Process for reducing aromatic halo-dinitro-diols in the presence of hydrogen halide
US5360932A · kind A · utility
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14Claims
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Key dates
| Filing date | Jan 11, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Jan 11, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An aromatic diamino-diol (such as 4,6-diaminoresorcinol) is made by reducing an aromatic halo-dinitro-diol (such as 2-halo-4,6-dinitroresorcinol) with molecular hydrogen in an aqueous mixture containing a noble metal hydrogenation catalyst, an aqueous solvent and about 2 moles of hydrogen halide per mole of aromatic halo-dinitro-diol, plus an additional quantity sufficient to provide a 0.75 to 4 molar solution of the hydrogen halide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.