WO1991006523A1 - Verfahren zur herstellung von fluorbenzolen und fluortoluolen - Google Patents
Verfahren zur herstellung von fluorbenzolen und fluortoluolen Download PDFInfo
- Publication number
- WO1991006523A1 WO1991006523A1 PCT/EP1990/001763 EP9001763W WO9106523A1 WO 1991006523 A1 WO1991006523 A1 WO 1991006523A1 EP 9001763 W EP9001763 W EP 9001763W WO 9106523 A1 WO9106523 A1 WO 9106523A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- formula
- hydrogen
- catalyst
- reaction
- fluorotoluenes
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/361—Preparation of halogenated hydrocarbons by reactions involving a decrease in the number of carbon atoms
Definitions
- the present invention relates to a process for the preparation of optionally substituted fluorobenzenes and / or optionally substituted fluorotoluenes from the corresponding fluorobenzaldehydes.
- the given all substituted fluorobenzenes and fluorotoluenes are important intermediates, e.g. for the manufacture of pharmaceutical products.
- fluorobenzenes have been prepared from the corresponding optionally substituted anilines by diazotization and subsequent replacement of the diazo group by fluorine.
- the synthesis of fluorobenzene by diazotization of aniline hydrochloride, conversion of the benzene diazonium chloride obtained into the tetrafluoroborate and subsequent heating have long been known (G. Balz and G. Schiemann, Ber. 6O [1927] 1186, 1188; DT Flood, Org. Synth. Coll. Vol. II [1943] 295).
- 1,3-difluorobenzene could be obtained analogously by heating benzene-1,3-bis-diazonium tetrafluoroborate in a yield of 31%, based on m-phenylenediamine as the starting compound
- Fluorinated toluenes are obtained analogously from the C-methyl-substituted anilines.
- the invention now makes it possible to optionally produce fluorobenzenes or fluorotoluenes from the fluorobenzaldehydes.
- the present invention now relates to a process using the benzaldehydes of the general formula (II) (see claim 1), in which R, R and R J independently represent hydrogen, fluorine, chlorine and / or C - C3-alkyl, where at least one of these radicals is fluorine, and S ⁇ and S 2 are independently hydrogen and / or radicals which reduce the electron density on the aromatic nucleus, such as chlorine, but preferably hydrogen, on a catalyst activated by treatment with hydrogen of at least one Transition metal of the VII. to VIII.
- R, R and R J independently represent hydrogen, fluorine, chlorine and / or C - C3-alkyl, where at least one of these radicals is fluorine
- S ⁇ and S 2 are independently hydrogen and / or radicals which reduce the electron density on the aromatic nucleus, such as chlorine, but preferably hydrogen, on a catalyst activated by treatment with hydrogen of at least one Transition metal of the VII. to VIII.
- Reactions involved compounds inert carrier gas, so there is primarily a decarbonylation to the corresponding fluorobenzenes, while hydrogen is used as a carrier gas, especially a hydrogenation to the corresponding fluorotoluenes.
- hydrogen is used as a carrier gas, especially a hydrogenation to the corresponding fluorotoluenes.
- the presence of hydrogen is necessary for the production of fluorotoluenes from fluorobenzaldehydes.
- the catalysts suitable for the process according to the invention contain one or more elements from subgroups VII to VIII, ie manganese, rhenium, iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium or platinum, preferably platinum and / or cobalt and / or platinum and rhenium. They can be applied to conventional carriers, such as Al 9 O3, silica gel or activated carbon. In principle, all conventional zeolites which have been doped with an element from subgroup VII to VIII by impregnation, ion exchange or other conventional methods can also serve as catalysts.
- the catalysts used according to the invention are advantageously used in the form of compacts or extrudates. Fluid bed catalysts can also be used.
- the inventive method is preferably carried out at temperatures of 180 to 440 ° C. It can be carried out both in the liquid phase and, which is preferred, in the gas phase.
- a carrier gas such as nitrogen or CO2 or, especially in the intended production of fluorotoluenes, hydrogen can also be added.
- the total pressure is generally between 0.1 and 100 bar, preferably between 1 and 20 bar. However, it is particularly preferred to work at atmospheric pressure or the dynamic pressure which results from the promotion of the gaseous starting materials by the fixed catalyst, for example.
- ⁇ pace velocity is preferably between 0.1 and 10 h.
- the gas mixture leaving the reaction zone can be worked up by conventional methods of material separation, e.g. by cooling with fractional condensation.
- reaction products are preferably obtained purely by distillation.
- U conversion, S ⁇ pg means the selectivity 1,3-difluorobenzene and Spprr- the selectivity 2,4-difluorotoluene.
- S Se CFB l ect i v ity of 1-chloro-3-fluoro-benzene.
- S CFT Se l ective i 't ssen of 2-chloro-6-fluoro-toluene
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3935861.5 | 1989-10-27 | ||
DE19893935861 DE3935861A1 (de) | 1989-10-27 | 1989-10-27 | Verfahren zur herstellung von fluorbenzolen und fluortoluolen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991006523A1 true WO1991006523A1 (de) | 1991-05-16 |
Family
ID=6392389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/001763 WO1991006523A1 (de) | 1989-10-27 | 1990-10-18 | Verfahren zur herstellung von fluorbenzolen und fluortoluolen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0496752A1 (de) |
JP (1) | JPH04506356A (de) |
CA (1) | CA2070386A1 (de) |
DE (1) | DE3935861A1 (de) |
WO (1) | WO1991006523A1 (de) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3824141A1 (de) * | 1988-07-16 | 1990-01-18 | Hoechst Ag | Verfahren zur herstellung von fluorbenzolen |
-
1989
- 1989-10-27 DE DE19893935861 patent/DE3935861A1/de not_active Withdrawn
-
1990
- 1990-10-18 CA CA 2070386 patent/CA2070386A1/en not_active Abandoned
- 1990-10-18 WO PCT/EP1990/001763 patent/WO1991006523A1/de not_active Application Discontinuation
- 1990-10-18 EP EP19900914912 patent/EP0496752A1/de active Pending
- 1990-10-18 JP JP51391190A patent/JPH04506356A/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3824141A1 (de) * | 1988-07-16 | 1990-01-18 | Hoechst Ag | Verfahren zur herstellung von fluorbenzolen |
Non-Patent Citations (1)
Title |
---|
Collection of Czechoslovak Chemical Communications, Band 37, 1972 (Praag, CH) J. Smolik et al.: "Decarbonylation of aromatic aldehydes on platinum metal catalysts", Seiten 3042-3051 * |
Also Published As
Publication number | Publication date |
---|---|
EP0496752A1 (de) | 1992-08-05 |
DE3935861A1 (de) | 1991-05-02 |
CA2070386A1 (en) | 1991-04-28 |
JPH04506356A (ja) | 1992-11-05 |
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