CN102093225A - Method for preparing acifluorfen by catalyzing and nitrifying with solid super acid - Google Patents

Method for preparing acifluorfen by catalyzing and nitrifying with solid super acid Download PDF

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CN102093225A
CN102093225A CN2010105703842A CN201010570384A CN102093225A CN 102093225 A CN102093225 A CN 102093225A CN 2010105703842 A CN2010105703842 A CN 2010105703842A CN 201010570384 A CN201010570384 A CN 201010570384A CN 102093225 A CN102093225 A CN 102093225A
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acid
acifluorfen
catalyst
trifluoromethyl
solid super
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朱红军
施路
章勤
吴涛
王凯
肖琪
王昆彦
陈琛
席彬斌
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Nanjing Tech University
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Nanjing Tech University
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    • YGENERAL 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
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Abstract

The invention discloses a method for preparing acifluorfen by catalyzing and nitrifying with solid super acid and relates to a preparation method of a nitro compound. The method comprises the following steps of: reacting 3-[2-chlorine-4-(trifluoromethyl) phenoxyl] benzoic acid and fuming nitric acid under the catalysis of solid super acid for 1-20 hours at 20-80 DEG C in the presence of acetic anhydride in dichloroethane; filtering and recovering a solid super acid catalyst; and layering, drying and evaporating the solution to obtain an acifluorfen product. In the invention, the used solid super acid is a load type super acid using metallic oxides as carriers, wherein the carriers comprise iron sesquioxide, titanium dioxide and zirconium dioxide. Compared with the traditional mixed acid nitrification, the method has the advantages of high yield, good selectivity, easiness of product separation, catalyst recycling capability and low environmental pollution and has industrial application prospect.

