CA3133765C - Method for preparing a partially fluorinated alcohol - Google Patents

Method for preparing a partially fluorinated alcohol

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CA3133765C
CA3133765C CA3133765A CA3133765A CA3133765C CA 3133765 C CA3133765 C CA 3133765C CA 3133765 A CA3133765 A CA 3133765A CA 3133765 A CA3133765 A CA 3133765A CA 3133765 C CA3133765 C CA 3133765C
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olah
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Andrew SHARRATT
David Grundy
Ira Saxena
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Mexichem Fluor SA de CV
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B39/00—Halogenation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/62—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by introduction of halogen; by substitution of halogen atoms by other halogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/64—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by simultaneous introduction of -OH groups and halogens
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
    • C07C31/34—Halogenated alcohols
    • C07C31/38—Halogenated alcohols containing only fluorine as halogen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
    • C07C41/01—Preparation of ethers
    • C07C41/09—Preparation of ethers by dehydration of compounds containing hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C43/00—Ethers; Compounds having groups, groups or groups
    • C07C43/02—Ethers
    • C07C43/03—Ethers having all ether-oxygen atoms bound to acyclic carbon atoms
    • C07C43/04—Saturated ethers
    • C07C43/12—Saturated ethers containing halogen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C68/00—Preparation of esters of carbonic or haloformic acids
    • C07C68/02—Preparation of esters of carbonic or haloformic acids from phosgene or haloformates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/96—Esters of carbonic or haloformic acids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D301/00—Preparation of oxiranes
    • C07D301/02—Synthesis of the oxirane ring
    • C07D301/03—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D301/00—Preparation of oxiranes
    • C07D301/02—Synthesis of the oxirane ring
    • C07D301/24—Synthesis of the oxirane ring by splitting off HAL—Y from compounds containing the radical HAL—C—C—OY
    • C07D301/26—Y being hydrogen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
    • C07D303/02—Compounds containing oxirane rings
    • C07D303/08—Compounds containing oxirane rings with hydrocarbon radicals, substituted by halogen atoms, nitro radicals or nitroso radicals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
    • C07D303/02—Compounds containing oxirane rings
    • C07D303/48—Compounds containing oxirane rings with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms, e.g. ester or nitrile radicals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Epoxy Compounds (AREA)
  • Secondary Cells (AREA)

Abstract

Un procédé de préparation d'un alcool partiellement fluoré consiste à faire réagir un époxyde : R1, R2, R3 et R4 sont indépendamment choisis dans le groupe comprenant H, F, Cl, Br, I, CF3, alkyle, fluoroalkyle, haloalkyle avec un agent de fluoration.A process for preparing a partially fluorinated alcohol consists of reacting an epoxide: R1, R2, R3 and R4 are independently chosen from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl with a fluorinating agent.

