Process for the preparation of R.S. 5-p-hydroxyphenyl-2,4-imidazolidine dione or R.S. 5-p-hydroxyphenyl hydantoin.

摘要

1. A process of preparation of R.S. 5-p-hydroxyphenyl hydantoin, characterized by hot condensing in an acid medium R.S. p-hydroxymandelic acid on urea in excess.