Process for manufacturing 4-chloro-2-butynyl...

Details Process for manufacturing 4-chloro-2-butynyl... Process for manufacturing 4-chloro-2-butynyl...

B - Operations, Transporting

01

J

260/468.7

B01J 31/02 (2006.01) A61K 31/325 (2006.01)

Patent

CA 1074809

IMPROVEMENT IN PROCESS FOR MANUFACTURING 4-CHLORO- 2-BUTYNYL m-CHLOROCARBANILATE ABSTRACT OF THE DISCLOSURE In the process for manufacturing 4-chloro- 2-butynyl m-chlorocarbanilate (the herbicide barban) from the corresponding 4-hydroxy-2-butynyl m-chloro- carbanilate it has been discovered that yields and product quality are improved by employing dimethyl- formamide as reaction promoter in combination with thionyl chloride or phosgene as chlorinating agent.

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