Description

1 METHOD FOR PREPARING A PARTIALLY FLUORINATED ALCOHOL The present invention relates to methods of preparing partially fluorinated alcohols (fluorohydrins) from fluorinated epoxides and preparing fluorinated carbonate esters from fluorohydrins. Fluorohydrins are useful as solvents and as synthetic building blocks from which various species such as esters, ethers, ketones, aldehydes and acids can be prepared. Of particular interest is their utility in the preparation of fluorinated carbonate esters, which are an important class of materials with significant commercial value. Fluorinated carbonate esters are commonly used without modification as synthetic intermediates and as solvents in electronic devices such as batteries (e.g. lithium ion batteries) and to manufacture products such as lubricants, sealants, and coatings. The production of fluorohydrins from epoxides is known in the art. For example, Olah described a general method for preparing fluorohydrins by ring opening epoxides with a nucleophilic source of fluoride (G. A. Olah etal, Israel Jr. Chern., 17(1978),148-149). However, Olah did not extend this work to the preparation of fluorohydrins from fluorinated epoxides. The ring opening of the fluorinated epoxide, 2,3-epoxy1,1,1-trifluoropropane (TFPO), with various nucleophiles to form fluorohydrins was generally described in a review ofthe chemistry of TFPO by Uneyama in Jr. Fluorine Chern., 105(2000) 285-293. However, this review was silent on the possibility or likely outcome of attempting to ring open TFPO or indeed any other fluorinated epoxide with nucleophilic fluorinating agents as taught by Olah. General methods for the production of carbonate esters from alcohols and a carboxylating agent are known in the art, see for example “March’s Advanced Organic Chemistry”, M. B. Smith and J. March, 6th edition, page 1276. However, the production of fluorinated carbonate esters from fluorohydrins and carboxylating agents is unknown as are the products of such reactions. METHODS OF THE INVENTION According to a first aspect of the invention there is provided a method for preparing a partially fluorinated alcohol, comprising reacting a fluorinated epoxide: Date Refue/Date Received 2024-04-05WO 2020/188274 CA 03133765 2021-09-15 2 PCT/GB2020/050701 wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl with a fluorinating agent. Preferably at least one of R1 to R4 comprises F, CF3 or fluoroalkyl. Preferably the fluorinating agent comprises a nucleophiiic fluorinating agent. Preferred examples of fluorinating agents include HF and complexes of HF with nitrogen containing species, such as Olah’s reagent (HF:Pyridine complex), with urea, or with a tertiary amine. The method may comprise reacting an epoxide of 3,3,3-Trifluoropropene (1243zf) with HF and/or Olah’s reagent to form CF3CH(OH)CH2F. OH F HF E 3U The method may comprise reacting an epoxide of 1,3,3,3-Tetrafluoropropene (1234ze) with HF and/or Olah’s reagent to form CF3CH(OH)CHF2. OH F ” F3C —F The method may comprise reacting an epoxide of 1,1,1,4,4,4-hexafluoro-2-butene (1336mzz) with HF and/or Olah’s reagent to form CF3CH(OH)CHF(CF3). SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 3 PCT/GB2020/050701 The method may comprise reacting an epoxide of 1,1,3,3,3-Pentafluoropropene (1225zc) with HF and/or Olah’s reagent to form CFsCHfOHJCFs. COMPOUNDS & COMPOSITIONS OF THE INVENTION According to a second aspect of the invention there is provided compounds with the structure OH F F OH R1 R3 R2 R4 R2 R4 wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, i, CF3, alkyl, fluoroalkyl, haloalkyl, with the provision that the compound is not 1,1,1,3- tetrafluoropropan-2-ol. The compounds of the second aspect of the invention may be used in the preparation of a carbonate ester. According to a third aspect of the invention there is provided a method for preparing a partially fluorinated carbonate ester with the structure R4 F F R4 R2 —O q_ R2 R1 O R1 comprising reacting a fluorohydrin SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 4 PCT/GB2020/050701 OH F R1—— ——R3 R2 R4 F OH R1—— ——R3 R2 R4 wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalky!, haloalkyl