EP2438214A1 - Verfahren zur anodischen kreuz-dehydrodimerisierung von arenen - Google Patents
Verfahren zur anodischen kreuz-dehydrodimerisierung von arenenInfo
- Publication number
- EP2438214A1 EP2438214A1 EP10724436A EP10724436A EP2438214A1 EP 2438214 A1 EP2438214 A1 EP 2438214A1 EP 10724436 A EP10724436 A EP 10724436A EP 10724436 A EP10724436 A EP 10724436A EP 2438214 A1 EP2438214 A1 EP 2438214A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- group
- arenes
- alkyl
- electrolysis
- mediators
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/29—Coupling reactions
Definitions
- the invention relates to a process for the preparation of biaryls, which is carried out by anodic cross-dehydrodimerization of substituted phenols with arenes in the presence of partially and / or perfluorinated mediators and a conductive salt.
- the general strategy of oxidative cross-coupling of arenes utilizes the reactivity of a reagent with a component (A) of the coupling partners (A and B) to form an intermediate (I).
- the entry into the reaction cascade on the first component (A) either by special neighboring groups, which allows the insertion of a strong oxidizing metal ion such as Pd 2+ in a C-H bond.
- the subsequent cross-coupling usually uses halogen-substituted reactant (B).
- the specific reactivity of indoles and fluorinated arenes towards transition metals can also be used for such a transformation.
- hypervalent iodine compounds such as PIFA (phenyliodine bis (trifluoroacetates) and derivatives
- PIFA phenyliodine bis (trifluoroacetates) and derivatives
- Oxidative cross-coupling of phenols with anilines or other electron-rich aromatic moieties can be achieved in a few cases either by certain Lewis acid additives as described by G. Satori, R. Maggi, F. Bigi, A. Arienti, G. Casnati, in Tetrahedron, 1992 , 43, 9483 or achieved by prior co-crystallisation.
- preorganization via hydrogen bonding occurs as described by M. Smrcina, S. Vyskocil, AB Abbott, P. Kocovsky, J. Org. Chem. 1994, 59, 2156; K. Ding, Q. Xu, Y. Wang, J. Liu, Z. Yu, B. Du, Y. Wu, H.
- the object of the present invention is to provide a process which enables the anodic cross-dehydrodimerization of substituted aryl alcohols with arenes without having to use expensive catalysts and compounds having specific leaving groups and without generating toxic waste products.
- the process according to the invention is advantageous if the OH group of the aryl alcohols used is bonded directly to the aromatic compound.
- the process according to the invention is advantageous if the substituted aryl alcohols used can be mono- or binuclear.
- the process of the invention is advantageous if the substituted arenes used can be mononuclear or binuclear.
- the process according to the invention is advantageous if the dimerization takes place ortho to the alcohol group of the aryl alcohol.
- the process according to the invention is advantageous if the mediators used are partially and / or perfluorinated alcohols and / or acids.
- the process according to the invention is advantageous if 1, 1, 1, 3,3,3-hexafluoroisopropanol and / or trifluoroacetic acid are used as mediators.
- the process according to the invention is advantageous if the conductive salts used are those which are selected from the group of alkali metal, alkaline earth metal, tetra (C 1 to C 6 alkyl) ammonium salts.
- the counterions of the conducting salts are selected from the group consisting of sulfate, hydrogensulfate, alkyl sulfates, aryl sulfates, halides, phosphates, carbonates, alkyl phosphates, alkyl carbonates, nitrate, alcoholates, tetrafluoroborate, hexafluorophosphate and perchlorate.
- the process according to the invention is advantageous if no further solvent is used for the electrolysis.
- the inventive method wherein a diamond anode and a nickel cathode are used.
- the method according to the invention is advantageous if the diamond electrode is a boron-doped diamond electrode.
- the process according to the invention is advantageous if a flow cell is used for the electrolysis.
- the process according to the invention is advantageous when current densities of 1 to 1000 mA / cm 2 are used.
- the process according to the invention is advantageous if the electrolysis is carried out at temperatures in the range from -20 to 100 ° C. and atmospheric pressure.
