CN1157812A - Preparation method of 2-fluor-4-bromotoluene, 2-fluor-4-bromo benzyl bromide and its 2-fluor-4-bromo benzyl bromide - Google Patents
Preparation method of 2-fluor-4-bromotoluene, 2-fluor-4-bromo benzyl bromide and its 2-fluor-4-bromo benzyl bromide Download PDFInfo
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- CN1157812A CN1157812A CN 96114649 CN96114649A CN1157812A CN 1157812 A CN1157812 A CN 1157812A CN 96114649 CN96114649 CN 96114649 CN 96114649 A CN96114649 A CN 96114649A CN 1157812 A CN1157812 A CN 1157812A
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Abstract
A process for preparing 2-fluoro-4-bromotoluene and 2-fluoro-4-bromobenzyl bromide with para-aminotoluene as initial raw material includes such steps as forming salt, nitration, diazotization, bromo-substituted synthesis to obtain 2-nitro-4-bromotoluene, reduction, diazotization and fluorination to synthesize 2-fluoro-4-bromotoluene, and optical bromination to synthesize 2-fluoro-4-bromobenzyl bromide, and features simple operation, low cost and high output rate.
Description
The invention belongs to the product and the preparation of compound, the preparation method of particularly a kind of 2-fluoro-4-toluene bromide, 2-fluoro-4-bromo benzyl bromo and 2-fluoro-4-bromo benzyl bromo.
By retrieval, the preparation method of present on patent, non-patent literature, do not appear in the newspapers both at home and abroad 2-fluoro-4-toluene bromide, 2-fluoro-4-bromo benzyl bromo and 2-fluoro-4-bromo benzyl bromo, according to classical technology and theory, Synthetic 2-fluoro-4-bromo benzyl bromo can be by following route: (1) is raw material with the o-fluorotobuene, through mixed acid nitrification, reduction, diazotization, bromo-reaction, Synthetic 2-fluoro-4-toluene bromide carries out its product the light bromination reaction, Synthetic 2-fluoro-4-bromo benzyl bromo again.(2) with the para-bromo toluene be raw material, generate 2-fluoro-4-toluene bromide, again its product is carried out the light bromination reaction, Synthetic 2-fluoro-4 bromo benzyl bromos through mixed acid nitrification, reduction, diazotization fluoridation.But (1), raw material o-fluorotobuene and para-bromo toluene in (2) route, not only cost an arm and a leg, and be not easy to obtain; In addition, o-fluorotobuene and two Orientation Effect of Substituting Groups on the para-bromo toluene phenyl ring in (1), (2) route are all inconsistent, just have two kinds of products when nitrated and generate, and are difficult to separate, and influence the next step, have cost height, shortcoming that yield is low.
The objective of the invention is to overcome above technical deficiency, provide that a kind of raw material is easy to get, craft science, easy and simple to handle, cost is low, the preparation of industrialization compound 2-fluoro-4-toluene bromide that yield is high, the technology of 2-fluoro-4-bromo benzyl bromo.
The present invention relates to the halogenating reaction of alkylbenzene, i.e. halogenation on the phenyl ring and side chain halogenation, the sulfuric acid diazo on the bromine atoms substituted benzene ring in bromo-reaction enters phenyl ring generating structure (II) product 2-fluoro-4-toluene bromide; Hydroperoxyl radical on the bromine atoms substituted benzene ring side chain in the light bromination reaction, generating structure (I) product 2-fluoro-4-bromo benzyl bromo.With the para-totuidine is starting raw material, through salify, mixed acid nitrification, diazotization, bromo-reaction, and Synthetic 2-nitro-4-toluene bromide, again product is reduced, diazotization is fluoridized Synthetic 2-fluoro-4-toluene bromide, carries out light bromination reaction, Synthetic 2-fluoro-4-bromo benzyl bromo with bromine again.
