CN1036132C - Reduction method for fluorohaloparaffin - Google Patents

Reduction method for fluorohaloparaffin Download PDF

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CN1036132C
CN1036132C CN93112482A CN93112482A CN1036132C CN 1036132 C CN1036132 C CN 1036132C CN 93112482 A CN93112482 A CN 93112482A CN 93112482 A CN93112482 A CN 93112482A CN 1036132 C CN1036132 C CN 1036132C
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fluorohaloparaffin
reducing
reaction
reductive agent
solvent
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CN1097190A (en
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黄维垣
谢银保
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Shanghai Institute of Organic Chemistry of CAS
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Shanghai Institute of Organic Chemistry of CAS
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/23—Preparation of halogenated hydrocarbons by dehalogenation

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Abstract

The present invention relates to a reduction method for fluoro halogen alkane, namely a method for fluoro halogen alkane to be reduced into hydrofluoric halogen alkane or hydrofluoric alkane under the existence of reducing agents and dehalogenation reagents with organic amine compounds with arc butt electrons on nitrogen atoms. The reduction method of the present invention has the advantages of high conversion rate, strong specificity, high reaction speed, mild reaction condition and low cost.

Description

A kind of method of reducing of fluorohaloparaffin
The present invention is the method for reducing of a sharp fluorohaloparaffin, can be used for preparing hydrogen fluorohaloparaffin or hydro fluoroalkanes.
Hydrogen fluorohaloparaffin or hydro fluoroalkanes occupy very consequence in fluorine chemistry industry.Rudimentary fluorohaloparaffin is as cooling agent, whipping agent, clean-out system and special high-efficiency fire-extinguishant.Because Chlorofluorocarbons (CFCs) (CFC) and Kazakhstan dragon (Halon) have great destruction to atmospheric ozone layer, their application is restricted day by day, and will be eliminated gradually, thereby the surrogate of exploitation Chlorofluorocarbons (CFCs) and Ha Long has become the important topic of various countries scientist research.Recent study shows, 1,1,1, and 2-Tetrafluoroethane (F134a) and Refrigerant 12 (F123) they are up-and-coming surrogates, and be very effective in refrigerator refrigeration, conditioning unit and sprays etc. are used.But these surrogates synthesize difficulty, expense is expensive.A kind of method is carried out the hydrogenation dehalogenation to original CFC product exactly, and the original reagent of going back of employing is metal reagent mostly, as LiAlH 4, H 2/ Pd-C, Ir-C, Pt/C, Al 2O 3Or ZnO 2Deng (JP 01,132, and 537; JP 02,129, and 130; JP 02,129,328, and EP 435,705; EP 364,103; DE3,917,573; WO 91 08, and 182), this method is temperature of reaction height, condition harshness, cost height not only, and the reaction specificity is poor.Another kind method is to fluoridize (EP 347,838) after the fluorohaloparaffin partial reduction (DE3834038) again, as uses Na 2SO 3The NaOH aqueous solution under comparatively high temps (95-105 ℃) and certain pressure with CF 3CClBr 2, CF 3CCl 3Deng partial reduction.Though this method cost is lower, reaction conditions is had relatively high expectations, complicated operation, and a halogen atom in only can redox molecule, and effect is not good yet.Hu Changming etc. have invented a kind of oxidation-reduction method, and with carbon-halogen bond reduction (CN90102865.7) in the fluorohaloparaffin, though this method temperature of reaction is low, method is easy, system is still complicated.So, still in the method for constantly exploring the reduction fluorohaloparaffin.
