Process for preparing 1-substituted 5-hydroxy-imidazoline-2,4-diones and 1-substituted 5-alkoxy-imidazoline-2,4-diones
A process for preparing specific 1-substituted 5-hydroxy-imidazoline-2,4-diones by reacting glyoxylic acid with N-substituted ureas is provided, where this process is carried out in a 10-80% strength aqueous solution and in the presence of an acid catalyst. The 1-substituted 5-hydroxy-imidazoline-2,4-diones can subsequently be converted in a further reaction step to give 1-substituted 5-alkoxy-imidazoline-2,4-diones.
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Example 4
(2010/01/31)
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