Technology of the present invention is created and is that in the salt-forming reaction of para-totuidine and the vitriol oil, originally the amino on the phenyl ring becomes amino positive ion, has protected amino, prevent amino in nitration reaction by nitric acid oxidation.Amino positive ion is a meta-orienting group, and is consistent with the methyl orientation effect on the phenyl ring.Nitration reaction is the 90-100% that raw material adds theoretical nitration mixture amount with easy itrated compound para-totuidine, it is fully reacted needn't detect its reaction end.In diazotization reaction,, in nitrated material, drip quantitative sodium nitrite solution, accident reaction end below 20 ℃.Add sodium sulfide solution in reduction reaction, have reacting balance, aftertreatment is simple, the advantage that equipment is easy to seal.2-fluoro-4-toluene bromide is produced in the liquid phase pyrolysis.In the light bromination reaction, under the UV illumination of wavelength＞3000 , the feed ratio of control 2-fluoro-4-toluene bromide and bromine, the yield and the purity of raising 2-fluoro-4-bromo benzyl bromo.
The preparation method of 2-fluoro-4-bromo benzyl bromo may further comprise the steps successively:
Structural formula:
(I) is 2-fluoro-4-bromo benzyl bromo in the formula, (II) is 2-fluoro-4-toluene bromide.
Para-totuidine and vitriol oil salt-forming reaction, generate (VII) paratoluidine sulfate, drip mixed acid nitrification and generate (VI) 3-nitro-4-methyl aniline vitriol, in acidity, carry out diazotization reaction with Sodium Nitrite, generate (V) 3-nitro-4-methyl phenyl-hydrogen-sulfate diazonium salt, bromo-reaction in acidity, generate (IV) 2-nitro-4-toluene bromide, react with sodium sulphite, generate (III) 2-amino-4-toluene bromide, in anhydrous hydrogen fluoride, carry out the diazotization fluoridation, generate (II) 2-fluoro-4-toluene bromide with Sodium Nitrite, carry out the light bromination reaction, generate (I) 2-fluoro-4-bromo benzyl bromo.Salt-forming reaction is dissolved in salify in the sulfuric acid with para-totuidine at 0-35 ℃, time 1-2 hour.Nitration reaction was-5-+5 ℃ of 90-100% that drips theoretical nitration mixture amount, time 1-2 hour.Acid oil ratio 1.16-1.29: 1, nitration mixture is formed: sulfuric acid 52-55%, nitric acid 42-45%.Diazotization reaction was the sodium nitrite solution that drips 10-15% below 20 ℃, time 1-2 hour.Bromo-reaction drips diazonium liquid in the cuprous bromide solution for preparing, and temperature 70-100 ℃, time 0.5-1 hour, preparation resultant 2-nitro-4-toluene bromide.Reduction reaction adds the water of PH=7 in reduction kettle, 2-nitro-4-toluene bromide drips the sodium sulfide solution of the 20-25% prepare, after backflow 15-20 hour, through distill 2-nitrogen base-4-toluene bromide.The diazotization fluoridation adds anhydrous hydrogen fluoride, 2-amino-4-toluene bromide in fluoridizing still, temperature 8-12 ℃, time 1-2 hour, be cooled to below-5 ℃, suitable speed adds Sodium Nitrite and carries out diazotization, reacted 1-2 hour, temperature-3-+3 ℃, the intensification pyrolysis is to 35-45 ℃, be cooled to 15 ℃ after fluoridizing, separate neutralization, collect 60-80 ℃/0.1MPa cut, obtain resultant 2-fluoro-4-toluene bromide.Light bromination is reflected under wavelength＞3000 UV illumination, adds 2-fluoro-4-toluene bromide, is warming up to 160-180 ℃, reflux and drip bromine, 2-fluoro-4-toluene bromide and bromine weight feed ratio 4-6 down: 1,2 hours time, collect 110-120 ℃/0.1MPa cut, obtain 2-fluoro-4-bromo benzyl bromo.