The method of reducing that the purpose of this invention is to provide a kind of fluorohaloparaffin.Fluorohaloparaffin can be in dehalogenation hydrogenation under the mild conditions in the presence of reductive agent and dehalogenation reagent, synthetic hydrogen fluorohaloparaffin or hydro fluoroalkanes.
Reductive agent among the present invention is the reductive agent that contains sulphur atom, and dehalogenation reagent is the organic amine compound that has lone pair electron on the nitrogen-atoms.In the presence of above-mentioned reductive agent, dehalogenation reagent and solvent, can be that the fluorohaloparaffin of CnWmClxBryIz is reduced into C with molecular formula nH F+g+zW mCl X-fBr Y-gWherein W=F or H, n=C1-12, m+x+Y+Z=2n+2, m, x, y or z=O-2n+2, f＜x, g＜y.The mole ratio of fluorohaloparaffin, reductive agent and dehalogenation reagent is 1: 0.2-10: 0.2-10.Adopting more, the former also agent and the dehalogenation reagent of volume also are favourable to reaction.
Have the amine chemical combination of lone pair electron and dehalogenation reagent on the nitrogen-atoms described in the present invention and can be primary, the second month in a season or tertiary amine, have the heterocyclic compound that has lone pair electron on alkane, oxyethylamine and the nitrogen-atoms of bifunctional primary, the second month in a season or tertiary amine.As molecular formula is RNH 2, RNHR 1, RR 1NR 11, NH 2R 111NH 2, R 2 111N (CH 2) hNR 2 1111, HOCH 2CH 2NH 2, Pyrrolidine, piperidines or morphine quinoline etc.Wherein R, R 1Or R 11Be the alkyl or aryl of C1-12, R 111Be the alkane subunit of C2-10, R 1111Be the alkyl of C1-4, h=2-8.As n-butylamine, lauryl amine, dibutylamine, diisooctyl amine, Trimethylamine 99, triethylamine, diethyl octyl amine etc.
The reductive agent that contains sulphur atom described in the present invention can be M 2S 2O 4, M 2S 2O 5, M 2SO 3, MHSO 3, HOCH 2SO 2M or NH 2C (SO 2) NH 2Deng.Wherein M is monovalence metal or ammonium ion.Be M=Li, Na, K, Rb, Cs, NH 4As reductive agents commonly used such as Potassium hydrogen sulfite, sodium bisulfite, ammonium bisulfite, V-Brite B (vat powder), potassium hyposulfite, potassium sulfite, S-WAT, ammonium sulphite, Sodium Metabisulfite, potassium metabisulfite, ammonium meta-bisulfite, rongalite, thiourea peroxides.
Adopt the method for reducing of fluorohaloparaffin of the present invention, different fluorohaloparaffins is discrepant on the activity that is reduced, and reductive agent organic amine, solvent types also influence the carrying out of reduction reaction.When adopting M 2S 2O 4, MHSO 3, HOCH 2SO 2M or NH 2(SO 2) NH 2The time, above-mentioned fluorine halide all can be converted into reduzate.When adopting MHSO 3Or M 2S 2O 5When making reductive agent, when not occurring one or more Cl, Br or I simultaneously on the α of fluorine halogen compound, the β position carbon atom, can obtain reduzate smoothly, but when occurring one or more Cl, Br or I simultaneously on α, the β position carbon atom, the reduzate that obtains is less, the dehalogenation sulfonation reaction mainly takes place in productive rate≤10%.
In the method for the invention, the mole ratio of fluorohaloparaffin and reductive agent and dehalogenation reagent normally 1: 0.2-10: 0.2-10.Further increase reductive agent or dehalogenation reagent and do not influence reaction substantially.Recommend their mole ratio to be followed successively by 1: 0.5-5: 0.5-5.
When adopting method of the present invention, temperature of reaction and time is with the boiling point and active change of different fluorohaloparaffins, is generally-20-150 ℃, and temperature is too low, and speed of response is too slow, and temperature is too high, and productive rate reduces, and by product increases, so recommended temperature is-10-120 ℃.Carbon-halogen bond of reduction at-10-30 ℃, just can be finished reaction usually in the fluorohaloparaffin molecule, will suitably improve temperature of reaction to 60-120 ℃ and reduce second and the 3rd carbon-halogen bond.In the method for the present invention, the general reaction times is 0.5-50 hour, recommends 1-10 hour.
