Some important cis- and trans-alkyl substituted glycolurils were prepared via condensation of vicinal dicarbonyl compounds with urea and/or methylurea catalyzed by 0.95 mol% of Keggin- type H3PW12O40 under environmentally benign and simple condition. Proficiency of structurally different heteropolyoxometalates, including Keggin, Wells-Dawson, and Preyssler, was investigated in the reaction of urea with 2, 3-butanedione. A common method was introduced for the isolation of cis- and trans-isomers, role of different solvents was studied, and effect of catalyst mol% was also investigated in this reported.
一些重要的顺式和反式烷基取代的乙二
脲通过在环境友好且简单的条件下,以0.95 mol%的Keggin型H3PW12O40催化,采用相邻二羰基化合物与
尿素和/或甲基
尿素的缩合反应制备。对结构不同的异质多
金属氧酸盐,包括Keggin、Wells-Dawson和Preyssler,在
尿素与2,3-
丁二酮反应中的催化能力进行了研究。介绍了一种用于分离顺式和反式异构体的通用方法,研究了不同溶剂的作用,并探讨了催化剂摩尔百分比的影响。