反应详情

温度

70 °C

A mixture of 54 g (0.13 mol) of 2-propionyl-3-hydroxy-5-(4-benzyloxyphenyl)-4-(carboethoxy)cyclohex-2-en-1-one and 30 g (0.37 mol) of 50 percent sodium hydroxide in 450 mL of 95 percent ethanol and 100 mL of water was stirred mechanically and heated at about 70° C. for 16 hours. The resulting clear yellow solution was cooled to about 60° C. and treated with 50 mL of concentrated HCl. The product precipitated from the solution and was isolated by filtration. Recrystallization from absolute ethanol gave the above named product as a beige crystalline solid in a yield of 24 g (54 percent of theoretical). The product melted at 114°-115° C.; 1H NMR (CDCl3): δ 1.17 (t, 3H, --CH3), 2.60-3.48 (m, 7H, ring protons and --CH2CH3), 5.05 (s, 2H, ArCH 2O--), 6.83-7.55 (m, 9H, ArH's), 18.1 (s, 1H, enol, H).

1. temperatureThe resulting clear yellow solution was cooled to about 60° C.
2. customThe product precipitated from the solution
3. customwas isolated by filtration
4. customRecrystallization from absolute ethanol
5. customgave the