- the process according to the invention is advantageous if 4-methylguajacol is used as the aryl alcohol.
- aryl alcohol is understood as meaning aromatic alcohols in which the hydroxyl group is bonded directly to the aromatic nucleus.
- the aromatic which is based on the aryl alcohol, may be mononuclear or polynuclear.
- the aromatic is preferably mononuclear (phenol derivatives) of the formula I or binuclear (naphthol derivatives) of the formula II or III, in particular mononuclear.
- An sp 2 - hybridized ring carbon atom of the aromatic, which underlies the aryl alcohol, can also be replaced by a nitrogen atom (pyridine, quinoline or isoquinoline derivative).
- the aryl alcohols may also carry further substituents R1 to R7.
- substituents R 1 to R 7 are independently selected from the group of C 1 -C 10 -alkyl groups, halogens, hydroxyl, C 1 -C 10 -alkoxy groups, alkylene or arylene radicals interrupted by oxygen or sulfur, C 1 -C 10 -alkoxycarboxyl, amino, nitrile, nitro and Ci-Cio-alkoxycarbamoyl.
- the substituents R 1 to R 7 are preferably selected from the group of methyl, ethyl, n-propyl, isopropyl, n-butyl, trifluoromethyl, fluorine, chlorine, bromine, iodine, hydroxyl, methoxy, ethoxy, methylene, ethylene, propylene len, isopropylene, benzylidene, amino, nitrile, nitro.
- the substituents R1 to R7 are particularly preferably selected from the group of methyl, methoxy, methylene, ethylene, trifluoromethyl, fluorine and bromine. Very particular preference is given to 4-alkyl- and 2,4-dialkyl-substituted phenols.
- Suitable substrates for the electrodimerization according to the present invention are, in principle, all arenes, provided that they are capable of cross-dehydrodimerization owing to their spatial structure and steric requirements.
- Arene in the context of the present invention is understood as meaning aromatic carbon compounds and heteroaromatics. In this case, preference is given to carbon compounds and heteroaromatics of the general formula IV to VIII.
- the aromate on which the arene is based may be mononuclear or polynuclear.
- the aromatic is preferably mononuclear (benzene derivatives) or binuclear (naphthalene derivatives), in particular mononuclear.
- the arenes can also carry further substituents.
- Preferred arenes are those of the formula IV to VIII.
- An sp 2 -hybridized ring carbon atom of the arenes Moreover, according to formulas IV and V, it may be replaced by a nitrogen atom (pyridine, quinoline or iso
- R8 to R 37 which are independently selected from the group of Ci-Cio-alkyl groups, halogens, hydroxy, Ci-Cio-alkoxy, interrupted by oxygen or sulfur alkylene or arylene radicals, C1-C10 alkoxycarboxyl, amino -, nitrile, nitro and Ci-Cio-Alkoxycarbamoylreste.
- the substituents are preferably selected from the group of methyl, ethyl, n-propyl, isopropyl, n-butyl, trifluoromethyl, fluorine, chlorine, bromine, iodine, hydroxy, methoxy, ethoxy, methylene, ethylene, propylene, isopropylene, benzylidene , Amino, nitrile, nitro.
- the substituents are particularly preferably selected from the group of methyl, methoxy, methylene, ethylene, trifluoromethyl, fluorine and bromine.
- Arenes are very particularly preferably selected from the group of monosubstituted or polysubstituted benzene derivatives, singly or multiply substituted naphthalene derivatives, singly or multiply substituted benzodioxole derivatives, singly or multiply substituted furan derivatives, singly or multiply substituted indole derivatives.
- the preparation of the biaryl is carried out electrochemically, wherein the corresponding aryl alcohol is oxidized anodically.
- the process according to the invention is referred to below as electrodimerization. It has surprisingly been found that the biaryls are produced selectively and in high yield by the process according to the invention using mediators. It has furthermore been found that undivided cell structures and solvent-free methods can be used by the method according to the invention.
- the processing and recovery of the desired biaryle is very simple.
