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. 399-94-0, name is 1-Bromo-2,5-difluorobenzene belongs to bromides-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. name: 1-Bromo-2,5-difluorobenzene
2-Bromo-1,4-difluorobenzene (53.6 g, 277.74 mmol) in THF cooled to -50 C. was added to isopropyl magnesium chloride (2M in THF) (133 mL, 266 mmol). The reaction mixture thus obtained was warmed to 0 C. and stirred for 1 h. The reaction mixture was cooled again to -50 C. 4-chloro-N-methoxy-N-methylbutanamide (40 g, 241.52 mmol) in THF (200 mL) was added dropwise to this reaction mixture with stirring and the stirring was continued at 0 C. for 1 h. The reaction mixture was quenched with saturated aqueous NH4Cl solution, extracted with ethylacetate. The organic layer collected was washed with water (500 mL) and then with brine solution, dried over anhydrous sodium sulfate and concentrated under reduced pressure to afford a crude liquid residue. The residue thus obtained was purified by column chromatography (using 60-120 silica gel and 5% EtOAc in Hexane as eluent) to afford 35 g of the title compound as a colourless liquid. 1H NMR (300 MHz, CDCl3) delta ppm 7.6-7.53 (1H, m), 7.26-7.09 (2H, m), 3.7 (2H, t) 3.22-3.14 (2H, m), 2.28-2.16 (2H, m).
The synthetic route of 399-94-0 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; DR. REDDY’S LABORATORIES LTD.; Sasmal, Pradip Kumar; Ahmed, Shahadat; Tehim, Ashok; Pradkar, Vidyadhar; Dattatreya, Prasanna M.; Mavinahalli, Nanjegowda Jagadeesh; US2014/371217; (2014); A1;,
Bromide – Wikipedia,
bromide – Wiktionary