WO2024185877A1 - トリフルオロ酢酸エステルの製造方法 - Google Patents
トリフルオロ酢酸エステルの製造方法 Download PDFInfo
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- WO2024185877A1 WO2024185877A1 PCT/JP2024/008974 JP2024008974W WO2024185877A1 WO 2024185877 A1 WO2024185877 A1 WO 2024185877A1 JP 2024008974 W JP2024008974 W JP 2024008974W WO 2024185877 A1 WO2024185877 A1 WO 2024185877A1
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- Prior art keywords
- trifluoroacetic acid
- cof
- carbon atoms
- acid ester
- lower alcohol
- 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.)
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/14—Preparation of carboxylic acid esters from carboxylic acid halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/62—Halogen-containing esters
- C07C69/63—Halogen-containing esters of saturated acids
Definitions
- This disclosure relates to a method for producing trifluoroacetic esters.
- Trifluoroacetic acid esters have traditionally been used as raw materials for pharmaceuticals and agrochemicals, and their importance is expected to continue to grow in the future.
- Known methods for producing trifluoroacetic acid esters include reacting CF 3 COF with ethanol in the presence of potassium fluoride, as disclosed in Patent Documents 1 and 2.
- a method using an amine instead of potassium fluoride, as disclosed in Patent Document 3 is also known.
- the objective of this disclosure is to find a method for producing trifluoroacetic acid that does not use amines or potassium fluoride and that can purify trifluoroacetic acid using a simple method such as distillation.
- the present inventors have found that by adding an excess amount of CF 3 COF to a lower alcohol having 1 to 4 carbon atoms, it is possible to obtain a trifluoroacetic acid ester by simply distilling the reaction product without using additives such as amines or potassium fluoride. Based on this finding, the present inventors have conducted further research and have completed the present disclosure.
- Item 1 A method for producing a trifluoroacetic ester, comprising the steps of: A method for producing a trifluoroacetic acid ester, comprising a reaction step of adding equimolar or more of CF 3 COF to a lower alcohol having 1 to 4 carbon atoms to obtain a trifluoroacetic acid ester and HF.
- Item 2. Item 2. The method according to item 1, wherein in the reaction step, CF 3 COF is added in a molar ratio of 1 to 3 moles per mole of the lower alcohol having 1 to 4 carbon atoms.
- Item 3. Item 3.
- the method for producing trifluoroacetic esters according to the present disclosure described above makes it possible to purify trifluoroacetic acid without using amines or potassium fluoride, and by simply carrying out a simple operation such as distillation on the reaction product.
- the method for producing a trifluoroacetic ester according to the present disclosure includes a reaction step of adding equimolar or more of CF 3 COF to a lower alcohol having 1 to 4 carbon atoms to obtain a trifluoroacetic ester and HF.
- lower alcohols having 1 to 4 carbon atoms can be used as the lower alcohol, with no particular limitations. However, since ethyl trifluoroacetate is particularly useful as the target compound, it is preferable to use ethanol.
- CF 3 COF is added to the lower alcohol having 1 to 4 carbon atoms in an amount equal to or greater than the lower alcohol having 1 to 4 carbon atoms, that is, CF 3 COF is added at a ratio of 1 mole or more per mole of the lower alcohol having 1 to 4 carbon atoms. If CF 3 COF is not added in an amount equal to or greater than the lower alcohol having 1 to 4 carbon atoms, the lower alcohol having 1 to 4 carbon atoms will be mixed in the obtained reaction product, and the process of purifying the final target trifluoroacetic acid ester cannot be simplified.
- an azeotropic composition such as a lower alcohol having 1 to 4 carbon atoms/trifluoroacetic acid ester, water/trifluoroacetic acid ester/lower alcohol having 1 to 4 carbon atoms, or lower alcohol having 1 to 4 carbon atoms/HF is produced as a product, it becomes difficult to separate the trifluoroacetic acid ester.
- CF 3 COF is added at a ratio of 1 mole or more per mole of the lower alcohol having 1 to 4 carbon atoms, preferably at a ratio exceeding 1 mole, more preferably at a ratio of 1.02 moles or more, and even more preferably at a ratio of 1.05 moles or more.
- the upper limit for the amount of CF 3 COF added is preferably a ratio of 3 moles per mole of the lower alcohol having 1 to 4 carbon atoms, more preferably a ratio of 1.5 moles, and even more preferably a ratio of 1.2 moles.
