公开(公告)号：GB675796A

公开(公告)日：1952-07-16

申请号：GB309850

申请日：1950-02-07

Applicant: BASF AG

Inventor： HOPFF HEINRICH ,  SPAENIG HERMANN

IPC: C07C51/15

Abstract: Salicylic acids substituted by alkyl, alkoxy, hydroxy or amino groups are obtained by the customary reaction between alkaline solution of the phenol, and carbon dioxide, performed continuously by pumping the reaction mixture through pressure vessels, preferably with the addition of oxidation-inhibitors, such as ascorbic acid. Examples give the production of p-amino-salicylic acid, 2 - hydroxy - 4 - amino - 5 - methylbenzoic acid, and gentisic acid by this method, the acids being liberated by mineral acid; sodium hydrosulphite being used as oxidation inhibitor.

公开(公告)号：CA581479A

公开(公告)日：1959-08-18

申请号：CA581479D

Applicant: BASF AG

Inventor： HOPFF HEINRICH ,  RIEDL HANS-JOACHIM

公开(公告)号：CA581478A

公开(公告)日：1959-08-18

申请号：CA581478D

Applicant: BASF AG

Inventor： HOPFF HEINRICH ,  SCHICKH OTTO VON ,  RIEDL HANS-JOACHIM