ข้อคิดเห็นที่
2:
Method 1 ( Highly Dangerous ; Not suitable for Common / Ordinary Laboratories )
Starting Compound : Salicylic acid
Sulfonating Agent : Liquid Sulfur dioxide
Solvent(s) : Tetrachloroethylene
Sulfonation of Salicylic acid with liquid sulfur trioxide in tetrachloroethylene leads to a nearly quantitative yield of 5-Sulfosalicylic acid
Reference : " Kirk - Othmer Encyclopedia of Chemical Technology "
Method 2
Starting Compound : Salicylic acid
Sulfonating Agent : 2,4,6-trimethylbenzenesulfonic acid ( 1,3,5-trimethylbenzene-2-sulfonic acid )
Mole Ratio of Starting Compound : Sulfonating Agent = 1 : 1
Solvent(s) : Mixture of 1,3,5-trimethylbenzene ; 1,2-dichloroethane ; 1,2-dichlorobenzene
Sulfonation of Salicylic acid with 2,4,6-trimethylbenzenesulfonic acid ( 1,3,5-trimethylbenzene-2-sulfonic acid )
in Mixed Solvents ( 1,3,5-trimethylbenzene ; 1,2-dichloroethane ; 1,2-dichlorobenzene )
will result in 100 % conversion to 5-Sulfosalicylic acid .
Reference : European Patent EP0505582
โดย:
Kung Jig
[29 พ.ค. 2553 08:47]
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