PROCESS FOR THE MANUFACTURE OF R.S P-HYDROXYPHENYL-5 IMIDAZOLIDINE-DIONE-2,4 OR R.S P-HYDROXYPHENYL-5 HYDANTOINE

摘要

The invention relates to a process for the manufacture of RS p-hydroxyphenyl-5-imidazolidinedione-2,4 or RS p-hydroxyphenyl-5-hydantoin. /P P This process consists in condensing hot, in an acid medium, RS p-hydroxymandelic acid with an excess of urea. /P P Application to the manufacture of RS p-hydroxy-phenyl-5-imidazolidinedione-2,4 or RS p-hydroxy-5-hydantoin.