Application of 1435-52-5, In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 1435-52-5, name is 1,4-Dibromo-2-fluorobenzene belongs to bromides-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below.
To a stirred solution of 1,4-dibromo-2-fluorobenzene (Combi-Blocks, 1000 g, 3938 mmol) in ethylene glycol (5100 mL), NMP (500 mL) was added at rt under nitrogen atmosphere. Then potassium tert-butoxide (1547 g, 1378 mmol) was added in portion over 45 min at 5 C and the resulting mixture was heated to 90 C for 16 h. Completion of the reaction was monitored by HPLC. The reaction mixture was cooled to rt and diluted with water (2000 mL) and stirred for 15 min at rt. The resultant solid was filtered and washed with ethylene glycol (300 mL x 2). To the filtrate, water (16000 mL) was added. The mixture was cooled to 10 C and stirred 1 h at the same temperature to get solid. The solid was filtered and washed with water (1000 mL x 2), pet ether (3 X 1000 mL) and dried. This solid was mixed with toluene and toluene was evaporated. This process was repeated 3 times (3 X 500 mL) to give the title compound. Yield: 78% (910 g, White solid). 1H NMR (400 MHz, CDCl3): delta 7.41 (d, J = 8.0 Hz, 1H), 7.06-7.00 (m, 2H), 4.14 (t, J = 4.0 Hz, 2H), 4.01 (q, J = 3.6 Hz, 2H). LCMS: (Method A) 296.0 (M+H), Rt. 3.97 min, 98.16% (Max). HPLC: (Method A) Rt. 3.67 min, 99.53% (Max), 99.38% (220nm).
The synthetic route of 1,4-Dibromo-2-fluorobenzene has been constantly updated, and we look forward to future research findings.
Reference:
Patent; ASCENEURON S. A.; QUATTROPANI, Anna; KULKARNI, Santosh S.; GIRI, Awadut Gajendra; KOEK, Johannes Nicolaas; (64 pag.)WO2017/144635; (2017); A1;,
Bromide – Wikipedia,
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