When adopting method of the present invention, can one or more polarity or nonpolar solution in react.As the Fatty Alcohol(C12-C14 and C12-C18) of low carbon chain such as methyl alcohol, ethanol, chloroform, ether, acetone, acetonitrile, ethyl acetate, tetracol phenixin, dioxane, tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), dimethyl formamide, N,N-DIMETHYLACETAMIDE etc.In the above-mentioned solvent if contain the carrying out of dissolving each other, finally help reduction reaction that water will help reactant.
Adopt method of the present invention, use 19F nucleus magnetic resonance trace analysis shows that the reductibility of reduction system is strong, and after the reaction, isolated yield will be subjected to the influence of speed of response and separation purification method, and general isolated yield is between 70-95%.As use ClCF 2CFCl 2, at room temperature select appropriate reductant to prepare ClCF 2CFClH, isolated yield can reach 95%.Use CF 3CFBr 2Can obtain CF 5-10 ℃ of reaction 3CFBrH generates CF when improving temperature of reaction to 80-120 ℃ 3CFH 2, total recovery is greater than 74%.CF 3CCl 3At room temperature can obtain CF 3CHCl 2, improve temperature and can further obtain CF 3CH 2Cl and CF 3CH 3The inventive method is particularly useful for obtaining to think so far the surrogate F123 and the F134a in the most promising whipping agent and fluorine Lyons and the raw material CFClHCFClH of preparation perfluor benzene with high transformation efficiency.
Method of the present invention is the reaction conversion ratio height not only, and specificity is strong, and the reaction conditions gentleness, and is with low cost, all recyclable and repeated use of dehalogenation reagent and solvent, and also the suitability for industrialized production for fluorine Lyons surrogate and intermediate thereof opens up a new way.
Following embodiment will help further to understand the present invention, but not limit content of the present invention.
Embodiment 1:CF 2Cl-CFClH's is synthetic
CF with 18.8 grams (0.1mol) 2ClCFCl 2(F113), the M of 0.2-0.8mol 2S 2O 4, M is a monovalent metallic ion, the n-Butyl Amine 99 of 0.2-0.8mol, and the methyl alcohol of 90ml mixes the back and stirred 10 hours under room temperature, 19F NMR trace analysis transformation efficiency has reached 100%, distillation.Distillate washs with acidic aqueous solution, and lower floor's anhydrous sodium sulfate drying distills to such an extent that colourless transparent liquid 〉=15.3 restrain productive rate 95%, b.p.28-30 ℃.The product analysis result is as follows: 10F NMR, (TFA mark) δ :-8.4 (AB, 2F), 72.5 (dt, 1F) 1H NMR, (TMS mark) δ: 6.5 (dt, 1H) MS (m/z): 152,154 (M +, 10.0; 2.1), 132 (M +-HF, 14.7).
Embodiment 2:CFCl 2CFClH's is synthetic
22.8 the CFCl of gram (0.1mol) 2CFCl 2(F112), the triethylamine of 0.1-0.3mol, the thiourea peroxide of 0.2mol after the commercial product acetonitrile of 100ml mixes, stirred 14 hours distillation under room temperature.Distillate washs with acidic aqueous solution, lower floor's anhydrous sodium sulfate drying, and distillation obtains colourless transparent liquid 15.2 grams, productive rate 90%, b.p.74-76 ℃.The product analysis result: 19F NMR, δ :-7.0 (d, 1F), 64.3 (dd, 1F), 1H NMR, δ: 6.65 (dd, 1H) MS (m/z): 149 (M +-F).
Embodiment 3:HClFCCFClH's is synthetic
