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ChemicalBook CAS DataBase List 3,4-DIFLUOROPHENETOLE
163848-46-2

3,4-DIFLUOROPHENETOLE synthesis

2synthesis methods
-

Yield:163848-46-2 92.1%

Reaction Conditions:

with tetramethlyammonium chloride;sodium hydroxide in water;N,N-dimethyl-formamide;toluene at 30;Reflux;Industrial scale;

Steps:

4 Preparation of 3,5-difluorophenyl ethyl ether

1000L reactor was charged with sodium hydroxide 40kg, 500kg toluene, 3,4-difluoro-phenol 100kg, Bi administered warmed to reflux trap by trap until no expulsion of water up to give 3,4-difluoro sodium phenoxide. Then cooling to 5kg tetramethylammonium chloride was added after 30 , DMF5kg, plus complete solution of bromoethane 90kg, dropping Albert warmed to reflux incubation reaction to the raw material disappears. After passing cooling to 30 , filtered and the filtrate washed twice 100kg of water was added, layers were separated and the organic layer is a toluene solution of 3,4-difluorophenyl ether. Recovered by distillation of toluene, and then the tower distillation, the product 3,4-difluorophenyl ether 112kg, GC content of> 99.9% and a yield of 92.1%

References:

CN104529723,2016,B Location in patent:Paragraph 0045-0047

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