Method for preparing 4-hydroxycinnolines in a pH controlled system
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.