with COX2, wherein X is selected from the group comprising -F, -Cl, -OCH3, -OCCI3, imidazole, succinimidyl. Preferably 2 equivalents (on a molar basis) of the fluorohydrin are used per 1 equivalent of COX2. Alternatively, 1 equivalent of the fluorohydrins of this invention maybe used with 1 equivalent of an alcohol species (a branched or linear monohydric/polyhydric alcohol) to prepare asymmetric carbonate esters. The compounds produced in a method according to the third aspect of the invention are covered by the fourth aspect of the invention. According to the fourth aspect of the invention there is provided a compound with the structure R3 R3 p4 c c p4 1 k p2 3 1 ix 1 \ F U c U ) F wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl. The compounds of the fourth aspect of the invention may be also used as a battery solvent component (e.g. in a lithium ion battery). Here the compounds are found to be beneficial as a result of their physical properties, electrochemical stability, compatibility with battery components such as battery electrodes (cathodes and anodes) including electrodes comprising carbon and silicon, lithium containing electrolyte salts, separators, binders, current collectors and low flammability. SUBSTITUTE SHEET (RULE 26)GA 03133765 2021-09-15 WO 2020/188274 5 PCT/GB2020/050701 The compounds of the fourth aspect of the invention may aiso be used with other solvents and additives such as other linear and cyclic carbonate esters. Preferably when used as a solvent the composition comprises an electrolyte salt. Preferred examples of electrolyte salts include lithium-based electrolytes such as those selected from the group comprising lithium hexafluorophosphate (LiPFe), lithium triflate (USO3CF3), lithium bis(fluorosulfonyl)imide (Li(FSO2)2N) and lithium bis(trifluoromethanesulfonyi)imide (Li(CF3SO2)2N). The compounds of the second aspect of the invention may be used in the preparation of a (more highly) fluorinated derivative. One or more of the R groups may be substituted by fluorine. In the process the R groups to be altered by fluorination are preferably selected from the group comprising H, Cl, Br, I. Depending on the nature of the R group(s) being modified the preparation process for the fluorinated derivative may comprise a multi-stage process; preferably a two-stage process. In a preferred two stage process a first stage is the modification of the targeted R group(s) to a (different) halogen group, preferably to a chlorine group (with a suitable chlorinating agent such as chlorine); in a second stage the chlorine group is modified to a fluorine group (with a suitable fluorinating agent such as HF or a metal fluorine salt, such as NaF, KF). It will be appreciated that where the R group(s) targeted already comprises a halogen, other than fluorine, a twostage process with substitution of the halogen with chlorine may not be necessary. Thus compounds OH F F OH R1 R3 R1_ R3 R2 R4 R2 R4 wherein at least 2 of R1 to R4 independently comprises H, Cl, Br, I may be converted to (more highly) fluorinated derivatives. In the fluorinated derivatives preferably at least 2 and more preferably at least 3 of R1 to R4 independently comprises F, CFsor a fluoroalkyl. Preferably at least 1 of R1 to R4, and more preferably 1 of R1 to R4 independently comprises H. Most preferably 1 of R1 to R4 comprises SUBSTITUTE SHEET (RULE 26)CF, WO 2020/188274 CA 03133765 2021-09-15 6 PCT/GB2020/050701 CF3, two of R1 to R4 comprise F and one of R1 to R4 comprises H. Most preferably the fluorinated derivative comprises hexfluroroisopropanol. A preferred reaction pathway occurs for the compound wherein in the preferred alternatives • R1 is -CF3, R2 is H and both R3 and R4 are H. • R1 is -CF3, R2 is H; one of R3 and R4 is H, one of R3 and R4 is F. This preferred pathway is shown below. X is either F or Cl. The epoxides useful in the first aspect of the invention may prepared from a fluorinated alkene. According to a fifth aspect of the invention there is provided a method for preparing a partially fluorinated epoxide, comprising reacting a fluorinated alkene: wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl with an oxidising agent. SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 7 PCT/GB2020/050701 Preferably at least one of R1 to R4 comprises F, CF3 or fluoroalkyl. Preferred examples of oxidising agent include air, oxygen and oxygen containing compounds such as peroxides, per-salts and compounds of oxygen with other elements such as hypohalites. Preferably the oxidising agent comprises a hypohalite such as chlorite. Preferably, the compound reacted with the oxidising agent is a tetrafluoropropene. Most preferably, one of R1 and R2 is -CF3 and one of R3 and R4 is -F. Thus, the tetrafluoropropene is 1,3,3,3-Tetrafluoropropene (1234 ze) or 2,3,3,3-Tetrafluoropropene (1234yf). According to a sixth aspect of the invention there is provided a method for preparing a fluorohydrin comprising the fifth and the first aspects of the invention. According to a seventh aspect of the invention there is provided a method for preparing a partially fluorinated ether with the st R 'ucture 3 f 3 &4 02 J J JA comprising reacting a fluorohyc c R drin w )H 1 F nth the structure F F a. C)H Ft2 K r\ R4 R 2 f K !4 wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl. According to an eighth aspect of the invention there is provided a compound with the structure R 3 P3 R* F F R4 n02 V R? R1 F SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 8 PCT/GB2020/050701 wherein R1, R2, R3 and R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl. According to a ninth aspect of the invention there is provided a composition comprising a compound of the eighth aspect of the invention. The compound of the eighth aspect of the invention or the composition according to the ninth aspect of the invention may be used as a solvent, for example, in battery applications. The compound of the eight aspect of the invention or the composition according to the ninth aspect of the invention may be used as a coolant, for example, as an immersive coolant. Also provided is a method for preparing a partially fluorinated ether with the structure R3 R4- F R2—— ——OR5 R1 comprising reacting a fluorohydrin with the structure c p1 >H F- F p3 pi : c Ik Ik Ip3 k R2 R4 R2 R4 wherein R1, R2, R3, R4 are independently selected from the group comprising H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, haloalkyl and R5 is independently selected from the group CF3, alkyl, fluoroalkyl, perfluoroalkyl, haloalkyl perfluorohaloalkyl. Preferably the ether synthesis occurs via acid catalysed dehydration of the fluorohydrin. Alternatively the ether synthesis occurs via one or more of the following techniques: i. Alkoxy-de-halogenation - reaction of an alkyl halide with a fluorohydrin, preferably under basic conditions; SUBSTITUTE SHEET (RULE 26)WO 2020/188274 J PCT/GB2020/050701 ii. Alkoxy-de-sulphonyloxy-substitution -- reaction of an fluorohydrin sulphate with an alkoxide or fluorohydrin alkoxide; iii. Hydro, alkoxy-de-diazo-disubstitution- reaction of a fluorohydrin with a diazo compound; iv. Alkoxy-de-hydroxylation- dehydration of two alcohols to yield an ether with e.g. concentrated sulphuric acid; v. Hydroxy or alkoxy-de-alkoxyiation- transetherification of a (fiuorohydrin)ether with an alcohol or fluorohydrin; and / or vi. Alkoxy-de-hydroxylation- reaction of an alcohol or fluorohydrin with an oxonium compound. Additionally provided is a compound with the structure R3 R4———F R2 qR5 R Further provided is a composition comprising a compound with the structure R3 R4 F R2 qR5 R1 The compound or the composition may be used as a solvent, for example, in battery applications. The compound or the composition may be used as a coolant, for example, as an immersive coolant. The invention will now be illustrated with reference to the following non-limiting examples. SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 10 PCT/GB2020/050701 Examples Example1- Rina opening of an epoxide with Olah’s reagent The following steps were followed. ® The reactor was charged with Olah’s reagent (70 % HRPyridine, 5 ml) and cooled in an ice batch with stirring. ® 2,3-epoxy1,1,1-trifluoropropane (TFPO) (3.4 g) was then added dropwise. ® At the end of the