2) a carbonyl chloride; 3) at least one monofunctional hydroxyaromatic compound; and 4) at least one inert organic solvent into a continuous reaction system; and b) effecting contact between 1), 2), 3) and 4) for a time and at conditions sufficient to produce a MAC of structure (I).