CFCl with 0.1mol 2CFCl 2, the rongalite of 0.1mol, the morphine quinoline of 0.5mol after 50ml ethyl acetate and 10ml water mix, reacted 5 hours distillation down in 70 ℃.Again through washing, drying and distillation purifying; Get 10.8 gram colourless transparent liquids, productive rate 80%, b.p.58-61 ℃, the product analysis result is as follows: 19F NMR, δ: 72.5 (A 2X 2, 2F), 1H NMR, δ: 6.15 (dm, 2H) MS (m/z): 134 (M +, 6.55), 136 (M +, 4.32), 115 (M +-F, 7.81),
117((M +-F，5.62)，67(100)。
Embodiment 4:CF 2Cl-CFClH
As embodiment 1, use NaHSO instead 3Or Na 2S 2O 5When making reductive agent, CF 2The productive rate of ClCFClH is 6-10% only.
Embodiment 5:CF 3CHCl 2Synthetic
CF with 0.1mol 3CCl 3, the Na of 0.15mol 2S 2O 4, the trioctylamine of 0.5mol, the DMF of 100ml and 50ml water mix the back and reacted 2 hours down in 0-5 ℃, distillation.Distillate washs with acidic aqueous solution, and the anhydrous sodium sulfate drying organic phase is distilled to such an extent that colourless transparent liquid 15.9 restrains, productive rate 95%, and b.p.28-31 ℃, if use NaHSO instead 3When making reductive agent and acetonitrile and making solvent, obtain 16.2 gram products, productive rate 96%.The product analysis result: 19F NMR, δ: 1.3 (S, 3F), 1H NMR, δ: 6.43 (g, H) MS (m/z): 152,154 (M +, 5.2,3.2), 133,135 (M +-F, 9.3,6.0),
117，119(M +-Cl，2.6，0.8)。
Embodiment 6:ClCF 2CF 2H's is synthetic
The ClCF of 26 grams (0.1mol) 2CF 2I, 0.2-0.5molNa 2S 2O 4, the N of 0.1-0.5mol, N-Diethyl Aniline or thanomin, the dioxane of 50-200ml mixes the back and reacted 5 hours down in 30 ℃, and HCF is collected in distillation in cold hydrazine 2CF 2Cl 10.4 grams, productive rate 76.5%, the product analysis result: 19F NMR, δ :-2.8 (S, 2F), 58.0 (d, 2F), 1H NMR, δ: 6.05 (td, 2H) MS (m/z): 119,117 (M +-F, 4.7,14.9), 101 (M +-Cl, 70.6),
86(M +-CF 2，54.0)。
Embodiment 7:CF 3CFBrH's is synthetic
The CF of 26 grams (0.1mol) 3CBr 2F, the Na of 0.2mol 2S 2O 5Or NaHSO 3, the morphine quinoline of 0.3mol, the tetrahydrofuran (THF) of 80ml mix the back and reacted 4 hours under room temperature, distillation.Distillate washs with acidic aqueous solution, the same anhydrous sodium sulfate drying of organic phase, and the distillation back gets colourless transparent liquid 14.8 grams in cold hydrazine, productive rate 82%, the product analysis result: 19F NMR, δ: 4.3 (S, 3F), 86.8 (d, 1F), 1H NMR, δ: 6.45 (dm, 1H) MS (m/z): 180 (M +, 6.94), 182 (M +, 8.16), 111 (M +-CF 3, 2.00),
113(M +-CF 3，2.11)，43(100)。
Embodiment 8:CF 3CFH 2Synthesizing (F134a)
CF with 0.1mol 3CBrHF, the NaHSO of 0.2mol 3.Na 2S 2O 4Or Na 2S 2O 5, the triethylamine of 0.5mol, the commercial product acetonitrile of 80-100ml was mixed in the autoclave, 120 ℃ of reactions 5-7 hour.Reactant distills through gas phase, collects liquid 8.1 grams in the cold hydrazine, productive rate 79.4%, and the product analysis result: 19F (CCl 4) NMR, δ: 2.0 (S, 3F), 162.0 (m, 1F), 1H (CCl 4) NMR, δ: 4.51 (dt, 2H)
Embodiment 9:CF 3CH 2Cl 3Synthetic
With embodiment 5, in the high-pressure section still, to react, temperature of reaction is 110 ℃, 7 hours reaction times, warp 19F NMR detects, and transformation efficiency is 92%, identifies through GC-MS, contains CF 3CClH 269.2%, CF 3CH 313.6%, other is 17.7% years old.The product analysis result:
19F?NMR.δ MS(m/z)CF 3CH 2Cl -5.2(3F) 118(M +，6.251)，120(M +，2.3)CF 3CH 3 -11.0(3F) 84(M +，68.5)，83(M +-1，24.0)
Embodiment 10:CF 3(CF 2) 9H's is synthetic
With 0.6 gram CF 3(CF 2) 9I, 0.3 gram KHSO 3, the 5ml triethylamine, 10ml acetonitrile and 2ml water mix the back after stirring 10 hours under the room temperature, filter, and low boilers is taken out in decompression.With methylene dichloride dissolving, saturated common salt water washing, anhydrous sodium sulfate drying filters, and extracts solvent, gets white cured shape solid 0.46 gram, productive rate 88.5%.The product analysis result: 19F (CDCl 3) NMR, δ: 4.3 (3F), 43.5-47.5 (12F), 49.3 (2F),
52.5(2F)，62.0(2F) 1H(CDCl 3)NMR，δ：5.5(tt，1H)。

