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ChemicalBook CAS DataBase List 1-Bromo-2,5-difluorobenzene
399-94-0

1-Bromo-2,5-difluorobenzene synthesis

4synthesis methods
-

Yield:399-94-0 92.7%

Reaction Conditions:

with N-Bromosuccinimide;sulfuric acid at 30 - 40; for 1 h;Large scale;

Steps:

1.1; 2.1 (1) Bromination reaction:

Add 1000 g of p-difluorobenzene to the reaction vessel, 5000 mL of sulfuric acid, controlled to 30 °C in a water bath. 1620 g of N-bromosuccinimide was slowly added with stirring. Do not exceed 40 °C during the addition. After the addition, the reaction was incubated for 1 h and the GC was followed until the reaction was over. After the reaction, the reaction product was poured into ice water to precipitate a solid, which was suction filtered. 1568 g of 2,5-difluorobromobenzene was obtained as a pale yellow powdery solid, the content was 98%, and the yield was 92.7%.

References:

CN109369412,2019,A Location in patent:Paragraph 0009; 0013

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