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Title:
PROCESS FOR PRODUCING 4,6-DIAMINORESORCINOL OR ITS SALTS
Document Type and Number:
WIPO Patent Application WO/1999/037601
Kind Code:
A1
Abstract:
A process for producing 4,6-diaminoresorcinol or its salt which comprises reducing by hydrogenation in the presence of a metallic catalyst 4,6-bis(substituted)phenylazoresorcinol represented by general formula (1) (for example, 4,6-bisphenylazoresorcinol) to give 4,6-diaminoresorcinol or its salts. In said formula, represent each halogeno, C¿1-5? alkyl, hydroxycarbonyl or C¿1-5? alkoxy, provided that two or more Rs may be either the same or different from each other; and n is 0 or an integer of from 1 to 5; characterized by using an aliphatic nitrile compound (for example, acetonitrile) as a solvent, or effecting the reduction by using at least one organic solvent selected from among aliphatic nitrile compounds, aliphatic C¿3-5? alcohols, dioxane, ethylene glycol monomethyl ether, etc. in the presence of a filter aid (for example, active carbon). This process makes it possible to easily produce highly pure 4,6-diaminoresorcinol from 4,6-bis(substituted)-phenylazoresorcinol at a high yield.

Inventors:
TOKUNAGA KENICHI (JP)
SIRATORI MOTOHITO (JP)
AKIMOTO KAZUHIKO (JP)
SUZUKI HIDEO (JP)
HASHIBA ISAO (JP)
Application Number:
PCT/JP1999/000268
Publication Date:
July 29, 1999
Filing Date:
January 25, 1999
Export Citation:
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Assignee:
NISSAN CHEMICAL IND LTD (JP)
TOKUNAGA KENICHI (JP)
SIRATORI MOTOHITO (JP)
AKIMOTO KAZUHIKO (JP)
SUZUKI HIDEO (JP)
HASHIBA ISAO (JP)
International Classes:
C07C213/02; C07C215/80; (IPC1-7): C07C215/80; B01J23/42; B01J23/44; B01J23/64; C07C213/02; C07C213/10
Foreign References:
JPH07242604A1995-09-19
JPH09194443A1997-07-29
JPH10168040A1998-06-23
Other References:
See also references of EP 1052244A4
Attorney, Agent or Firm:
Hanabusa, Tsuneo (Kandasurugadai 1-chome Chiyoda-ku Tokyo, JP)
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