1. Heterogeneous catalysis in the synthesis and reactivity of allantoin
- Author
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Carlos Cativiela, José M. Fraile, Beatriz Lázaro, Antonio Pallarés, José I. García, José A. Mayoral, DuPont, and Ministerio de Ciencia y Tecnología (España)
- Subjects
chemistry.chemical_compound ,Allantoin ,chemistry ,Urea ,Environmental Chemistry ,Organic chemistry ,Phenol ,Reactivity (chemistry) ,Selectivity ,Heterogeneous catalysis ,Pollution ,Glyoxylic acid ,Catalysis - Abstract
The synthesis of allantoin from glyoxylic acid and urea has been studied using several heterogeneous catalysts. Organic resins and nanocomposites, particularly sulfonic resins, lead to higher yields than zeolites. Polymer morphology has a significant influence on the performance of the catalyst. The possibility of using the same type of solid acid in the reaction of allantoin with phenol has also been explored. However, this route requires a larger amount of acid and leads to lower para/ortho selectivity than the direct route from glyoxylic acid and urea., We are indebted to Dr. Mark A. Harmer, from DuPont Research and Development, for the generous gift of SAC-13. The financial support of DSM Deretil and the Spanish M.C.Y.T. (project PPQ2000-0322-P4) are acknowledged.
- Published
- 2003
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