... The concentrated organic layer was distilled, giving 1.03 g (31% yield of 17, bp 96-102 "C. Further purification of the product was accomplished by sem- ... (e) Hanafusa, T.; Ichihara, J.; Asida, T. Chem. ... (6) A review of the chemistry of hydantoins can be found in: Ware, E. Chem. ...