- Polyhalogenonitrobenzenes and derived compounds part 4. Attempted fluorination of 1,2,3,4-tetrachloro-5,6-dinitrobenzene
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Attempted fluorination of 1,2,3,4-tetrachloro-5,6-dinitrobenzene with potassium fluoride to give 1,2,3,4-tetrafluoro-5,6-dinitrobenzene in DMF or sulpholane, or under solid/liquid phase transfer conditions in toluene using Aliquat 336, TBAI or 18-Crown-6 failed to yield any products resulting from displacement of Cl by F. Rather surprisingly, the two products obtained were pentachloronitrobenzene and pentachlorofluorobenzene.
- Heaton, Alan,Hill, Mark,Drakesmith, Frederick
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- LES FLUORATIONS COMPAREES DES CHLOROPYRIMIDINES ET DE LA CHLORO-S-TRIAZINE
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The fluorinations of tetrachloropyrimidine, 2,4,6-trichloropyrimidine and trichloro-s-triazine were carried out in sealed tubes with KF in presence of inert gas and then compared.The fluorinated derivatives C4FxClyN2 with x + y = 4, O - were investigated and compared; the molar yields were found to be always higher than 50percent in our experimental conditions.We compare with the fluorinations of 2,4 and 4,6-dichloropyrimidine.It is possible to obtain directlyin good proportions, such fluorinated derivatives as 5-chlorotrifluoropyrimidine, trifluoropyrimidine and others.At high temperature (4OO deg C for 16h), tetrachloropyrimidine, in presence of KF, gave products of pyrolysis and condensation such as the fluorinated derivatives of C6Cl6 and C5Cl5N: C6FCl5, C6F2Cl4... or C5FCl4N, C5F2Cl3N...
- Hitzke,J.
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- LA FLUORATION DE L'HEXACHLOROBENZENE ET DE LA PENTACHLOROPYRIDINE EN MILIEU DE FLUORURE DE POTASSIUM SOLIDE
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The fluorinations of hexachlorobenzene and pentachloropyridine were carried out in sealed tubes with KF in presence of inert gas; the fluorinated derivatives C6FxCly x + y = 6 0 - are investigated and compared; the molar yield varied from 45percent to 90percent.It is possible to get directly and selectively some fluorinated drivatives as C5Cl2F3N.The fluorinations in liquid KF-KCl and solid KF are compared.
- Hitzke, J.
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- METHOD FOR THE PRODUCTION OF 1,3,5-TRIFLUORO-2,4,6-TRICHLOROBENZENE FROM FLUOROBENZENE DERIVATIVES
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Method for the production of 1,3,5-trifluoro-2,4,6-trichlorobenzene from fluorobenzene, comprising steps A) and B): A) chlorination of fluorobenzene derivatives of formula (II), in which X = fluorine or H, Z = nitro, bromo or chloro and n = 0 or 1-4 and B) fluorination of the distillation residue and separation by distillation of the 1,3,5-trifluoro-2,4,6-trichlorobenzene thus produced.
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Page/Page column 8-9
(2008/06/13)
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- Preparation process of fluorine substituted aromatic compound
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A preparation process of a fluorine substituted aromatic compound comprising reacting an alkali metal or alkali earth metal salt of an aromatic compound having a hydroxy group with an organic fluorinating agent is disclosed. As a representative fluorinating agent, a bis-dialkylamino-difluoromethane compound, for example, 2,2′-difluoro-1,3-dimethylimidazolidine, is exemplified. According to the process, an industrially useful fluorinated aromatic compound, for example, a fluorobenzene, a fluorine substituted benzophenone, a fluorine substituted diarylsulfone can be prepared with ease in economy without specific equipment.
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