EP1506163A1 - Method for the catalyst-free production of alkoxybenzonitriles - Google Patents
Method for the catalyst-free production of alkoxybenzonitrilesInfo
- Publication number
- EP1506163A1 EP1506163A1 EP03752756A EP03752756A EP1506163A1 EP 1506163 A1 EP1506163 A1 EP 1506163A1 EP 03752756 A EP03752756 A EP 03752756A EP 03752756 A EP03752756 A EP 03752756A EP 1506163 A1 EP1506163 A1 EP 1506163A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alcoholate
- reaction mixture
- reaction
- catalyst
- alkyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- 150000008359 benzonitriles Chemical class 0.000 claims abstract description 15
- 239000011541 reaction mixture Substances 0.000 claims abstract description 15
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 7
- 125000003118 aryl group Chemical group 0.000 claims abstract description 5
- 229910052794 bromium Inorganic materials 0.000 claims abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 5
- 239000011734 sodium Substances 0.000 claims abstract description 5
- QDRKDTQENPPHOJ-UHFFFAOYSA-N sodium ethoxide Chemical compound [Na+].CC[O-] QDRKDTQENPPHOJ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000007858 starting material Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000006467 substitution reaction Methods 0.000 claims description 5
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000001476 alcoholic effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 11
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 239000012467 final product Substances 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 5
- -1 aromatic nitriles Chemical class 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- GJNGXPDXRVXSEH-UHFFFAOYSA-N 4-chlorobenzonitrile Chemical compound ClC1=CC=C(C#N)C=C1 GJNGXPDXRVXSEH-UHFFFAOYSA-N 0.000 description 2
- XDJAAZYHCCRJOK-UHFFFAOYSA-N 4-methoxybenzonitrile Chemical compound COC1=CC=C(C#N)C=C1 XDJAAZYHCCRJOK-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000000543 intermediate Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- YOYAIZYFCNQIRF-UHFFFAOYSA-N 2,6-dichlorobenzonitrile Chemical compound ClC1=CC=CC(Cl)=C1C#N YOYAIZYFCNQIRF-UHFFFAOYSA-N 0.000 description 1
- YRGCKBHUZNQXEL-UHFFFAOYSA-N 2-chloro-6-methoxybenzonitrile Chemical compound COC1=CC=CC(Cl)=C1C#N YRGCKBHUZNQXEL-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 150000005224 alkoxybenzenes Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005695 dehalogenation reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002816 nickel compounds Chemical class 0.000 description 1
- 125000002560 nitrile group Chemical group 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 150000005181 nitrobenzenes Chemical class 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 229940127557 pharmaceutical product Drugs 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/30—Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
Definitions
- the present invention relates to a process for the catalyst-free preparation of alkoxybenzonitriles by substitution of monohalogenated starting compounds of a defined formula.
- Alkoxybenzonitriles are very important intermediates in the synthesis of numerous agricultural and pharmaceutical products.
- the starting compounds are not aromatic nitriles.
- halogenated benzonitriles are reacted with metal alcoholates, an expensive palladium or nickel compound being used in combination with a corresponding expensive ligand as a catalyst.
- the catalytic dehalogenation of halogenated aryls using a Pd / imidazole salt system according to Organometalips, 2001, 20, 6, 3607-361 2 is also known.
- Boiling temperature to 2-chloro-6-methoxybenzonitrile whereby a yield between 75 and 80% is achieved.
- this variant is limited to very activated nitriles.
- the object of the present invention is therefore to provide a process for the catalyst-free preparation of alkoxybenzonitriles.
- the target compounds should be obtained as directly as possible in good yields and purities and the use of expensive and environmentally harmful substances should be completely eliminated.
- the process according to the invention preferably further comprises one or more steps selected from cooling the reaction mixture to 10 ° C. to 40 ° C., in particular to room temperature, for example 18 to 27 ° C., adding water to the reaction mixture and / or separating off the end product. After the reaction mixture has been kept at the final temperature, the reaction mixture is particularly preferably cooled to 10 ° C. to 40 ° C., in particular to room temperature, stirred after the addition of water and finally the end product is separated off.
- the radical Y can be arranged ortho, metha or para to the CN grouping.
- Y represents an alkyl group
- the alkyl group can be straight-chain or branched.
- Y is aryl, it is preferably a C 4 -C 30 , more preferably a C 5 -C 20 and most preferably a C 6 -C 15 aryl radical.
- the monohalogenated benzonitriles used are preferably chlorinated or brominated benzonitriles in the 2- or 4-position, the preparation of which is well known from the literature.
- Sodium methylate or sodium ethylate are to be regarded as preferred alcoholates.
- the reaction is carried out at temperatures between 90 and 250.degree. C., but preferably temperatures which have been found to be particularly suitable are between 100 and 150.degree. C. and particularly preferably between 115 and 140.degree.
- the reaction mixture should be kept for a period of 2 to 10 hours and in particular for 3 to 5 hours at the respective end temperature within the scope of the invention.
- the pressure naturally increases in a closed system, as autoclaves represent, pressure ranges of usually 2 to 20 bar being acceptable and a pressure of about 3 to 5 bar being recommended.
- reaction mixture can also be kept under reflux for a long time, for example three hours, and only then can the reaction mixture be reacted at the final temperature for a further 2 to 3 hours.
