EP0000218B1 - Process for the isolation of 1,4,7,10,13,16-hexaoxacyclooctadecane - Google Patents
Process for the isolation of 1,4,7,10,13,16-hexaoxacyclooctadecane Download PDFInfo
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- EP0000218B1 EP0000218B1 EP78200037A EP78200037A EP0000218B1 EP 0000218 B1 EP0000218 B1 EP 0000218B1 EP 78200037 A EP78200037 A EP 78200037A EP 78200037 A EP78200037 A EP 78200037A EP 0000218 B1 EP0000218 B1 EP 0000218B1
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- Prior art keywords
- crown
- nitromethane
- complex
- ether
- hexaoxacyclooctadecane
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- XEZNGIUYQVAUSS-UHFFFAOYSA-N 18-crown-6 Chemical compound C1COCCOCCOCCOCCOCCO1 XEZNGIUYQVAUSS-UHFFFAOYSA-N 0.000 title claims description 93
- 238000000034 method Methods 0.000 title claims description 26
- 238000002955 isolation Methods 0.000 title claims description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 65
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 claims description 49
- 239000002904 solvent Substances 0.000 claims description 33
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 24
- 229920000570 polyether Polymers 0.000 claims description 22
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 claims description 12
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical group C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 150000004292 cyclic ethers Chemical group 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 150000001983 dialkylethers Chemical group 0.000 claims description 4
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical group C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 34
- 238000002474 experimental method Methods 0.000 description 13
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 12
- 239000004721 Polyphenylene oxide Substances 0.000 description 11
- 239000002244 precipitate Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000001103 potassium chloride Substances 0.000 description 6
- 235000011164 potassium chloride Nutrition 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000011541 reaction mixture Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000004821 distillation Methods 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000010668 complexation reaction Methods 0.000 description 3
- ZNSMNVMLTJELDZ-UHFFFAOYSA-N Bis(2-chloroethyl)ether Chemical compound ClCCOCCCl ZNSMNVMLTJELDZ-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000012047 saturated solution Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- AGYUOJIYYGGHKV-UHFFFAOYSA-N 1,2-bis(2-chloroethoxy)ethane Chemical compound ClCCOCCOCCCl AGYUOJIYYGGHKV-UHFFFAOYSA-N 0.000 description 1
- OOTYQRGBXHSKRG-UHFFFAOYSA-N 1,4,7,10,13,16,19,22,25,28,31,34-dodecaoxacyclohexatriacontane Chemical compound C1COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO1 OOTYQRGBXHSKRG-UHFFFAOYSA-N 0.000 description 1
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 1
- BPIUIOXAFBGMNB-UHFFFAOYSA-N 1-hexoxyhexane Chemical compound CCCCCCOCCCCCC BPIUIOXAFBGMNB-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 150000008045 alkali metal halides Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000001246 bromo group Chemical group Br* 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- IIRDTKBZINWQAW-UHFFFAOYSA-N hexaethylene glycol Chemical compound OCCOCCOCCOCCOCCOCCO IIRDTKBZINWQAW-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 125000002346 iodo group Chemical group I* 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006384 oligomerization reaction Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- LPNYRYFBWFDTMA-UHFFFAOYSA-N potassium tert-butoxide Chemical compound [K+].CC(C)(C)[O-] LPNYRYFBWFDTMA-UHFFFAOYSA-N 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000006798 ring closing metathesis reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- -1 which was sucked off Chemical compound 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 150000003738 xylenes Chemical class 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D323/00—Heterocyclic compounds containing more than two oxygen atoms as the only ring hetero atoms
Definitions
- the invention relates to a process for the isolation of 1,4,7,10,13,16-hexaoxacydooctadecane from a mixture also containing one or more other macrocyclic polyethers.
- 18-Crown-6 can be prepared by heating tetraethylene glycol and bis(2-chloroethyl) ether in the presence of tetrahydrofuran as a solvent and potassium hydroxide, see "Synthesis" 1976, 515-516.
- the reaction mixture thus formed contains 18-crown-6, potassium chloride, water and by-products, i.a. macrocyclic polyethers having a ring of larger size than 18-crown-6.
- the solvent was evaporated from the reaction mixture to give a brown slurry to which dichloromethane was added.
