| PATENT ASSIGNEE'S COUNTRY | UK |
| UPDATE | 06.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
R-C6H4-O-C6H4-NO2 crude prodt (contg < 85% title prodt & > 15% impurities of isomers or di-nitrated analogues) purification - Dissolving the mixt in aromatic hydrocarbon solvent - Recrystallising the prodt from soln Wherein the crystallisation soln contains < 25% loading of the compd & T to which the soln is cooled for crystallisation is < 30C; wherein after the addition of the crystallising solvent but before recrystallization, the crystallization soln is subjected to one wash with aq soln having acid pH R = 1-4C alkyl |
| PATENT PHOTOCOPY | Available on request |
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