A New and Efficient Method for the Preparation of 2, 4, 6, 8-Tetraazabicyclo [3.3. 0] octane-3, 7-diones (Glycolurils) Catalyzed by Keggin, Wells-Dawson, and Preyssler …

R Tayebee, RS Esmaeil…

Index: Tayebee, Reza; Esmaei, Rezaei-Seresht; Behrooz, Maleki Letters in Organic Chemistry, 2012 , vol. 9, # 3 p. 183 - 191

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Abstract

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 ...