- the invention provides a process for the isolation of 1,4,7,10,13,16-hexaoxacyclooctadecane from a mixture also containing one or more other macrocyclic polyethers containing rings of more than 7 carbon atoms, characterized by reacting the 1,4,7,10,13,16-hexaoxacyctooctadecane with nitromethane in the presence of a solvent for the said macrocyclic polyethers, to precipitate a complex of 1,4,7,10,13,16-hexaoxacyclooctadecane and nitromethane, separating precipitated complex from the mixture containing the complex, dissociating separated complex and separating the components from each other.
- nitromethane is selective in that, when contacted with a mixture containing 18- crown-6 and one or more other macrocyclic polyethers, it only forms a complex with 18-crown-6.
- the 18-crown-6-nitromethane complex obtained according to the invention does not, or hardly contains any macrocyclic polyethers other than 18-crown-6.
- the complex can simply be dissociated into 18-crown-6 and nitromethane by allowing it to stand in the open air.
- the complex is rapidly dissociated by heating it at sub-atmospheric pressure and removing the nitromethane vapour formed, leaving pure or almost pure 18-crown-6. Heating may take place at a temperature of, for example, 35°C to 125°C at a pressure of, for example, 5 to 1500 Pa.
- the process according to the invention must be carried out in a solvent for macrocyclic polyethers in which the 18-crown-6-nitromethane complex can be precipitated.
- a solvent may substantially consist of nitromethane.
- a solvent is taken to consist substantially of a specified compound when the content of this specified compound in the solvent is higher than 50%w.
- the solvent substantially consists of an ether (other than a macrocyclic polyester having more than 7 carbon atoms in the ring).
- Preferred ethers are dialkyl ethers and cyclic ethers.
- dialkyl ethers are diethyl ether, di-n-butyl ether and di-n-hexylether.
- the 18-crown-6-nitromethane complex is considerably less soluble in diethyl ether than in nitromethane at the same temperature, so that a considerably larger part of the 18-crown-6 present in the starting mixture can be isolated.
- Attractive examples of the cyclic ethers are 1,4-dioxane and tetrahydrofuran.
- the solvent substantially consists of an alkanol, a hydrocarbon (or a mixture of hydrocarbons) or water.
- suitable alkanols are those having in the range of from one to five carbon atoms, for example methanol, ethanol, 2-propanol and tert- butanol.
- suitable hydrocarbons are benzene, toluene, the three xylenes and heptane.
- Particularly attractive solvents are methanol and benzene.
- 18-Crown-6 dissolved in water may be removed therefrom by reaction with nitromethane to form a precipitate of the 18-crown-6-nitromethane complex in nitromethane-containing water. Mixtures of solvents may be used, for example of diethyl ether and ethanol.
- the 18-crown-6-acetonitrile complex is very difficult to precipitate from the solvents mentioned in the last three paragraphs, if at all, as this complex is too highly soluble in these solvents.
- the reaction between 18-crown-6 and nitromethane is preferably carried out at a temperature in the range of from -25°C to +35°C, and, when the solvent substantially consists of nitromethane, of from 0°C to -25°C, so as to enable a very large part of the 18-crown-6 to be isolated.
- the solvent substantially consists of an ether, an alkanol, a hydrocarbon (or a mixture of hydrocarbons) or water
- the reaction between 18-crown-6 and nitromethane is very suitably carried out at a temperature in the range of from 0°C to +35°C.
- Ambient Temperature for example, a temperature between 15°C and 25°, is very suitable.
- the 18-crown-6-nitromethane complex can easily be separated from the mixture containing the complex, for example by filtration, centrifugation or decantation.
- the 18-crown-6-nitromethane complex contains two molecules of nitromethane per molecule of 18-crown-6. Accordingly, the 18-crown-6 is reacted with nitromethane using a molar ratio of nitromethane to 18-crown-6 of at least 2:1. Preferably, this molar ratio is not higher than 20:1. This range is not critical, molar ratios of nitromethane to 18-crown-6 outside this range may be used, if desired.
- the 18-crown-6-nitromethane complex may be precipitated in any suitable manner, for example by adding nitromethane to the starting mixture and, if desired, cooling the mixture thus obtained to a suitable temperature, or by dissolving the starting mixture in diethyl ether and adding nitromethane at ambient temperature to the solution obtained, or by dissolving the starting mixture in any other of the above-mentioned solvents, for example methanol, adding nitromethane and, if desired, cooling the mixture obtained to a suitable temperature.
- the starting mixture may be solid or liquid at the temperature at which the 18-crown-6 is reacted with nitromethane.
