Preparation of substituted aromatic amines
US6229035A · kind A · utility
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25Claims
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Key dates
| Filing date | Jun 16, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jun 16, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F15/025
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for producing aromatic amines such as N-phenyl-p-phenylenediamine is disclosed wherein an amine substituted aromatic such as aniline is oxidized with oxygen or hydrogen peroxide in the presence of a preferred alkali metal pentacyano ferrate(II) complex made using water soluble ferrous salts with a non-oxidizing anion, preferably, ferrous sulfate, and containing various water soluble ligands, such as ammonia, mono alkyl amine, dialkyl amines, and trialkyl amines. The complex is subsequently catalytically reduced by hydrogenation using certain heterogeneous metal catalysts to yield the desired aromatic amine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.