Description

The nitrated method for preparing acifluorfen of a kind of solid superacid as catalyst
Technical field
The present invention relates to a kind of preparation method of nitro-compound, be specifically related to a kind of with solid super-strong acid as catalyzer, catalytic nitration 3-[2-chloro-4-(trifluoromethyl) phenoxy group] phenylformic acid prepares the method for acifluorfen.
Technical background
Acifluorfen is the widely used weedicide efficiently of a class, also is the intermediate of synthetic other agricultural chemicals.At present, the nitrated technology of industrial widely-used nitric-sulfuric acid is to 3-[2-chloro-4-(trifluoromethyl) phenoxy group] phenylformic acid carries out nitrated making (WO9710199), mainly there is the problem of two aspects in this technology: the one, and no nitrated selectivity, the production cost of reaction mixture and isomer separation is very high; The 2nd, spent acid recycling difficulty in reaction back produces a large amount of acid-bearing wastewaters during aftertreatment, etching apparatus not only, and cause serious environmental to pollute.
In recent years with SO 4 2-/M xO yUse at catalytic field for the solid super-strong acid of feature and to have obtained extensive studies (Hino M, Arata K.Catalysis letters, 1995,30 (1): 25-30.), because solid super-strong acid has the acidity stronger than 100% sulfuric acid, and have the catalytic activity height, high temperature resistant, preparation is easy, be easy to separate and reusable, advantage such as environmental pollution is little, and the nitrated acid catalyzed reaction that waits is shown good catalytic activity, has obtained people's extensive concern.1979, reported first such as Japanese scholar M.Hino SO 4 2-/ M xO yThe preparation method of type solid super-strong acid, and use it for catalysis isomerization of paraffins reaction, demonstrate very high catalytic activity (Hino M, et al.J Am Chem Soc, 1979,101:6439.).Xi Limin etc. are with SO 4 2-/ ZrO 2The nitrated preparation oil of mirbane that is used for catalysis benzene, the result shows, and when catalyst activation temperature is 650 ℃, nitric acid and benzene mole are than 2.0, and yield reaches 78.3% and (uses chemical industry, 2005,34 (10): 603-605).SO such as Pan Shengcheng 4 2-/ TiO 2The solid superacid as catalyst nitration of toluene prepares nitrotoluene, shows catalytic activity and selectivity preferably, and the transformation efficiency of toluene reaches 81%, and catalyzer can be by roasting regeneration (Speciality Petrochemicals progress, 2003,4 (6): 17-19).Xi Limin etc. find to use solid super-strong acid SO 4 2-/ Fe 2O 3Catalytic nitration benzene prepares oil of mirbane, has catalytic activity preferably, and nitrated yield reaches 83.9% (Industrial Catalysis, 2006,14 (2): 31-34).Wang Tao etc. synthesize polynite, molecular sieve, silicon oxide, aluminum oxide a kind of super acids of loading type as carrier, the green nitration that is used for diphenyl ether derivative, demonstrate catalytic activity preferably, yield is 74.3%, product content is 81.1% (CN101165043), but this invention still fails to solve the low problem of nitrated preparation acifluorfen selectivity.The present invention has extensively screened various super acids on the basis of forefathers' research, finding to adopt with ferric oxide, zirconium dioxide and titanium dioxide is the solid super-strong acid of carrier, catalysis 3-[2-chloro-4-(trifluoromethyl) phenoxy group] the nitrated preparation acifluorfen of phenylformic acid, has higher selectivity, selectivity can be increased to 92%, yield is 88%, and bibliographical information is not seen in relevant research, and possesses good industrial prospect.
Summary of the invention
The objective of the invention is to be that the solid super acid catalyst of carrier is applied in the technology of nitrated preparation acifluorfen with ferric oxide, zirconium dioxide and titanium dioxide, substitute traditional sulfuric acid, be bordering on sulfuric acid even be higher than vitriolic transformation efficiency and selectivity in the hope of obtaining, reduce environmental pollution simultaneously.
In the preparation process of the used solid super-strong acid of the present invention, a certain amount of metal oxide carrier is immersed in the certain density sulfuric acid, behind the dipping certain hour, gets through filtration, drying, grinding, roasting.In the preparation process of acifluorfen, in the reaction vessel of placing ethylene dichloride, add 3-[2-chloro-4-(trifluoromethyl) phenoxy group] phenylformic acid, add a certain amount of solid super acid catalyst and a certain amount of acetic anhydride again, stir 10-30min, in 5-10min, temperature is-drip a certain amount of nitrosonitric acid under the 10-10 ℃ condition, be warming up to 20-80 ℃ of stirring reaction 1-20h again, the filtered and recycled solid super acid catalyst, tell organic phase, water layer extracts with ethylene dichloride, merges organic layer, drying, distillation removes solvent and obtains the product acifluorfen.
In the above-mentioned solid super strong acid preparation process, metal oxide carrier is TiO 2, Fe 2O 3Or ZrO 2Carrier is immersed in the sulphuric acid soln that concentration is 0.25-0.75mol/L with the amount of 2-30g/mL; Dipping time is 1-8h; Be ground to the 100-500 order; Maturing temperature is 400-700 ℃.
The consumption of above-mentioned solid super acid catalyst is 3-[2-chloro-4-(trifluoromethyl) phenoxy group] 10-80% of phenylformic acid weight; Acetic anhydride and 3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic mol ratio is 1.2-2.5: 1; Nitrosonitric acid and 3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic mol ratio is 1.0-1.6: 1.
The present invention is 3-[2-chloro-4-(trifluoromethyl) phenoxy group in reaction process] benzoic transformation efficiency is 90-100%, and product yield is 80-90%, and HPLC detects purity greater than 90%.
In the method for the present invention, reaction formula is as follows:
Figure BSA00000370493100041
Method of the present invention has the advantage that catalytic activity height, simple to operate, product are easy to separate, catalyzer is reusable and environmental pollution is little, is suitable for suitability for industrialized production.