- the 18-crown-6 in the starting mixture may have been formed by any process. Very good results have been obtained by reacting tetraethylene glycol with a bis(2-haloethyl)ether, halo representing chloro, bromo or iodo, in the presence of an alkali metal hydroxide. If desired, the alkali metal halide formed and solvent, if present, may be removed from the reaction mixture obtained, leaving the 18-crown-6-containing starting mixture.
- Other examples of processes for the preparation of 18-crown-6 are:
- Acetonitrile (1.48 mmol) was added to a solution of 18-crown-6 (0.19 mmol) and macrocyclic polyether No. 3 of the formula page (0.19 mmol) in diethyl ether (1 ml) at 25°C.
- the 18-crown-6-acetonitrile complex crystallized out immediately and was filtered off. It contained 40% of the starting amount of 18-crown-6.
- Comparison with Example VI shows that nitromethane had complexed a much larger part of the 18-crown-6 than acetonitrile. The purity of the 18-crown-6 was more than 99%.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
- The invention relates to a process for the isolation of 1,4,7,10,13,16-hexaoxacydooctadecane from a mixture also containing one or more other macrocyclic polyethers.
- Hereinafter 1,4,7,10,13,16-hexaoxacyclooctadecane will also be referred to by its trivial name "18-crown-6". Its structural formula is shown on the Formula page (compound 9).
- 18-Crown-6 can be prepared by heating tetraethylene glycol and bis(2-chloroethyl) ether in the presence of tetrahydrofuran as a solvent and potassium hydroxide, see "Synthesis" 1976, 515-516. The reaction mixture thus formed contains 18-crown-6, potassium chloride, water and by-products, i.a. macrocyclic polyethers having a ring of larger size than 18-crown-6. The solvent was evaporated from the reaction mixture to give a brown slurry to which dichloromethane was added. The potassium chloride was filtered off from the solution thus obtained, the filtrate was dried (MgS04), the solvent was evaporated from the dried filtrate to yield a residue of crude 18-crown-6. This residue was distilled to give a discoloured distillate containing 18-crown-6. This distillate was dissolved in acetonitrile and the solution was cooled to -45°C. The resultant precipitate of 18-crown-6-acetonitrile complex was collected by filtration. Distillation of this complex gave a distillate of pure 18-crown-6.
- A disadvantage of this procedure is that the 18-crown-6 is distilled twice and that expensive measures must be taken to prevent the occurrence of powerful and destructive explosions during these distillations, see "Chemical & Engineering News", September 6, 1976,
page 5 and December 13, 1976,page 5. Moreover the 18-crown-6 is obtained in a fairly low yield. It is also known, e.g. from Z. Naturforsch 31b 1192-1200 (1976) that 18-crown-6 forms a crystalline adduct with nitromethane. - The Applicants have found a process for the isolation, of 18-crown-6- in which the 18-crown-6 is obtained in high yield and need not be distilled, thus avoiding the explosions mentioned hereinbefore.
- Accordingly the invention provides a process for the isolation of 1,4,7,10,13,16-hexaoxacyclooctadecane from a mixture also containing one or more other macrocyclic polyethers containing rings of more than 7 carbon atoms, characterized by reacting the 1,4,7,10,13,16-hexaoxacyctooctadecane with nitromethane in the presence of a solvent for the said macrocyclic polyethers, to precipitate a complex of 1,4,7,10,13,16-hexaoxacyclooctadecane and nitromethane, separating precipitated complex from the mixture containing the complex, dissociating separated complex and separating the components from each other.
- Surprisingly, nitromethane is selective in that, when contacted with a mixture containing 18- crown-6 and one or more other macrocyclic polyethers, it only forms a complex with 18-crown-6. Hence, the 18-crown-6-nitromethane complex obtained according to the invention does not, or hardly contains any macrocyclic polyethers other than 18-crown-6.
- As the 18-crown-6-nitromethane complex gives off nitromethane vapour the complex can simply be dissociated into 18-crown-6 and nitromethane by allowing it to stand in the open air. The complex is rapidly dissociated by heating it at sub-atmospheric pressure and removing the nitromethane vapour formed, leaving pure or almost pure 18-crown-6. Heating may take place at a temperature of, for example, 35°C to 125°C at a pressure of, for example, 5 to 1500 Pa.
- The process according to the invention must be carried out in a solvent for macrocyclic polyethers in which the 18-crown-6-nitromethane complex can be precipitated. Such a solvent may substantially consist of nitromethane. A solvent is taken to consist substantially of a specified compound when the content of this specified compound in the solvent is higher than 50%w.