Claims (8)

1. the method for reducing of a fluorohaloparaffin is included in solvent and sulfur-bearing reductive agent and has reaction down, it is characterized in that also existing dehalogenation reagent, is that the fluorohaloparaffin of CnWmClxBrylz is reduced into C with molecular formula nH F+g+zW mCl X-fBr Y-g, described reductive agent is M 2S 2O 4, MHSO 3, M 2S 2O 5, M 2SO 3, HOCH 2SO 2M or NH 2C (SO 2) NH 2Described dehalogenation reagent is the organic amine compound that has lone pair electron on the nitrogen-atoms, the mole ratio of fluorohaloparaffin, reductive agent and dehalogenation reagent is 1: 0.2-10: 0.2-10, wherein W=F, H, n=1-12, m+x+y+z=2n+2, m, x, y, z=0-2n+2, f＜x, g＜y, M are monovalence metal or ammonium ion.
2. the method for reducing of a kind of fluorohaloparaffin as claimed in claim 1 is characterized in that the mole ratio of described fluorohaloparaffin, reductive agent and dehalogenation reagent is 1: 0.5-5: 0.5-5.
3. the method for reducing of a kind of fluorohaloparaffin as claimed in claim 1, the organic amine compound that it is characterized in that having on the described nitrogen-atoms lone pair electron can be RNH 2, RNHR 1, RR 1NR 11, NH 2R 111NH 2, R 2 1111N (CH 2) hNR 2 1111, HOCH 2CH 2NH 2, Pyrrolidine, piperidines or morphine quinoline, wherein R, R 1Or R 11Be the alkyl or aryl of C1-12, R 111The alkane subunit of C2-10, R 1111Be the alkyl of C1-4, h=2-8.
4. the method for reducing of a kind of fluorohaloparaffin as claimed in claim 1 is characterized in that described solvent is one or more solvent.
5. the method for reducing of a kind of fluorohaloparaffin as claimed in claim 1 is characterized in that described solvent is an aprotic polar solvent.
6. the method for reducing of a kind of fluorohaloparaffin as claimed in claim 1 is characterized in that n=2-3 in the described fluorohaloparaffin molecular formula.
7. as the method for reducing of claim 1,2,3 or 4 described fluorohaloparaffins, it is characterized in that temperature of reaction is-20-150 ℃, the reaction times is 0.5-50 hour.
8. the method for reducing of fluorohaloparaffin as claimed in claim 7 is characterized in that temperature of reaction is-10-120 ℃, and the reaction times is 2-10 hour.
CN93112482A 1993-07-08 1993-07-08 Reduction method for fluorohaloparaffin Expired - Fee Related CN1036132C (en)

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JP6610625B2 (en) * 2017-07-31 2019-11-27 ダイキン工業株式会社 Method for producing 1,2-dichloro-1,2-difluoroethane (HCFC-132), method for producing 1-chloro-1,2-difluoroethylene (HCFO-1122a), and method for separating HCFC-132
CN108503638B (en) * 2018-04-25 2019-11-26 福建师范大学福清分校 A kind of method of cobalt catalysis polyhalo imidodicarbonic diamide Dehalogenation reduction

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3917573A1 (en) * 1988-05-30 1989-12-14 Central Glass Co Ltd METHOD FOR PRODUCING 1,1,1,2-TETRAFLUORETHANE FROM 1,1-DICHLOR-1,2,2,2-TETRAFLUORETHANE
EP0364103A1 (en) * 1988-09-26 1990-04-18 Imperial Chemical Industries Plc Production of fluorocarbons

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3917573A1 (en) * 1988-05-30 1989-12-14 Central Glass Co Ltd METHOD FOR PRODUCING 1,1,1,2-TETRAFLUORETHANE FROM 1,1-DICHLOR-1,2,2,2-TETRAFLUORETHANE
EP0364103A1 (en) * 1988-09-26 1990-04-18 Imperial Chemical Industries Plc Production of fluorocarbons

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