Embodiment
Below by concrete example the present invention is described in detail.
Embodiment 1-9 is the method for preparing the solid super-strong acid of using as catalyzer in the acifluorfen.
Embodiment 1:SO 4 2-/ ZrO 2The preparation of solid super acid catalyst
Get 40g zirconium oxychloride solid, be configured to 10% zirconium oxychloride aqueous solution with deionized water.Transfer pH to 9-10 to wherein slowly dripping strong aqua under stirring at room, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till (silver nitrate solution with 0.1mol/L detects) detects.Filter cake is dry 14h under 110 ℃, floods with 0.25mol/L sulfuric acid in the 5mL/g ratio, and dipping time is 1h, filters back oven dry under 110 ℃ and spends the night, and is ground to 100 orders, 550 ℃ of roasting 3h, and taking-up is put into moisture eliminator and is cooled off, and obtains 14g SO 4 2-/ ZrO 2
Embodiment 2:SO 4 2-/ TiO 2The preparation of solid super acid catalyst
Get 30g TiCl 4Add lentamente in 0 ℃ the 0.2mol/L hydrogenchloride deionized water solution, be configured to 20% solution.Slowly drip strong aqua under the stirring at room and transfer pH to 9-10, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till detecting (silver nitrate solution with 0.1mol/L detects), filter cake is dry 14h under 110 ℃, flood with 0.25mol/L sulfuric acid in the 10mL/g ratio, dipping time is 1h, filter back oven dry under 110 ℃ and spend the night, be ground to 200 orders, 500 ℃ of roasting 3h, taking-up is put into moisture eliminator and is cooled off, and obtains 11.7g SO 4 2-/ TiO 2
Embodiment 3:SO 4 2-/ Fe 2O 3The preparation of solid super acid catalyst
Get 100g iron nitrate hydrate, be configured to 10% iron nitrate aqueous solution with deionized water.Slowly drip strong aqua under the stirring at room and transfer pH to 9-10, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till detecting (silver nitrate solution with 0.1mol/L detects), filter cake is dry 14h under 110 ℃, flood with 0.25mol/L sulfuric acid in the 15mL/g ratio, dipping time is 2h, filter back oven dry under 110 ℃ and spend the night, be ground to 300 orders, 500 ℃ of roasting 3h, taking-up is put into moisture eliminator and is cooled off, and obtains 20g SO 4 2-/ Fe 2O 3
Embodiment 4:SO 4 2-/ ZrO 2The preparation of solid super acid catalyst
Get 40g zirconium oxychloride solid, be configured to 10% zirconium oxychloride aqueous solution with deionized water.Transfer pH to 9-10 to wherein slowly dripping strong aqua under stirring at room, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till (silver nitrate solution with 0.1mol/L detects) detects.Filter cake is dry 14h under 110 ℃, floods with 0.25mol/L sulfuric acid in the 20mL/g ratio, and dipping time is 3h, filters back oven dry under 110 ℃ and spends the night, and is ground to 400 orders, 450 ℃ of roasting 3h, and taking-up is put into moisture eliminator and is cooled off, and obtains 14g SO 4 2-/ ZrO 2
Embodiment 5:SO 4 2-/ Fe 2O 3The preparation of solid super acid catalyst
Get 100g iron nitrate hydrate, be configured to 10% iron nitrate aqueous solution with distilled water.Slowly drip strong aqua under the stirring at room and transfer pH to 9-10, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till detecting (silver nitrate solution with 0.1mol/L detects), filter cake is dry 14h under 110 ℃, flood with 0.35mol/L sulfuric acid in the 25mL/g ratio, dipping time is 4h, filter back oven dry under 110 ℃ and spend the night, be ground to 300 orders, 650 ℃ of roasting 3h, taking-up is put into moisture eliminator and is cooled off, and obtains 21g SO 4 2-/ Fe 2O 3
Embodiment 6:SO 4 2-/ TiO 2The preparation of solid super acid catalyst
Get 30g TiCl 4Add lentamente in 0 ℃ the 0.2mol/L hydrogenchloride deionized water solution, be configured to 20% solution.Slowly drip strong aqua under the stirring at room and transfer pH to 9-10, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till detecting (silver nitrate solution with 0.1mol/L detects), filter cake is dry 14h under 110 ℃, flood with 0.45mol/L sulfuric acid in the 30mL/g ratio, dipping time is 5h, filter back oven dry under 110 ℃ and spend the night, be ground to 500 orders, 600 ℃ of roasting 3h, taking-up is put into moisture eliminator and is cooled off, and obtains 11.8g SO 4 2-/ TiO 2
Embodiment 7:SO 4 2-/ ZrO 2The preparation of solid super acid catalyst
Get 40g zirconium oxychloride solid, be configured to 10% zirconium oxychloride aqueous solution with deionized water.Transfer pH to 9-10 to wherein slowly dripping strong aqua under stirring at room, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till (silver nitrate solution with 0.1mol/L detects) detects.Filter cake is dry 14h under 110 ℃, floods with 0.55mol/L sulfuric acid in the 20mL/g ratio, and dipping time is 6h, and the oven dry of spending the night under 110 ℃ after filtering is ground to 400 orders, 700 ℃ of roasting 3h, and taking-up is put into moisture eliminator and is cooled off, and obtains 13g SO 4 2-/ ZrO 2
Embodiment 8:SO 4 2-/ Fe 2O 3The preparation of solid super acid catalyst
Get 100g iron nitrate hydrate, be configured to 10% iron nitrate aqueous solution with deionized water.Slowly drip strong aqua under the stirring at room and transfer pH to 9-10, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till detecting (silver nitrate solution with 0.1mol/L detects), filter cake is dry 14h under 110 ℃, flood with 0.65mol/L sulfuric acid in the 25mL/g ratio, dipping time is 7h, filter back oven dry under 110 ℃ and spend the night, be ground to 300 orders, 650 ℃ of roasting 3h, taking-up is put into moisture eliminator and is cooled off, and obtains 20g SO 4 2-/ Fe 2O 3
Embodiment 9:SO 4 2-/ TiO 2The preparation of solid super acid catalyst
Get 30g TiCl 4Add lentamente in 0 ℃ the 0.2mol/L hydrogenchloride deionized water solution, be configured to 20% solution.Slowly drip strong aqua under the stirring at room and transfer pH to 9-10, separate out a large amount of precipitations, the precipitation of formation is ageing 20h at room temperature.The ageing after-filtration is washed till no Cl with filter cake -Till detecting (silver nitrate solution with 0.1mol/L detects), filter cake is dry 14h under 110 ℃, flood with 0.75mol/L sulfuric acid in the 10mL/g ratio, dipping time is 8h, filter back oven dry under 110 ℃ and spend the night, be ground to 200 orders, 500 ℃ of roasting 3h, taking-up is put into moisture eliminator and is cooled off, and obtains 11g SO 42-/ TiO 2