- According to a feature of the invention the solvent substantially consists of an ether (other than a macrocyclic polyester having more than 7 carbon atoms in the ring). Preferred ethers are dialkyl ethers and cyclic ethers. Examples of dialkyl ethers are diethyl ether, di-n-butyl ether and di-n-hexylether. The 18-crown-6-nitromethane complex is considerably less soluble in diethyl ether than in nitromethane at the same temperature, so that a considerably larger part of the 18-crown-6 present in the starting mixture can be isolated. Attractive examples of the cyclic ethers are 1,4-dioxane and tetrahydrofuran.
- According to another feature of the invention the solvent substantially consists of an alkanol, a hydrocarbon (or a mixture of hydrocarbons) or water. Examples of suitable alkanols are those having in the range of from one to five carbon atoms, for example methanol, ethanol, 2-propanol and tert- butanol. Examples of suitable hydrocarbons are benzene, toluene, the three xylenes and heptane. Particularly attractive solvents are methanol and benzene. 18-Crown-6, dissolved in water may be removed therefrom by reaction with nitromethane to form a precipitate of the 18-crown-6-nitromethane complex in nitromethane-containing water. Mixtures of solvents may be used, for example of diethyl ether and ethanol.
- The 18-crown-6-acetonitrile complex is very difficult to precipitate from the solvents mentioned in the last three paragraphs, if at all, as this complex is too highly soluble in these solvents.
- The reaction between 18-crown-6 and nitromethane is preferably carried out at a temperature in the range of from -25°C to +35°C, and, when the solvent substantially consists of nitromethane, of from 0°C to -25°C, so as to enable a very large part of the 18-crown-6 to be isolated. Where the solvent substantially consists of an ether, an alkanol, a hydrocarbon (or a mixture of hydrocarbons) or water, the reaction between 18-crown-6 and nitromethane is very suitably carried out at a temperature in the range of from 0°C to +35°C. Ambient Temperature, for example, a temperature between 15°C and 25°, is very suitable.
- The 18-crown-6-nitromethane complex can easily be separated from the mixture containing the complex, for example by filtration, centrifugation or decantation.
- The 18-crown-6-nitromethane complex contains two molecules of nitromethane per molecule of 18-crown-6. Accordingly, the 18-crown-6 is reacted with nitromethane using a molar ratio of nitromethane to 18-crown-6 of at least 2:1. Preferably, this molar ratio is not higher than 20:1. This range is not critical, molar ratios of nitromethane to 18-crown-6 outside this range may be used, if desired.
- The 18-crown-6-nitromethane complex may be precipitated in any suitable manner, for example by adding nitromethane to the starting mixture and, if desired, cooling the mixture thus obtained to a suitable temperature, or by dissolving the starting mixture in diethyl ether and adding nitromethane at ambient temperature to the solution obtained, or by dissolving the starting mixture in any other of the above-mentioned solvents, for example methanol, adding nitromethane and, if desired, cooling the mixture obtained to a suitable temperature. The starting mixture may be solid or liquid at the temperature at which the 18-crown-6 is reacted with nitromethane.
- The 18-crown-6 in the starting mixture may have been formed by any process. Very good results have been obtained by reacting tetraethylene glycol with a bis(2-haloethyl)ether, halo representing chloro, bromo or iodo, in the presence of an alkali metal hydroxide. If desired, the alkali metal halide formed and solvent, if present, may be removed from the reaction mixture obtained, leaving the 18-crown-6-containing starting mixture. Other examples of processes for the preparation of 18-crown-6 are:
- (1) Elimination of hydrogen chloride from 17-chloro-3,6,9,12,15-pentaoxaheptadecanol, followed by ring closure, in the presence of potassium tert-butoxide, see British patent specification 1,285,367.
- (2) Catalytic oligomerization of ethylene oxide, see German Offenlegungsschrift2,401,126.
- (3) Reaction of triethylene glycol with 3,6-dioxa-1,8-dichlorooctane in the presence of potassium hydroxide and 10% aqueous tetrahydrofuran, as described in J.Org.Chem. 39 (1974) 2445-2446.
- The invention will now be illustrated by reference to the following Examples.
