2，2－亚戊基－1，3－二氧六环－4，6－二酮与原甲酸三乙酯和脲素衍生物的反应

Reaction of 2, 2-Pentamethylene-1,3-dioxan-4,6-dione with Triethyl Orthoformate,and Urea Derivatives

２，２－亚基－１，３－二氧六环－４，６－二酮与原甲酸三乙酯和脲素衍生物反应，合成了六个新化合物（４ａ－ｆ）．在它们的ＩＲ谱图中，没有羟基的特征吸收峰，表明４ａ－ｆ以分子内氢键形式存在．该类反应具有试剂安全、得率好、条件温和、操作简便等特点．

Reactions of 2, 2-pentamethylene-1, 3-dioxan-4, 6-dione with triethyl orthoformate and urea derivatives proceed smoothly to give the corresponding products(4a-f). Lack of the characteristic peak of hydroxyl group in IR of 4a-f indicatesthat the most possible structure of 4 is the intramolecular hydrogen-bondedform. The advantages are safe reagents, good yields, mild and simple operatingconditions.