申请人:Shell Oil Company
公开号:US04620000A1
公开(公告)日:1986-10-28
In the preparation of a 4-hydroxycinnoline wherein the diazonium salt of a 2-aminoacetophenone in aqueous solution is allowed to undergo cyclocondensation, the improvement that comprises maintaining the pH of the solution between about 4.0 and 8.5 during the cyclocondensation.
在制备4-羟基菲啰啉时,将2-氨基苯乙酮的重氮盐溶解在水溶液中,使其进行环缩反应。改进的方法包括在环缩反应过程中保持溶液的pH值在大约4.0至8.5之间。