Specify below in conjunction with embodiment
Embodiment 1
Salt-forming reaction is measured in the molten still of acid and is dropped into vitriol oil 160L, drips para-totuidine 50kg, and 0 ℃ of temperature, generates (VIII) 1 hour time.Nitration reaction drips nitration mixture 36.5L in nitrating pot, its weight percent concentration: sulfuric acid 52%, and nitric acid 45%, temperature-5 ℃, generates (VI) 1 hour time.Diazotization reaction uses the pressure of 0.1MPa that itrated compound (VI) is pressed in the diazotization still, drips sodium nitrite solution 230kg, concentration 10%, and 10 ℃ of temperature, generate (V) 1 hour time.Bromo-reaction is pressed into header tank with diazonium liquid (V), under reflux state, in the cuprous bromide solution for preparing, drip diazonium liquid (V), 70 ℃ of temperature, 0.5 hour time, lower the temperature 60 ℃ static, through crystallization, centrifugal bromo compound (IV) 40kg, gas chromatographic analysis content 95.75%, yield 39.6%.Drop into the water 25kg of PH=7 in reduction kettle, bromo compound (IV) 80Kg heats up then, the 20% sodium sulfide solution 280L that dropping prepares, the backflow reduction reaction got (III) product 35kg through steam distillation after 15 hours, stratographic analysis content 79.84%, yield 50.8%.In fluoridizing still, add anhydrous hydrogen fluoride 70kg, reduzate (III) 40kg, 8 ℃ of temperature, 1 hour time was cooled to below-5 ℃ then, and suitable speed adds Sodium Nitrite 16.5kg, intensification pyrolysis to 35 ℃, is cooled to 15 ℃ at 1 hour time after fluoridizing, separate neutralization, collect 60 ℃/0.1MPa cut, obtain colourless liquid (II) 18.5kg, stratographic analysis content 99.34%, boiling point 171-173 ℃, yield 77.1% is in the light bromination still, with wavelength＞3000 , under the UV illumination of optical throughput 8925 lumens, add 2-fluoro-4-toluene bromide 40kg, be warming up to 160 ℃, reflux state drips bromine 8kg, 2 hours time, 110 ℃/0.1MPa cut is collected in underpressure distillation, gets structure (I) white crystals 10kg, stratographic analysis content 99.23%, 32 ℃ of fusing points, yield 64.1%, total recovery 5.32%.
Embodiment 2
Salt-forming reaction is measured in the molten still of acid and is dropped into vitriol oil 160L, drips para-totuidine 50kg, and 35 ℃ of temperature, generate (VII) 2 hours time.Nitration reaction drips nitration mixture 36.5L in nitrating pot, its weight percent concentration: sulfuric acid 55%, and nitric acid 42%, temperature+5 ℃, generate (VI) 2 hours time.Diazotization reaction uses the pressure of 0.1MPa that itrated compound (VI) is pressed in the diazotization still, drips sodium nitrite solution 230kg, concentration 15%, and 18 ℃ of temperature, generate (V) 2 hours time.Bromo-reaction is pressed into header tank with diazonium liquid (V), under reflux state, in the cuprous bromide solution for preparing, drip diazonium liquid (V), 100 ℃ of temperature, 1 hour time, lower the temperature 60 ℃ static, through crystallization, centrifugal bromo compound (IV) 51kg, gas chromatographic analysis content 95.85%, yield 50.5%.Drop into the water 25kg of PH=7 in reduction kettle, bromo compound (IV) 80Kg heats up then, the 25% sodium sulfide solution 280L that dropping prepares, the backflow reduction reaction got (III) product 44kg through steam distillation after 20 hours, stratographic analysis content 84.22%, yield 63.8%.In fluoridizing still, add anhydrous hydrogen fluoride 70kg, reduzate (III) 40kg, 12 ℃ of temperature, 1 hour time was cooled to below-5 ℃ then, and suitable speed adds Sodium Nitrite 16.5kg, intensification pyrolysis to 45 ℃, is cooled to 15 ℃ at 1 hour time after fluoridizing, separate neutralization, collect 80 ℃/0.1MPa cut, obtain colourless liquid (II) 21.5kg, stratographic analysis content 99.12%, boiling point 171-173 ℃, yield 74.3% is in the light bromination still, with wavelength＞3000 , under the UV illumination of optical throughput 8925 lumens, add 2-fluoro-4-toluene bromide 40kg, be warming up to 180 ℃ of reflux states and drip bromine 8kg, 2 hours time, 120 ℃/0.1MPa cut is collected in underpressure distillation, get structure (I) white crystals 12kg, stratographic analysis content 99.42%, 32 ℃ of fusing points, yield 76.9%, total recovery 8.27%.
