Process for the preparation of allantoin

Details Process for the preparation of allantoin Process for the preparation of allantoin

1991-05-30

1993-03-23

Morris, Patricia L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23388

Patent

active

051965453

ABSTRACT:
Process for the preparation of allantoin in a two-stage reaction by reaction of methyl glyoxylate methyl hemiacetal with urea in the presence of an inorganic acid at a pH-value of 1.0-2.0 and carrying out the ring-closure reaction at a pH-value of 7.0 to 9.0 in a second reaction stage.

REFERENCES:
patent: 2158098 (1939-05-01), Zellner et al.
patent: 4692547 (1987-09-01), Driscoll et al.
patent: 4814491 (1989-03-01), Driscoll et al.
"Chemical Abstracts", vol. 97, entry 55807b (1982).
"Chemical Abstracts", vol. 97, entry 92275x (1982).
"Tetrahedron", 33, 1191-1196 (1977).

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