- the electrolyte solution is worked up by general separation methods.
- the electrolyte solution is generally first distilled and recovered the individual compounds in the form of different fractions separately. Further purification can be carried out, for example, by crystallization, distillation, sublimation or chromatographic.
- a diamond electrode is used. These diamond electrodes are formed by applying one or more diamond layers to a substrate.
- Possible support materials are niobium, silicon, tungsten, titanium, silicon carbide, tantalum, graphite or ceramic supports such as titanium suboxide.
- a support of niobium, titanium or silicon is preferred for the process according to the invention, very particular preference is given to a support of niobium.
- Electrodes selected from the group of iron, steel, stainless steel, nickel, noble metals such as platinum, graphite, carbon materials such as the diamond electrodes are used for the process according to the invention.
- Suitable anode materials are, for example, noble metals such as platinum or metal oxides such as ruthenium or chromium oxide or mixed oxides of the type RuO x TiO x and diamond electrodes.
- Preferred are graphite, carbon, glassy carbon or diamond electrodes, more preferably diamond electrodes.
- a diamond electrode which is also doped with further elements is preferred. Boron and nitrogen are preferred as doping elements.
- the process according to the invention with a boron-doped diamond electrode (BDD electrode) as anode is very particularly preferred.
- the cathode material is selected from the group of iron, steel, stainless steel, nickel, precious metals such as platinum, graphite, carbon, glassy carbon materials and diamond electrodes.
- the cathode is selected from the group of nickel, steel and stainless steel.
- the cathode is particularly preferably made of nickel.
- Partially and / or perfluorinated alcohols and / or acids preferably perfluorinated alcohols and carboxylic acids, very particularly preferably 1, 1, 1, 3, 3, 3-hexafluoroisopropanol or trifluoroacetic acid are used as mediators in the process according to the invention. No additional solvents are required in the electrolyte.
- electrolysis is carried out in the usual, known in the art electrolysis cells. Suitable electrolysis cells are known to the person skilled in the art. Preferably, one works continuously in undivided flow cells or discontinuously in beaker cells.
- bipolar switched capillary gap cells or plate stacked cells in which the electrodes are designed as plates and are arranged plane-parallel as described in Ullmann's Encyclopedia of Industrial Chemistry, Electrochemistry, 1999 electronic release, Sixth Edition, Wiley-VCH Weinheim (doi :
- the current densities at which the process is carried out are generally 1 to 1000, preferably 5 to 100 mA / cm 2 .
- the temperatures are usually from -20 to 100 ° C., preferably from 10 to 60 ° C.
- the reaction is generally carried out under atmospheric pressure. Higher pressures are preferably used when operating at higher temperatures to avoid boiling of the co-solvents or mediators.
- the aryl alcohol compound and the arene are dissolved in a suitable solvent.
- a suitable solvent preferably solvents from the group of polar protic and polar aprotic solvents, are suitable.
- the aryl alcohol compound itself serves as a solvent and reagent.
- polar aprotic solvents include nitriles, amides, carbonates, ethers, ureas, chlorinated hydrocarbons.
- particularly preferred polar aprotic solvents include acetonitrile, dimethylformamide, dimethyl sulfoxide, propylene carbonate and dichloromethane.
- polar protic solvents include alcohols, carboxylic acids and amides.
- particularly preferred polar protic solvents include methanol, ethanol, propanol, butanol, pentanol and hexanol. These may also be partially or fully halogenated, such as 1, 1, 1, 3,3,3-hexafluoroisopropanol (HFIP) or trifluoroacetic acid (TFA).
- the electrolysis solution is added to customary cosolvents.
- these are the inert solvents customary in organic chemistry with a high oxidation potential. Examples include its dimethyl carbonate, propylene carbonate, tetrahydrofuran, dimethoxyethane, acetonitrile or dimethylformamide.
- Conducting salts which are contained in the electrolysis solution are generally alkali metal, alkaline earth metal, tetra (C 1 to C 6 alkyl) ammonium, preferably tri (C 1 to C 6) alkyl) -methylammoniumsalze.