The present invention has the following advantages:
1, gained 2-fluoro-4-toluene bromide and 2-fluoro-4-bromo benzyl bromo product, purity is equal Greater than 99%.
2, two Orientation Effect of Substituting Groups are consistent in the nitration reaction, and accessory substance is few, avoids The isomer problem that is difficult to separate.
3, nitration reaction drips the 90-100% that the nitration mixture amount can be theoretical nitration mixture amount. No Need to detect its reaction end, easy and simple to handle.
4, a large amount of useless hydrofluoric acid that produces in the diazotising fluorination process is through SO3Method reclaims Recycling not only reduces cost of material, also reduces the spent acid discharge capacity simultaneously, also eliminates Environmental pollution.
5, process route of the present invention is not only in the three-step reaction product before bromo , all need not separate directly entering the next step, and need except the diazotising fluorinated product Outside refining, other step product need not made with extra care, and is beneficial to suitability for industrialized production.
Claims (9)
1, structural formula:
(I) is 2-fluoro-4-bromo benzyl bromo in the formula, (II) is 2-fluoro-4-toluene bromide.
2, the preparation method of 2-fluoro-4-bromo benzyl bromo may further comprise the steps successively:
Para-totuidine and vitriol oil salt-forming reaction, generate (VII) paratoluidine sulfate, drip mixed acid nitrification and generate (VI) 3-nitro-4-methyl aniline vitriol, in acidity, carry out diazotization reaction with Sodium Nitrite, generate (V) 3-nitro-4-methyl phenyl-hydrogen-sulfate diazonium salt, bromo-reaction in acidity, generate (IV) 2-nitro-4-toluene bromide, react with sodium sulphite, generate (1) 2-amino-4-toluene bromide, in anhydrous hydrogen fluoride, carry out the diazotization fluoridation, generate (II) 2-fluoro-4-toluene bromide with Sodium Nitrite, carry out the light bromination reaction, generate (I) 2-fluoro-4-bromo benzyl bromo.
3, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, salt-forming reaction is dissolved in salify in the sulfuric acid with para-totuidine at 0-35 ℃, time 1-2 hour.
4, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, nitration reaction was-5-+5 ℃ of 90-100% that drips theoretical nitration mixture amount, time 1-2 hour.Acid oil ratio 1.16-1.29: 1, nitration mixture is formed: sulfuric acid 52-55%, nitric acid 42-45%.
5, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, diazotization reaction was the sodium nitrite solution that drips 10-15% below 20 ℃, time 1-2 hour.
6, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, bromo-reaction drips diazonium liquid in the cuprous bromide solution for preparing, and temperature 70-100 ℃, time 0.5-1 hour, preparation resultant 2-nitro-4-toluene bromide.
7, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, reduction reaction adds water and the 2-nitro-4-toluene bromide of PH=7 in reduction kettle, the sodium sulfide solution of the 20-25% that dropping prepares, after backflow 15-20 hour, through distill 2-amino-4-toluene bromide.
8, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, the diazotization fluoridation adds anhydrous hydrogen fluoride, 2-amino-4-toluene bromide, temperature 8-12 ℃ in fluoridizing still, time 1-2 hour, be cooled to below-5 ℃, suitable speed adds Sodium Nitrite and carries out diazotization, reacts 1-2 hour, temperature-3-+3 ℃, the intensification pyrolysis is cooled to 15 ℃ to 35-45 ℃ after fluoridizing, separate neutralization, collect 60-80 ℃/0.1MPa cut, obtain resultant 2-fluoro-4-toluene bromide.
