Method for preparing 4-alkyl-2-hydroxy-3,5-dichlorobenzene sulph

Details Method for preparing 4-alkyl-2-hydroxy-3,5-dichlorobenzene sulph Method for preparing 4-alkyl-2-hydroxy-3,5-dichlorobenzene sulph

1996-07-01

1997-11-04

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfonic acids or salts thereof

C07C30930

Patent

active

056841833

ABSTRACT:
The invention is related to a method for preparing 4-alkyl-2-hydroxy-3,5-dichlorobenzene sulphonic acids by sulphonating 4-chloro-3-alkylphenol and by chlorinating 4-alkyl-2-hydroxy-5-chlorobenzene sulphonic acid present in an acidic reaction mixture. According to the invention, chlorination is carried out by adding, to the acidic reaction mixture, salts of hypochlorous and/or chloric acids and, when needed, hydrochloric acid or its salt.

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