- A 3-litre three-necked round-bottomed flask, fitted with a mechanical stirrer, a reflux condenser and a 250 ml dropping funnel was charged with potassium hydroxide pellets (416 g. containing 6.3 mol KOH), tetraethylene glycol (1.25 mol) and tetrahdyrofuran (1000 ml). The reaction vessel was placed in a heating mantle and gently heated. After 15 minutes a solution of bis(2-chloroethyl)ether (3.125 mol) in tetrahydrofuran (150 ml) was added in one stream from the dropping funnel to the vigorously stirred reactants. The reaction mixture was then heated under reflux, with stirring for 18 hours. Subsequently, the reaction mixture was cooled and the solvent was removed under a pressure of 1.9 kPa to give a brown slurry to which dichloromethane (750 ml) was added. The resulting suspension of potassium chloride was filtered and the potassium chloride filtered off was washed with dichloromethane (100 ml). The combined filtrate and washings were dried over anhydrous magnesium sulphate and the solvent was evaporated at a pressure of 1.9 kPa to give a residue of crude 18-crown-6 (396 g) containing 0.531 mol of 18-crown-6 (yield 42.5%, calculated on starting tetraethylene glycol), potassium chloride and at least eight other compounds among which 1,4,7,10,13,16,19,22,25,28,31,34-dodecaoxacyclohexatriacontane, hexaethyleneglycol and unreacted tetraethylene glycol. This crude 18-crown-6 was used as described hereinafter.
- Crude 18-crown-6 (3.021 g), prepared as described above, was dissolved in nitromethane (4 ml). The solution formed was cooled to -20°C and the 18-crown-6-nitromethane complex precipitated was filtered off (1.248 g). The complex was kept for 30 minutes at 70°C and a pressure of 13 Pa, leaving 18-crown-6 in a yield of 37% calculated on starting tetraethylene glycol, or 87% calculated on 18-crown-6 in the crude 18-crown-6. The purity of the 18-crown-6 was higher than 99.5%.
- Crude 18-crown-6 (3.021 g), prepared as described above, was dissolved in acetonitrile (4 ml). The solution formed was cooled to -20°C and the 18-crown-6-acetonitrile complex was filtered off. The complex was kept for 30 minutes at 70°C and a pressure of 13 Pa, leaving 18-crown-6 in a yield of 27% calculated on starting tetraethylene glycol, or 63% calculated on 18-crown-6 in the crude 18-crown-6. Comparison with Example I shows that complexation with nitromethane allows the 18-crown-6 in a much higher yield.
- This experiment is according to the process described in "Synthesis" 1976, 515-516.
- Crude 18-crown-6 (39.6 g), prepared as described above, was distilled at a pressure of 20 Pa to give a distillate (21.3 g) boiling at 140-210°C. This distillate was mixed with acetonitrile (53 ml) at 20°C and the mixture formed was cooled to -45°C. The resultant 18-crown-6-acetonitrile complex was filtered off and subjected to distillation at a pressure of 2 Pa to give a distillate of 18-crown-6 in a yield of 25% calculated on starting tetraethylene glycol, or 59% calculated on 18-crown-6 in the crude 18-crown-6. Comparison with Example I shows that complexation with nitromethane at -20°C allows the 18-crown-6 in a much higher yield than complexation with acetonitrile at -45°C followed by distillation of 18-crown-6.
- Crude 18-crown-6 (3.04 g), prepared as described above, was mixed with nitromethane (5 ml) at 20°C. After 16 hours the precipitate formed was filtered off and kept for 30 minutes at 70°C and a pressure of 13 Pa, leaving 18-crown-6 in a yield of 28% calculated on starting tetraethylene glycol, or 66% calculated on 18-crown-6 in the crude 18-crown-6. Comparison of this yield with the higher yield obtained in Example I shows the favourable influence of the temperature of -20°C when nitromethane is used as the solvent.
- Crude 18-crown-6 (3.5 g), prepared as described above, was extracted with four 20-ml portions of diethyl ether. The residue of potassium chloride thus obtained was filtered off, the four filtrates were combined, and the solvent was evaporated. Then, a mixture of nitromethane (0.7 ml) and 5.1 ml of diethyl ether was added at 20°C, which caused an immediate precipitation of the 18-crown-6-nitromethane complex. The complex precipitated was filtered off and kept for 30 minutes at 70°C and a pressure of 13 Pa, leaving 18-crown-6 in a yield of 37% calculated on starting tetraethylene glycol, or 87% calculated on 18-crown-6 in the crude 18-crown-6. Comparison of this yield with the lower yield of Example II shows the favourable influence of the diethyl ether.