- Suitable counterions are sulfates, hydrogen sulfates, alkyl sulfates, aryl sulfates, halides, phosphates, carbonates, alkyl phosphates, alkyl carbonates, nitrates, alkoxides, tetrafluoroborate, hexafluorophosphate or perchlorate.
- the acids derived from the abovementioned anions are suitable as conductive salts.
- MTBS methyltributylammonium methylsulfates
- MTES methyltriethylammonium methylsulfate
- TABF tetrabutylammonium, tetrafluoroborate
- Example 1 Anodic oxidation of 4-methyl guaiacol and substituted benzenes at a BDD anode with hexafluoroisopropanol
- the electrolyte consisting of substituted benzene and 4-methyl guaiacol in a molar ratio of 10: 1 according to Table 1, 0.68 g Methyltriethylammoniummethylsulfat (MTES) and 30 ml of hexafluoroisopropanol are initially introduced.
- MTES Methyltriethylammoniummethylsulfat
- the anode surface is completely covered with electrolyte.
- the cathode used is a nickel mesh which is immersed in the electrolyte at a distance of 1 cm from the BDD anode.
- the cell is heated in a sand bath (50 ° C.).
- the electrolysis is carried out under galvanostatic control and a current density of 4.7 mA / cm 2 .
- the reaction is stopped after reaching the set charge limit (1 F per mole of 4-methylguajacol).
- the cooled reaction mixture is transferred with about 20 mL of toluene in a flask from which toluene and the fluorinated solvent used are almost completely removed on a rotary evaporator. Excess starting materials can be recovered by short path distillation at reduced pressure. By column chromatographic purification of the distillation residue on silica gel 60 and subsequent washing with a little cold n-heptane, the product can be isolated as a colorless, crystalline solid.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10724436.0A EP2438214B1 (de) | 2009-06-05 | 2010-06-01 | Verfahren zur anodischen kreuz-dehydrodimerisierung von arenen |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09162074 | 2009-06-05 | ||
PCT/EP2010/057617 WO2010139685A1 (de) | 2009-06-05 | 2010-06-01 | Verfahren zur anodischen kreuz-dehydrodimerisierung von arenen |
EP10724436.0A EP2438214B1 (de) | 2009-06-05 | 2010-06-01 | Verfahren zur anodischen kreuz-dehydrodimerisierung von arenen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2438214A1 true EP2438214A1 (de) | 2012-04-11 |
EP2438214B1 EP2438214B1 (de) | 2013-05-29 |
Family
ID=42357545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10724436.0A Not-in-force EP2438214B1 (de) | 2009-06-05 | 2010-06-01 | Verfahren zur anodischen kreuz-dehydrodimerisierung von arenen |
Country Status (5)
Country | Link |
---|---|
US (1) | US8747646B2 (de) |
EP (1) | EP2438214B1 (de) |
JP (1) | JP5705216B2 (de) |
CN (1) | CN102459706B (de) |
WO (1) | WO2010139685A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2438215A1 (de) * | 2009-06-05 | 2012-04-11 | Basf Se | Verfahren zur herstellung von unsymmetrischen biarylalkoholen |
US9340884B2 (en) | 2010-12-15 | 2016-05-17 | Basf Se | Process for the electrochemical fluorination of organic compounds |
DE102014202274B4 (de) | 2013-03-07 | 2016-11-10 | Evonik Degussa Gmbh | Elektrochemisches Verfahren zur Kupplung von Phenol mit Anilin |
DE102013203866A1 (de) * | 2013-03-07 | 2014-09-11 | Evonik Industries Ag | Elektrochemische Kupplung eines Phenols mit einem Naphthol |