Embodiment 10-25 is the example of solid super-strong acid as the nitrated preparation acifluorfen of catalyst.
Embodiment 10:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, (1.24mL 28mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions to temperature again in order to drip nitrosonitric acid under the-10-10 ℃ condition.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.14g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 98%, and product yield is 85%, and purity is 90%.
Embodiment 11:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ Fe 2O 3And acetic anhydride (2.8mL, 30mmol), stirring 20min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.21g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 86%, and purity is 91%.
Embodiment 12:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ TiO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.35g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 88%, and purity is 92%.
Embodiment 13:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 3g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.00g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 95%, and product yield is 83%, and purity is 90%.
Embodiment 14:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 4g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.06g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 99%, and product yield is 84%, and purity is 90%.
Embodiment 15:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 5g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 30 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.06g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 98%, and product yield is 84%, and purity is 91%.
Embodiment 16:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 3g solid super acid catalyst SO to phenylformic acid again 4 2-/ TiO 2And acetic anhydride (3.2mL, 34mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 30 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.35g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 99%, and product yield is 88%, and purity is 92%.
Embodiment 17:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 3g solid super acid catalyst SO to phenylformic acid again 4 2-/ TiO 2And acetic anhydride (3.6mL, 38mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 30 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.06g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 84%, and purity is 91%.
Embodiment 18:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 3g solid super acid catalyst SO to phenylformic acid again 4 2-/ TiO 2And acetic anhydride (4.0mL, 42mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.24mL 28mmol), is warming up to stirring reaction 4h under 30 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.14g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 85%, and purity is 91%.
Embodiment 19:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ Fe 2O 3And acetic anhydride (2.8mL, 30mmol), stirring 20min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.42mL 32mmol), is warming up to stirring reaction 4h under 30 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.21g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 86%, and purity is 91%.
Embodiment 20:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ Fe 2O 3And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.59mL 36mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.14g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 85%, and purity is 90.5%.
Embodiment 21:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.77mL 40mmol), is warming up to stirring reaction 4h under 30 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.14g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 99%, and product yield is 85%, and purity is 91%.
Embodiment 22:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.77mL 40mmol), is warming up to stirring reaction 4h under 40 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.14g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 99%, and product yield is 85%, and purity is 90%.
Embodiment 23:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.77mL 40mmol), is warming up to stirring reaction 8h under 50 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.50g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 90%, and purity is 94%.
Embodiment 24:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ Fe 2O 3And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.77mL 40mmol), is warming up to stirring reaction 12h under 60 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 6.06g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 97%, and product yield is 84%, and purity is 91%.
Embodiment 25:3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic nitration reaction
In the reaction vessel of placing the 15mL ethylene dichloride, adding 3-[2-chloro-4-(trifluoromethyl) phenoxy group] (6.32g 20mmol), adds 2g solid super acid catalyst SO to phenylformic acid again 4 2-/ ZrO 2And acetic anhydride (2.8mL, 30mmol), stirring 10min.In 5-10min, temperature is to drip nitrosonitric acid under the 5-10 ℃ of condition (1.77mL 40mmol), is warming up to stirring reaction 18h under 70 ℃ of conditions again.Stir and finish after-filtration recovery solid super acid catalyst, tell organic phase again, water layer extracts with ethylene dichloride, merges organic layer, drying, and distillation removes solvent and obtains product acifluorfen 5.92g.Learn 3-[2-chloro-4-(trifluoromethyl) phenoxy group by the HPLC analytical results] benzoic transformation efficiency is 100%, and product yield is 82%, and purity is 90%.
Though the present invention has been described in detail in detail, yet it is not to be used to limit the present invention with preferred embodiment.Any those skilled in the art under the situation that does not break away from the spirit and scope of the present invention, should make various modifications and change.Therefore protection scope of the present invention should be considered as appended claims institute restricted portion.