9, the preparation method of 2-fluoro-4-bromo benzyl bromo according to claim 2, light bromination is reflected under wavelength＞3000A UV illumination, add 2-fluoro-4-toluene bromide, be warming up to 160-180 ℃, reflux and drip bromine, 2-fluoro-4-toluene bromide and bromine weight feed ratio 4-6 down: 1,2 hours time, collect 110-120 ℃/0.1MPa cut, obtain 2-fluoro-4-bromo benzyl bromo.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96114649A CN1047377C (en) | 1996-12-17 | 1996-12-17 | Preparation method of 2-fluor-4-bromotoluene, 2-fluor-4-bromo benzyl bromide and its 2-fluor-4-bromo benzyl bromide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN96114649A CN1047377C (en) | 1996-12-17 | 1996-12-17 | Preparation method of 2-fluor-4-bromotoluene, 2-fluor-4-bromo benzyl bromide and its 2-fluor-4-bromo benzyl bromide |
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| CN1157812A true CN1157812A (en) | 1997-08-27 |
| CN1047377C CN1047377C (en) | 1999-12-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301946C (en) * | 2005-12-20 | 2007-02-28 | 阜新金鸿泰化工有限公司 | Preparation method of 2.3-difluoro-5-bromophenol |
| CN103012026A (en) * | 2012-12-21 | 2013-04-03 | 山西新天源医药化工有限公司 | Bromination reaction method |
| CN103664510A (en) * | 2013-10-22 | 2014-03-26 | 张亚峰 | Synthesis technology for parabromotoluene |
| CN113214041A (en) * | 2021-04-29 | 2021-08-06 | 河北唯达生物医药产业技术研究有限公司 | Novel method for preparing 3-iodine-2 bromotoluene |
| CN114591141A (en) * | 2022-04-08 | 2022-06-07 | 浙江永太科技股份有限公司 | Preparation method of 2,4, 5-trifluorobenzyl bromide |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2933985A1 (en) * | 1979-08-22 | 1981-04-09 | Bayer Ag, 5090 Leverkusen | NEW 4-FLUOR-3-PHENOXY-BENZYL ETHERS AND METHOD FOR THEIR PRODUCTION AND NEW INTERMEDIATE PRODUCTS FOR THIS AND METHOD FOR THEIR PRODUCTION |
| DE3008158A1 (en) * | 1980-03-04 | 1981-09-10 | Bayer Ag, 5090 Leverkusen | METHOD FOR PRODUCING 3-BROM-4-FLUORTOLUOL |
| JPS57197226A (en) * | 1981-05-30 | 1982-12-03 | Dainippon Ink & Chem Inc | Preparation of aromatic fluorine compound |
| DE3141659A1 (en) * | 1981-10-21 | 1983-05-05 | Bayer Ag, 5090 Leverkusen | METHOD FOR THE PRODUCTION OF FLUORAROMATS SUBSTITUTED IN O POSITION |
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1996
- 1996-12-17 CN CN96114649A patent/CN1047377C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301946C (en) * | 2005-12-20 | 2007-02-28 | 阜新金鸿泰化工有限公司 | Preparation method of 2.3-difluoro-5-bromophenol |
| CN103012026A (en) * | 2012-12-21 | 2013-04-03 | 山西新天源医药化工有限公司 | Bromination reaction method |
| CN103012026B (en) * | 2012-12-21 | 2015-07-22 | 山西新天源医药化工有限公司 | Bromination reaction method |
| CN103664510A (en) * | 2013-10-22 | 2014-03-26 | 张亚峰 | Synthesis technology for parabromotoluene |
| CN103664510B (en) * | 2013-10-22 | 2015-11-18 | 青岛文创科技有限公司 | A kind of synthesis technique of para-bromo toluene |
| CN113214041A (en) * | 2021-04-29 | 2021-08-06 | 河北唯达生物医药产业技术研究有限公司 | Novel method for preparing 3-iodine-2 bromotoluene |
| CN114591141A (en) * | 2022-04-08 | 2022-06-07 | 浙江永太科技股份有限公司 | Preparation method of 2,4, 5-trifluorobenzyl bromide |
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