To a solution of 0.80 g of 2-p-chlorophenyl-5-(2,5-dimethylphenoxy)-4-oxazoleacetic acid in 8 ml of dimethylformamide were added 1 ml of triethylamine and 1.5 ml of ethyl bromide. The mixture was stirred at 35°-40° C. for 90 minutes. The reaction mixture was poured into water and ethyl acetate and shaken with a separate funnel. The organic layer was successively washed with water, diluted hydrochloric acid and water, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The white crystalline residue was recrystallized from n-hexane to give 0.68 g of the title compound as white fine needles, melting at 122°-123.5° C.