Claims (7)

1. one kind with the nitrated method for preparing acifluorfen of solid superacid as catalyst, it is characterized in that: in the reaction vessel of placing ethylene dichloride, add 3-[2-chloro-4-(trifluoromethyl) phenoxy group] phenylformic acid, add a certain amount of solid super acid catalyst and a certain amount of acetic anhydride again, stir 10-30min, in 5-10min, temperature is-drip a certain amount of nitrosonitric acid under the 10-10 ℃ condition, be warming up to 20-80 ℃ of stirring reaction 1-20h again, the filtered and recycled solid super acid catalyst, tell organic phase, water layer extracts with ethylene dichloride, merges organic layer, drying, distillation removes solvent and obtains the product acifluorfen.
2. a claim 1 is described a kind of with the nitrated method for preparing acifluorfen of solid superacid as catalyst, it is characterized in that: the preparation of used solid super-strong acid is that a certain amount of metal oxide carrier is immersed in the certain density sulfuric acid, behind the dipping certain hour, get through filtration, drying, grinding, roasting.
3. a claim 2 is described a kind of with the nitrated method for preparing acifluorfen of solid superacid as catalyst, and it is characterized in that: used metal oxide carrier is TiO 2, Fe 2O 3Or ZrO 2
4. a claim 2 is described a kind of with the nitrated method for preparing acifluorfen of solid superacid as catalyst, it is characterized in that: carrier is immersed in the sulphuric acid soln that concentration is 0.25-0.75mol/L with the amount of 2-30g/mL, dipping time is 1-8h, be ground to the 100-500 order, maturing temperature is 400-700 ℃.
5. a claim 1 is described a kind of with the nitrated method for preparing acifluorfen of solid superacid as catalyst, and it is characterized in that: the consumption of described solid super-strong acid is 3-[2-chloro-4-(trifluoromethyl) phenoxy group] 10-80% of phenylformic acid weight.
6. a claim 1 is described a kind of with the nitrated method for preparing acifluorfen of solid superacid as catalyst, it is characterized in that: described acetic anhydride and 3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic mol ratio is 1.2-2.5: 1.
7. a claim 1 is described a kind of with the nitrated method for preparing acifluorfen of solid superacid as catalyst, it is characterized in that: described nitrosonitric acid and 3-[2-chloro-4-(trifluoromethyl) phenoxy group] benzoic mol ratio is 1.0-1.6: 1.
CN2010105703842A 2010-12-02 2010-12-02 Method for preparing acifluorfen by catalyzing and nitrifying with solid super acid Pending CN102093225A (en)

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CN117865811A (en) * 2024-03-11 2024-04-12 山东道可化学有限公司 Method for preparing nitrobenzotrifluoride by continuously nitrifying benzotrifluoride

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CN117865811A (en) * 2024-03-11 2024-04-12 山东道可化学有限公司 Method for preparing nitrobenzotrifluoride by continuously nitrifying benzotrifluoride

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