| 摘要 |
1,136,525. Preparing 3 - benzoyl - 4 - hydroxy - 6 - methoxy - benzene sulphonic acid. GENERAL ANILINE & FILM CORP. 21 Nov., 1967 [22 Nov., 1966], No. 52990/67. Heading C2C. Crystalline anhydrous 3-benzoyl-4-hydroxy-6- methoxy-benzene sulphonic acid is prepared by refluxing 2 - hydroxy - 4 - methoxybenzophenone with chlorosulphonic acid in a halogenated aliphatic solvent in the absence of water. |