addition the reaction mixture was allowed to warm up to room temperature; stirring was continued for 48 hours. ® After 48 hours the reaction mixture was quenched with ice. ® Salt was added, and the product extracted with diethyl ether (3x5 ml). The diethyl ether extracts were combined, washed with saturated potassium bicarbonate solution and water before being dried over anhydrous sodium sulphate. Diethyl ether was removed in vacuo to yield the desired product as a clear, colourless liquid boiling point 91-93°C. The identity of this product was confirmed by NMR spectroscopy. SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 11 PCT/GB2020/050701 Example 2- Ring opening of 2,3-epoxy-1.1,1,3-tetrafluoropropane with Olah’s reagent Olah’s Reagent 9». OH chf2 H 2,3-epoxy-1,1,1,3-tetrafluoropropane was ring opened using the following procedure: • A 100 mi Hastalloy C pressure reactor was charged with Olah’s reagent (70 % HF:Pyridine, 25 g). ® After sealing, the contents of the reactor were cooied to 20°C with stirring. ® 2,3-epoxy-1,1,1,3-tetrafluoropropane (11 g) was then added. « After this addition was complete the reaction mixture was heated to 50°C and stirred for 168 hours. ® After 168 hours the reaction mixture was quenched with ice and saturated sodium chloride solution (22 ml) added. ® The product was extracted from this mixture with diethyl ether. ® The diethyl ether extracts were combined, washed with saturated potassium bicarbonate solution and then water before being dried over anhydrous sodium sulphate. The identity of the product was confirmed by NMR spectroscopy. Example 2a- Ring opening of 2,3-epoxy-l,1,1,3-tetrafluoropropane with Olah’s reagent Olah's Reagent. OH CF3 CHF2 H 2,3-epoxy-1,1,1,3-tetrafluoropropane was ring opened using the following procedure: ® A 100 ml Hastalloy C pressure reactor was charged with Olah’s reagent (70 % HF:Pyridine, 25 g). • After sealing, the contents of the reactor were cooled to 20°C with stirring. » 2,3-epoxy-1,1,1,3-tetrafluoropropane (10.6 g) was then added. • After this addition was complete the reaction mixture was heated to 80°C and stirred for 43 hours. ® After 43 hours a sample of the reaction mixture was analysed by GCMS and it was found that all the feed epoxide had reacted. ® After cooling the reaction mixture was quenched with ice and saturated sodium chloride solution (22 ml) added. ® The product was extracted from this mixture with diethyl ether. ® The diethyl ether extracts were combined, washed with saturated potassium bicarbonate solution and then water before being dried over anhydrous sodium sulphate. The identity of the product was confirmed by NMR spectroscopy. SUBSTITUTE SHEET (RULE 26)WO 2020/188274 CA 03133765 2021-09-15 12 PCT/GB2020/050701 Example 3 - Ring opening of 2,3-epoxy-1,1,1-trifiuoro-2-(trifiuoromethvl)propane with Olah’s reagent Olah's Reagent -——————— OH CF3___^_™_™CH2F cf3 2,3-epoxy-1,1,1-trifluoro-2-(trifluoromethyl)propane was ring opened using the foilowing procedure: « A 100 ml Hastailoy C pressure reactor was charged with Olah’s reagent (70 % HFPyridine, 16.5 g). ® After sealing, the contents of the reactor were cooled to 20°C with stirring. ® 2,3-epoxy-1,1,1-trifluoro-2~(trifluoromethyl)propane (10 g) was then added. ® After this addition was complete the reaction mixture was heated to 50°C and stirred for 160 hours. ® After 160 hours the reaction mixture was quenched with ice and saturated sodium chloride solution (22 ml) added. ® The product was extracted from this mixture with diethyl ether. ® The diethyl ether extracts were combined, washed with saturated potassium bicarbonate solution and then water before being dried over anhydrous sodium sulphate. The identity of the product was confirmed by NMR spectroscopy. Example 4 ~ Preparation of di-(1,1,1,3-tetrafluoropropvi) carbonate with phosgene Di-(1,1,1,3-tetrafluoropropyl) carbonate was synthesised using the following procedure: ® A three necked round bottom flask was cooled to 0°C under an inert atmosphere. • Phosgene solution (15% by weight in toluene, 50 mL of solution) was added and stirred. ® A mixture of 1,1,1,3-tetrafluoropropan-2-ol (18.42 g) and pyridine (11.02 g) was added to the solution dropwise, and the temperature of the solution was monitored to ensure it did not rise above 10°C. ® The solution was allowed to warm to room temperature and stirred for 48 hours. ® The product was filtered to remove pyridinium salts and the solvent was removed in vacuo to yield the crude product. ® The crude product was distilled under atmospheric conditions to yield di-(1,1,1,3-tetrafluoropropyl) carbonate as a yellow oil (7.08 g, 35 % yield). SUBSTITUTE SHEET (RULE 26)GA 03133765 2021-09-15 WO 2020/188274 13 PCT/GB2020/050701 Figures The Figures illustrates the results of various spectroscopic analytical techniques carried out on some of the reaction products from the Examples. Figure 1 shows a 19F NMR spectrum of the reaction product of 2,3-epoxy1,1,1-trifluoropropane (TFPO) with Olah’s reagent. Figure 2 shows a 1SF NMR spectrum of the reaction product of 2,3-epoxy-1,1,1,3- tetrafluoropropane ring opening with Olah’s reagent. Figure 2a shows a proton coupled and a proton decoupled 18F NMR spectrum of the reaction product of 2,3-epoxy-1,1,1,3-tetrafluoropropane ring opening with Olah’s reagent. Figure 3 shows a 18F NMR spectrum of the reaction product of 2,3-epoxy-1,1,1-trifluoro-2- (trifluoromethyl)propane) ring opening with Olah’s reagent. Figure 4 shows a WF NMR spectrum of the reaction product of 1,1,1,3-tetrafluoropropan-2-ol with phosgene, consistent with that of the product di-(1,1,1,3-tetrafluoropropyl) carbonate. SUBSTITUTE SHEET (RULE 26)

Claims (15)

14 Claims 1. A method for preparing a partially fluorinated alcohol, comprising reacting an epoxide: 0 R3 wherein R1, R2, R3 and R4 are independently selected from the group consisting of H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, and haloalkyl with a fluorinating agent; where one of R1 to R4 is -CF3, one of R1 to R4 is -F, and two of R1 to R4 are -H; or where two of R1 to R4 are -CF3 and two of R1 to R4 are -H; or where one of R1 to R4 is -CF3, one of R1 to R4 is -Cl, and two of R1 to R4 are -H.
2. The method according to claim 1, wherein R1 is -F, R3 is -CF3, and R2 and R4 are -H; or R1 is -F, R2 is -CF3, and R3 and R4 are -H.
3. The method according to claim 1, wherein R1 is -CF3 R3 is -CF3, and R2 and R4 are -H.
4. The method according to claim 1, wherein R1 is -Cl, R3 is -CF3, and R2 and R4 are -H; or R1 is -Cl, R2 is -CF3, and R3 and R4 are -H.
5. The method according to any one of claims 1-4, wherein the fluorinating agent comprises a nucleophilic fluorinating agent.
6. The method according to any one of claims 1-4, wherein the fluorinating agent is selected from HF and a complex of HF with nitrogen containing species, with urea, or with a tertiary amine.
7. The method according to claim 6, wherein the complex of HF with nitrogen containing species is an HF:Pyridine complex.
8. The method according to claim 7, wherein the HF:Pyridine complex is Olah’s reagent.
9. The method according to claim 7, wherein the ratio of HF to pyridine is 7:3 by weight. Date Refue/Date Received 2024-04-0515
10. A compound with the structure OH F F OH R2 R4 R2 R4 wherein R1, R2, R3 and R4 are independently selected from the group consisting of H, F, Cl, Br, I, CF3, alkyl, fluoroalkyl, and haloalkyl; where one of R1 to R4 is -CF3, one of R1 to R4 is -F, and two of R1 to R4 are -H; or where two of R1 to R4 are -CF3 and two of R1 to R4 are -H; or where one of R1 to R4 is -CF3, one of R1 to R4 is -Cl, and two of R1 to R4 are -H; formed by the method as claimed in any one of claims 1-9.
11. The compound according to claim 10, wherein R1 is -F, R3 is -CF3, and R2and R4 are -H; or R1 is -F, R2 is -CF3, and R3 and R4 are -H.
12. The compound according to claim 10, wherein R1 is -CF3 R3 is -CF3, and R2 and R4 are -H.
13. The compound according to claim 10, wherein R1 is -Cl, R3 is -CF3, and R2 and R4 are -H; or R1 is -Cl, R2 is -CF3, and R3 and R4 are -H.
14. Use of the compound as claimed in any one of claims 10-13 as a solvent
15. The use according to claim 14, wherein the use of the compound is as a solvent in battery applications. Date Refue/Date Received 2024-04-05
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