Sodium Carbonate → HCID 178488937, compound

Participants

Reaction Steps

2-(p-Methoxyphenyl)-4-methylimidazole, (5.0 g, 0.0265 mole), was dissolved in CH3CN (250 ml) at the boiling point. The solution was cooled to room temperature and stirred while a solution of pyridinium bromide perbromide (7.0 g) in CH3CN (70 ml) was added dropwise. A precipitate separated as the addition was completed (30 min) and stirring was continued for 30 minutes. The mixture was poured into water (1.5 L) and the precipitated hydrobromide salt was collected. The filtrate was made basic with saturated Na2CO3 solution and the product was collected, washed with water, and dried to afford 2.45 g, m.p. 183°-187° C. The hydrobromide salt was dissolved in hot CH3CN (75 ml)-H2O (25 ml) and the solution was made basic with saturated Na2CO3 solution. A second crop of product was collected, washed with water, and dried to yield 2.2 g of 35; m.p. 179°-184° C.; 65 % combined yield. A sample of the first crop recrystallized from 50% CH3CN melted at 184°-187° C.

Provenance & Evidence