Process for the preparation of 3-(3,5-dichlorophenyl)-hydantoin

Details Process for the preparation of 3-(3,5-dichlorophenyl)-hydantoin Process for the preparation of 3-(3,5-dichlorophenyl)-hydantoin

1976-08-12

1978-07-04

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23376

Patent

active

040990087

ABSTRACT:
A process for the manufacture of 3-(3,5-dichlorophenyl)-hydantoin comprises cyclizing 3-(3,5-dichloro-phenyl)-ureidoacetic acid in the presence of a catalytic amount relative to the ureidoacetic acid of an acid dehydrating agent and in the presence of an organic solvent which forms an azeotrope with water; the water formed during the reaction is eliminated by azeotropic distillation.

REFERENCES:
patent: 3389146 (1968-06-01), Kitasaki et al.
patent: 3395153 (1968-07-01), Kitasaki et al.
patent: 3448116 (1969-06-01), McCaully et al.
patent: 3668217 (1972-06-01), Fujinami et al.
patent: 3676456 (1972-07-01), Gruenfeld
patent: 3684774 (1972-08-01), Merten et al.
patent: 3814776 (1974-06-01), Fischer et al.

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