- the temperature conditions in the reaction process in which CF 3 COF is added to a lower alcohol having 1 to 4 carbon atoms to obtain a trifluoroacetic acid ester and HF are preferably -20°C or higher, more preferably 0°C or higher, and even more preferably 10°C or higher, in order to suppress dissolution of CF 3 COF in the reaction crude and to prevent an excessive amount of recycling during distillation.
- the temperature conditions in the reaction process in which CF 3 COF is added to a lower alcohol having 1 to 4 carbon atoms to obtain a trifluoroacetic acid ester and HF are preferably 100° C. or lower, more preferably 95° C. or lower, and even more preferably 90° C. or lower, in order to suppress corrosion of the reaction equipment and to avoid increasing the reaction pressure.
- the reaction in the reaction step of adding CF 3 COF to a lower alcohol having 1 to 4 carbon atoms to obtain trifluoroacetic acid ester and HF is preferably carried out under a sealed condition in order to reduce the loss of reaction products and raw materials. In this case, it is preferable not to add nitrogen or argon, etc., since this causes a decrease in the recovery rate of CF 3 COF.
- the reaction pressure can be reduced or increased depending on the reaction temperature, but is preferably set to minus 0.05 MPaG or more, more preferably 0.0 MPaG or more, and even more preferably 0.1 MPaG or more, in order to increase the reaction rate.
- the reaction pressure in the reaction process in which CF 3 COF is added to a lower alcohol having 1 to 4 carbon atoms to obtain a trifluoroacetic acid ester and HF is preferably 1.5 MPaG or less, more preferably 1.0 MPaG or less, and even more preferably 0.8 MPaG or less, for reasons of preventing leakage (safety).
- the reaction time in the reaction step in which CF 3 COF is added to a lower alcohol having 1 to 4 carbon atoms to obtain a trifluoroacetic acid ester and HF is preferably 1 hour or more, more preferably 2 hours or more, and even more preferably 3 hours or more, in order to keep the temperature stable (by gradual heating).
- the reaction time is preferably 24 hours or less, more preferably 20 hours or less, and even more preferably 16 hours or less, in consideration of improving productivity.
- a reaction product obtained by adding equimolar or more of CF 3 COF to a lower alcohol having 1 to 4 carbon atoms can be purified to give a highly pure trifluoroacetic acid ester.
- the purification method in the purification step can be any known purification method and is not particularly limited. However, it is preferable to carry out purification by distillation because it is a simple method.
- the present disclosure discloses a composition
- a composition comprising a trifluoroacetic acid ester, HF, and CF 3 COF, the CF 3 COF content being 0.1 to 30 wt %.
- the content of CF 3 COF contained in the composition of the present disclosure is 0.1 mass % or more, preferably 0.2 mass % or more, and more preferably 0.5 mass % or more, based on 100 mass % of the composition of the present disclosure.
- the content of CF 3 COF contained in the composition of the present disclosure is 30 mass % or less, preferably 10 mass % or less, and more preferably 5 mass % or less, based on 100 mass % of the composition of the present disclosure.
- the content of trifluoroacetic acid ester is preferably 70% by mass or more, more preferably 75% by mass or more, and even more preferably 80% by mass or more, based on 100% by mass of the composition of the present disclosure.
- the content of trifluoroacetic acid ester is preferably 90% by mass or less, more preferably 89% by mass or less, and even more preferably 88% by mass or less, based on 100% by mass of the composition of the present disclosure.
- the HF content is preferably 10% by mass or more, more preferably 11% by mass or more, and even more preferably 12% by mass or more, based on 100% by mass of the composition of the present disclosure.
- the HF content is preferably 15% by mass or less, more preferably 14% by mass or less, and even more preferably 13% by mass or less, based on 100% by mass of the composition of the present disclosure.
- composition of the present disclosure can be obtained by adding CF 3 COF in an equimolar amount or more to a lower alcohol having 1 to 4 carbon atoms.
- composition of the present disclosure may contain at least one selected from the group consisting of trifluoroacetic acid, toluene, and water, within a range that does not impair the effects and purpose of the composition.
- Example 1 204g (4.43mol) of ethanol (containing 0.2% water) was charged into a 1L stainless steel autoclave, and while heating and stirring at 60°C, 585g (5.04mol) of CF3COF was charged at a constant flow rate to react. The reaction pressure finally reached 0.6MPaG. After the reaction, the reaction mixture was charged into a rectification column and rectified under normal pressure. After recovering CF3COF with a low boiling point and extracting the HF fraction with a boiling point of 20°C, 580g of high-purity ethyl trifluoroacetate was recovered (yield 92%).
