反应详情

温度

80 °C

1-Methyl-3-n-propylpyrazole-5-carboxylic acid ethyl ester (20.2 g, 0.10 mol) was suspended in 6N aqueous sodium hydroxide solution (50 ml, 0.30 mol). The mixture was heated to 80° C. for 2 hours then diluted with water (50 ml) and acidified with concentrated hydrochloric acid (25 ml). Filtration gave the carboxylic acid as pale brown crystals (12.3 g, 71%), m.p. 150°-154° C. Found: C, 56.99; H, 7.25; N,16.90. C8H12N2O2 requires C, 57.13; H, 7.19; N, 16.66%.

1. filtrationFiltration