Bromine → 1-Bromo-4-cyclopropylbenzene

Participants

Reaction Steps

Cyclopropyl benzene (48.5 g, 410 mmol), glacial acetic acid (510 mL), and sodium acetate (38.9 g, 474 mmol) were added to a roundbottomed flask. The flask was cooled in an ice-water bath. A solution of bromine (66.3 g, 414 mmol) dissolved in 105 mL of acetic acid was added dropwise over 90 min. The reaction mixture was stirred at temperatures between 0° C. and 10 ° C. for 5 h. The reaction was then allowed to warm to rt overnight. Hexanes (1300 mL) and water (250 mL) were added. Aqueous NaHSO3 (1M) was added until the reaction mixture changed from yellow to clear. The layers were separated. The organic layer was washed with water, 1M aq Na2CO3, and brine, then dried with Na2SO4. The solvent was evaporated and the crude product was purified via sgc using hexanes as the mobile phase to give 17 g of p-cyclopropylbromobenzene (21%) (Compound 44).

Provenance & Evidence