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)
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:
Assignee:
NISSAN CHEMICAL IND LTD (JP)
TOKUNAGA KENICHI (JP)
SIRATORI MOTOHITO (JP)
AKIMOTO KAZUHIKO (JP)
SUZUKI HIDEO (JP)
HASHIBA ISAO (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:
JPH07242604A | 1995-09-19 | |||
JPH09194443A | 1997-07-29 | |||
JPH10168040A | 1998-06-23 |
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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