- the present invention preferably provides for the reaction to be carried out under an inert gas and in particular under a nitrogen atmosphere.
- the amount of alcoholate used in the claimed process is not critical and can be between 70 mol% and 400 mol%, based on the monohalogenated benzonitrile used. However, it is recommended that the amount of alcoholate be between 1 00 and 200 mol%, based on the halogenated benzonitrile used, and especially between 105 and 1 1 5 mol%.
- the metal alcoholate is used in the form of a corresponding alcoholic solution.
- concentration of this solution is also not critical and can be between 1 5 and 50 wt .-%. However, it is recommended that the concentration of the alcoholate solution to be used be between 20 and 40% by weight and in particular between 25 and 35% by weight.
- the subsequent separation of the product is carried out according to the usual methods, with filtering off for solid products and phase separation for liquid products, of course, being recommended. Finally, if necessary, the product can be freed of the residual moisture by mild temperatures of approx. 30 to 50 ° C.
- the reaction mixture at the end of the reaction is a suspension of sodium and / or potassium salt and alkoxybenzonitrile fractions in the corresponding alcohol.
- the product can easily be separated from this system by adding water and stirring.
- the salt completely dissolves and, in the case of solid benzonitrile derivatives, the product precipitates. It is particularly advantageous to cool the suspension thus obtained with thorough mixing, the product being obtained practically quantitatively.
- the crystals obtained in this way can be separated from the liquid phase in any conventional manner.
- the product is usually dried at pressures between 0.1 and 1000 mbar and at temperatures between 20 and 40 ° C, with pressures between 10 and 20 mbar and temperatures between 25 and 35 ° C being particularly recommended.
- the method according to the invention is characterized by a very simple technical feasibility and also by a high degree of compatibility with the world.
- the only by-product of the reaction is sodium or potassium halides, which further underlines the environmental compatibility and economy of the proposed process.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10222330 | 2002-05-17 | ||
DE10222330A DE10222330A1 (en) | 2002-05-17 | 2002-05-17 | Non-catalytic production of alkoxybenzonitriles, useful as intermediates for the synthesis of agrochemicals and pharmaceuticals, comprises substitution of mono-halogenated starting compounds with an alcoholate |
PCT/EP2003/005176 WO2003097584A1 (en) | 2002-05-17 | 2003-05-16 | Method for the catalyst-free production of alkoxybenzonitriles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1506163A1 true EP1506163A1 (en) | 2005-02-16 |
Family
ID=29285603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03752756A Withdrawn EP1506163A1 (en) | 2002-05-17 | 2003-05-16 | Method for the catalyst-free production of alkoxybenzonitriles |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060025624A1 (en) |
EP (1) | EP1506163A1 (en) |
JP (1) | JP2005530793A (en) |
DE (1) | DE10222330A1 (en) |
WO (1) | WO2003097584A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100351226C (en) * | 2006-06-09 | 2007-11-28 | 武汉大学 | Method for preparing 2,6- dialkoxy benzene nitrile |
CN100386309C (en) * | 2006-06-09 | 2008-05-07 | 武汉大学 | Method for preparing 2- chlor-6- dialkoxy benzene nitrile |
CN100386308C (en) * | 2006-06-09 | 2008-05-07 | 武汉大学 | Method for preparing 3- chlor-4- dialkoxy benzene nitrile |
CN102311364B (en) * | 2011-09-30 | 2014-07-09 | 江苏联化科技有限公司 | Preparation method of o(p)-hydroxybenzonitrile |
WO2014186981A1 (en) * | 2013-05-24 | 2014-11-27 | 江苏联化科技有限公司 | Method for preparing o(p)-hydroxybenzonitrile |
DE102014007527A1 (en) | 2014-05-23 | 2015-12-17 | Alzchem Ag | Process for the preparation of alkoxybenzonitriles |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5965766A (en) * | 1996-09-24 | 1999-10-12 | Rohm And Haas Company | Process for synthesizing benzoic acids |
US5917079A (en) * | 1996-09-24 | 1999-06-29 | Rohm And Haas Company | Process for synthesizing benzoic acids |
US5847166A (en) * | 1996-10-10 | 1998-12-08 | Massachusetts Institute Of Technology | Synthesis of aryl ethers |
JPH10237016A (en) * | 1997-02-21 | 1998-09-08 | Nippon Oil Co Ltd | Production of optically active compound |
-
2002
- 2002-05-17 DE DE10222330A patent/DE10222330A1/en not_active Withdrawn
-
2003
- 2003-05-16 JP JP2004505317A patent/JP2005530793A/en active Pending
- 2003-05-16 US US10/515,090 patent/US20060025624A1/en not_active Abandoned
- 2003-05-16 WO PCT/EP2003/005176 patent/WO2003097584A1/en not_active Application Discontinuation
- 2003-05-16 EP EP03752756A patent/EP1506163A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO03097584A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2005530793A (en) | 2005-10-13 |
WO2003097584A1 (en) | 2003-11-27 |
DE10222330A1 (en) | 2003-11-27 |
US20060025624A1 (en) | 2006-02-02 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20041112 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SANS, JUERGEN Inventor name: GOMEZ ANDREU, MARIO Inventor name: THALHAMMER, FRANZ |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SANS, JUERGEN Inventor name: THALHAMMER, FRANZ Inventor name: GOMEZ ANDREU, MARIO |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20061201 |