DE102013203867A1 (de) * | 2013-03-07 | 2014-09-11 | Evonik Industries Ag | Elektrochemische Kupplung von Anilinen |
DE102013203865A1 (de) * | 2013-03-07 | 2014-09-11 | Evonik Industries Ag | Elektrochemische Kupplung zweier Phenole, welche sich in ihrem Oxidationspotential unterscheiden |
DE102013211745A1 (de) | 2013-06-21 | 2014-12-24 | Evonik Industries Ag | Elektrochemisches Verfahren zur Herstellung von symmetrischen Biphenolen unter Verwendung von Essigsäure als Elektrolyt |
DE102015216001A1 (de) * | 2015-08-21 | 2017-02-23 | Evonik Degussa Gmbh | Verfahren zur Herstellung von unsymmetrischen OCO-Pincerliganden aus der Gruppe der m-Terphenylverbindungen |
CN107089895B (zh) * | 2017-05-05 | 2020-02-18 | 乐山师范学院 | 一种卤代芳烃电离放电偶联制备偶联芳烃的方法 |
EP3489390A1 (de) * | 2017-11-27 | 2019-05-29 | Evonik Degussa GmbH | Elektrochemisches verfahren zur o-c-kupplung von ungeschützten phenolen mit optisch reinen arylaminen |
EP3489392A1 (de) * | 2017-11-27 | 2019-05-29 | Evonik Degussa GmbH | Verfahren zur elektrochemischen kupplung von phenol mit benzofuran an position 2 und anschliessender umlagerung zum 3-phenyl-benzofuran unter austausch der substituenten |
EP3489391A1 (de) * | 2017-11-27 | 2019-05-29 | Evonik Degussa GmbH | Verfahren zur elektrochemischen kupplung von phenol mit benzofuran an position 3 und anschliessender umlagerung zum 3-phenyl-benzofuran unter austausch der substituenten |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3271278A (en) * | 1961-12-29 | 1966-09-06 | Monsanto Co | Electrolytic reductive coupling of aromatic compounds |
US4101391A (en) | 1976-01-05 | 1978-07-18 | Monsanto Company | Electrolytic oxidative methyl-methyl coupling of cresol salts |
JPH0243388A (ja) * | 1988-08-03 | 1990-02-13 | Mitsubishi Kasei Corp | 4,4’−ジヒドロキシビフェニル類の製造法 |
JPH0247284A (ja) * | 1988-08-04 | 1990-02-16 | Mitsubishi Kasei Corp | 4,4’−ジヒドロキシビフェニル類の製造方法 |
DE19641344A1 (de) * | 1995-10-17 | 1997-04-24 | Basf Ag | Verfahren zur Herstellung von Biarylen |
DE19911746A1 (de) * | 1999-03-16 | 2000-09-21 | Basf Ag | Diamantelektroden |
JP2003093523A (ja) * | 2001-09-25 | 2003-04-02 | World Union Kk | 健康パッド |
DE102005003012A1 (de) * | 2005-01-21 | 2006-07-27 | Basf Ag | Anodische Dimerisierung von Hydroxy-substituierten Aromaten |
EP2318569B1 (de) | 2008-09-01 | 2012-03-28 | Basf Se | Verfahren zur anodischen dehydrodimerisierung von substituierten phenolen |
EP2438215A1 (de) * | 2009-06-05 | 2012-04-11 | Basf Se | Verfahren zur herstellung von unsymmetrischen biarylalkoholen |
-
2010
- 2010-06-01 JP JP2012513594A patent/JP5705216B2/ja not_active Expired - Fee Related
- 2010-06-01 CN CN201080024572.3A patent/CN102459706B/zh not_active Expired - Fee Related
- 2010-06-01 EP EP10724436.0A patent/EP2438214B1/de not_active Not-in-force
- 2010-06-01 WO PCT/EP2010/057617 patent/WO2010139685A1/de active Application Filing
- 2010-06-01 US US13/375,495 patent/US8747646B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2010139685A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010139685A1 (de) | 2010-12-09 |
JP5705216B2 (ja) | 2015-04-22 |
CN102459706B (zh) | 2015-02-11 |
US20120080320A1 (en) | 2012-04-05 |
CN102459706A (zh) | 2012-05-16 |
EP2438214B1 (de) | 2013-05-29 |
US8747646B2 (en) | 2014-06-10 |
JP2012528938A (ja) | 2012-11-15 |
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