- Crude 18-crown-6 (3.16 g), prepared as described above, was mixed with nitromethane (0.6 ml) and methanol (4.4 ml) at 20°C. After 16 hours the precipitate formed was filtered off and kept for 30 minutes at 70°C and a pressure of 13 Pa, leaving 18-crown-6 in a yield of 13%, calculated on starting tetraethylene glycol, or 31 %, calculated on 18-crown-6 in the crude 18-crown-6. Comparison of this yield with the higher yields obtained in the Examples II and III shows that in this case diethyl ether and nitromethane are more attractive solvents than methanol.
- Nitromethane (0.6 ml) was added at 20°C to a solution of 18-crown-6 (1.13 mmol) and macrocyclic polyether No. 3 of the formula page (1.15 mmol) in diethyl ether (6 ml). The precipitate formed was filtered off, washed at 20°C with 1 ml of a diethyl ether/nitromethane (10/1 v/v) mixture and dried with dry air at 20°C. The dried precipitate was the 18-crown-6-nitromethane complex. The complex contained 92% of the starting amount of 18-crown-6 and the molar ratio of 18-crown-6 to macrocyclic polyether No. 3 in the dried precipitate was 97:3. The complex was kept for 30 minutes at 70°C and a pressure of 13 Pa leaving 18-crown-6 containing 3% macrocyclic polyether No. 3.
- Nitromethane (1.48 mmol) was added to a solution of 18-crown-6 (0.19 mmol) and macrocyclic polyether No. 3 of the formula page (0.19 mmol) in a solvent (1 ml) at 25°C. The 18-crown-6-nitromethane complex precipitated was filtered off. The filtered material was kept for 30 minutes at 70°C and a pressure of 13 Pa, which caused dissociation into nitromethane, which was sucked off, and 18- crown-6. Then, the 18-crown-6 was weighed and the yield of it on the starting amount of 18-crown-6 was calculated. Six solvents were tested in this manner. Table I presents the results. The purity of the 18-crown-6 was 99% in each of the Examples.
- Acetonitrile (1.48 mmol) was added to a solution of 18-crown-6 (0.19 mmol) and macrocyclic polyether No. 3 of the formula page (0.19 mmol) in diethyl ether (1 ml) at 25°C. The 18-crown-6-acetonitrile complex crystallized out immediately and was filtered off. It contained 40% of the starting amount of 18-crown-6. Comparison with Example VI shows that nitromethane had complexed a much larger part of the 18-crown-6 than acetonitrile. The purity of the 18-crown-6 was more than 99%.
- The experiments of Examples VII to XI were carried out with acetonitrile (1.71 mmol) instead of nitromethane (1.15 mmol): In none of the five experiments was a precipitate formed.
-
- In Comparative Experiment No. I nitromethane (1.15 mmol) was added to a saturated solution of macrocyclic polyether No. 1 in diethyl ether (1 ml) at 25°C. In Comparative Experiments J to P nitromethane was added to a solution of 100 mg of the macrocyclic polyether in diethyl ether at 25°C. In none of the eight experiments was a precipitate formed.
- Nitromethane (1.15 mmol) was added at 25°C to a saturated solution of macrocyclic polyether 1 (Table II and formula page) in methanol (1 ml). No precipitate was formed.
Claims (17)
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EP78200037A Expired EP0000218B1 (en) | 1977-06-23 | 1978-06-12 | Process for the isolation of 1,4,7,10,13,16-hexaoxacyclooctadecane |
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EP (1) | EP0000218B1 (en) |
JP (1) | JPS6034955B2 (en) |
CA (1) | CA1095922A (en) |
DE (1) | DE2861306D1 (en) |
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WO2017062398A1 (en) * | 2015-10-08 | 2017-04-13 | Novelis Inc. | A process for warm forming an age hardenable aluminum alloy in t4 temper |
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1978
- 1978-06-05 CA CA304,729A patent/CA1095922A/en not_active Expired
- 1978-06-12 EP EP78200037A patent/EP0000218B1/en not_active Expired
- 1978-06-12 DE DE7878200037T patent/DE2861306D1/en not_active Expired
- 1978-06-21 IT IT24811/78A patent/IT1096598B/en active
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IT1096598B (en) | 1985-08-26 |
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CA1095922A (en) | 1981-02-17 |
JPS6034955B2 (en) | 1985-08-12 |
DE2861306D1 (en) | 1982-01-14 |
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