- Example 2 As shown in Table 1 below, Examples 2 to 6 were carried out in a manner similar to Example 1.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
項1.
トリフルオロ酢酸エステルの製造方法であって、
炭素数1~4の低級アルコールに対し、CF3COFを等モル以上添加することにより、トリフルオロ酢酸エステル及びHFを得る反応工程を有する、トリフルオロ酢酸エステルの製造方法。
項2.
前記反応工程において、炭素数1~4の低級アルコール1モルに対し、CF3COFを1~3モルのモル比で添加する、項1に記載の製造方法。
項3.
前記炭素数1~4の低級アルコールはエタノールである、項1又は2の製造方法。
項4.
トリフルオロ酢酸エステルと、HFと、CF3COFとを含み、CF3COFの含有量は0.1~30質量%である、組成物。
1Lのステンレスオートクレーブにエタノール204g 4.43mol (水分:0.2%含む)を仕込み、60℃に加熱攪拌しながら、CF3COF 585g 5.04molを一定流量で仕込みながら反応させた。反応圧力は最終的に0.6MPaGになった。反応後、反応混合物を精留塔に仕込み常圧下に精留を行った。低沸点のCF3COFを回収、沸点20℃のHF留分を抜き出したのち、高純度のトリフルオロ酢酸エチル 580gを回収した(収率92%)。
下記表1の通り、実施例1に準じた方法で実施例2~6を行った。
1Lのステンレスオートクレーブにエタノール204g 4.435mol (水分:0.2%含む)を仕込み、60℃に加熱攪拌しながら、CF3COF 250g 2.16molを一定流量で仕込みながら反応させた。反応圧力は最終的に大気圧になった。反応後、反応混合物を精留塔に仕込み常圧下に精留を行った。エタノールとトリフルオロ酢酸エチルとの共沸組成物が形成され、精留にて分離できず、トリフルオロ酢酸エチルを得ることは出来なかった。
Claims (4)
- トリフルオロ酢酸エステルの製造方法であって、
炭素数1~4の低級アルコールに対し、CF3COFを等モル以上添加することにより、トリフルオロ酢酸エステル及びHFを得る反応工程を有する、トリフルオロ酢酸エステルの製造方法。 - 前記反応工程において、炭素数1~4の低級アルコール1モルに対し、CF3COFを1~3モルのモル比で添加する、請求項1に記載の製造方法。
- 前記炭素数1~4の低級アルコールはエタノールである、請求項1又は2の製造方法。
- トリフルオロ酢酸エステルと、HFと、CF3COFとを含み、CF3COFの含有量は0.1~30質量%である、組成物。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480016329.9A CN120712249A (zh) | 2023-03-09 | 2024-03-08 | 三氟乙酸酯的制造方法 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023036242 | 2023-03-09 | ||
| JP2023-036242 | 2023-03-09 |
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| Publication Number | Publication Date |
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| WO2024185877A1 true WO2024185877A1 (ja) | 2024-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2024/008974 Ceased WO2024185877A1 (ja) | 2023-03-09 | 2024-03-08 | トリフルオロ酢酸エステルの製造方法 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2024127873A (ja) |
| CN (1) | CN120712249A (ja) |
| WO (1) | WO2024185877A1 (ja) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6236344A (ja) * | 1985-07-19 | 1987-02-17 | アウシモント、ソチエタ、ペル、アツイオ−ニ | トリフルオロ酢酸アルキルの製法 |
-
2024
- 2024-03-08 WO PCT/JP2024/008974 patent/WO2024185877A1/ja not_active Ceased
- 2024-03-08 JP JP2024035432A patent/JP2024127873A/ja active Pending
- 2024-03-08 CN CN202480016329.9A patent/CN120712249A/zh active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6236344A (ja) * | 1985-07-19 | 1987-02-17 | アウシモント、ソチエタ、ペル、アツイオ−ニ | トリフルオロ酢酸アルキルの製法 |
Non-Patent Citations (1)
| Title |
|---|
| MAJID A. J, SHREEVE M: "Fluorinated Esters Stable to Fluoride Ion", THE JOURNAL OF ORGANIC CHEMISTRY., vol. 38, no. 23, 1 November 1973 (1973-11-01), pages 4028 - 4031, XP093207630, DOI: 10.1021/jo00987a016 * |
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| JP2024127873A (ja) | 2024-09-20 |
| CN120712249A (zh) | 2025-09-26 |
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