CN1747910A - Process for production of iodine compounds and process for production of high-purity 5-iodo-2-methylbenzoic acid - Google Patents
Process for production of iodine compounds and process for production of high-purity 5-iodo-2-methylbenzoic acid Download PDFInfo
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Abstract
Provided is a production method for an iodine compound in which iodine is reacted with a substrate in the presence of a porous material having a pore diameter of 500 nm or less or in the presence of the above porous material and an oxidizing agent and a production process for high purity 5-iodo-2-methylbenzoic acid comprising an iodination reaction step carried out by the above-mentioned, a crystal precipitation and separation step in which a product is precipitated by adding water or cooling and then separated and a purification step in which crystal separated is recrystallized using an organic solvent. According to the production method for an iodine compound described above, iodine can be introduced into various substrates at a high selectivity. Since expensive metals and specific reagents do not have to be used, it can readily be carried out in an industrially scale, and the product having a high purity can be obtained. Further, the process comprising the iodination reaction, separation and purification steps described above makes it possible to readily obtain at a high yield, 5-iodo-2-methylbenzoic acid having a high purity which is useful in uses for functional chemical products such as medicines. The process of the present invention comprising iodination reaction, separation and purification steps is characterized by that it is simple in terms of a procedure and that the purification load is smaller, and it is very advantageous in industrially carrying out.
Description
Background of invention
The present invention relates to use iodine directly to reach the method that optionally prepares iodine compound, and the preparation technology of high purity 5-iodo-2-tolyl acid.Iodine compound is important compound, they be widely used as medicine as contrast medium and the therapeutical agent that is used for thyroid disease, the sanitary material that is used for antimycotic and antifungal purpose, electronic material, optical functional materials, etching reagent, be used for life science, electricity-, the catalyzer and the material of the chemical reaction in information-communication, environment and energy field.And except being used as medicine and agricultural chemicals, high purity 5-iodo-2-tolyl acid is the useful raw material that is used for various performance chemical.
Correlation technique
The compound that contains fluorine or iodine atom has the feature that does not observe in other halide-containings.For example, the fluorine atom size is little and electronegativity is big, and therefore, the stability of key and make them can be used for various field by the performance of its physiologically active that causes comprises medical science and electronic material.On the contrary, the size of iodine atom is big and be amphoteric element, and is considered to have multiple oxidation state.Compare with fluorine, chlorine and bromine, its oxidation potential is low, therefore, can expect the dependency of various reactive behavioies and function.In addition, iodine has lower toxicity, therefore, is widely used in many fields relevant with medicine, telecommunications, environment and the energy.
Well-known iodate method comprises, for example, carry out direct iodate with iodine or single iodine chloride, vapour phase oxyiodination and the method (K.Matsuoka that the compound with halogen atom is carried out halogen-iodine exchange with iodide such as HI, KI or alkaline metal iodide, Elements of Iodine, augment the revision second edition, 1992, Kasumigaseki Shuppan Co.Ltd. published).
The direct iodination of describing in above-mentioned Elements of Iodine is, for example, and with substrate (substrate) vitriolization, and to the method that wherein adds iodine; With the substrate vitriolization, and to the method that wherein adds alkaline metal iodide and basic metal iodate; With the method for using sulfur iodide and nitric acid to come the iodate aromatic ring.Yet in aforesaid method, the selectivity of reaction and yield are not gratifying, and do not describe various substrates and the effective iodate method of going in Elements of Iodine yet.
By iodinating example, it comprises as the aromatic carboxylic acid, and para Toluic Acid in sulfuric acid carries out direct iodinating method (Synthesis, No.5, p.748,1999) with single iodine chloride and Sulfuric acid disilver salt; Use sulfuric acid and single iodine chloride para Toluic Acid to carry out direct iodinating method (Russian Journal of Org.Chem., 34 (7), 1988) with identical method; (use MnO with the method for using Manganse Dioxide, potassium permanganate or nitric acid in acetate, (to carry out iodate) with iodine as oxygenant
2And KMnO
4Method: Bull.Chem.Soc.Japan, vol.72, p.115,1999, use HNO
3Method: Zh.Obsch.Khim.Ob shchest, vol.17, p.464,1972 and use H
2SO
4Method: J.Am.Chem.Soc., vol.90, p.6187,1968).
But, in above-mentioned use vitriolic method, carry out the direct iodinating method of phenylformic acid with single iodine chloride and Sulfuric acid disilver salt problems are arranged when reality is used, so that even to be reflected at when carrying out under the low temperature that closes on 0 ℃ selectivity all very low, yield has only 57%, and in addition, have to use expensive Sulfuric acid disilver salt.
In the direct iodate method of using sulfuric acid and single iodine chloride, use single iodine chloride of relative low price, but reaction yield only is about 43%.In addition, in many cases, except iodine, also can produce chlorine, be difficult to optionally carry out iodination reaction.
In addition, using Manganse Dioxide, potassium permanganate or nitric acid in acetate, to carry out in the iodinating method with iodine as oxygenant, in acetic acid solvent, do not use expensive Sulfuric acid disilver salt, and this reaction can relatively easily be carried out, but the selectivity and the yield of reaction are all may not can satisfactory.
In order to make halogenation, particularly the halogenating reaction of aromatic substance is not limited to optionally carry out iodination reaction, and the someone proposes to use zeolite.What propose is, for example, with chlorine benzene and single Benzene Chloride are being carried out the method (the open No.213815/2001 of Japanese Patent) that zeolite is used in chlorination when generating santochlor, come vapour phase oxychlorination by methane to generate the method (the open No.227850/1992 of Japanese Patent) of methyl chloride and generate the method (Japanese Patent discloses No.253929/1992) of santochlor with zeolite L Benzene Chloride under the coexistence of molecular oxygen with zeolite Y and L.
Observe in aforesaid method, by using zeolite, selectivity has improvement, still, does not also arrive gratifying degree.In addition, when halogen atom became bromine by chlorine, expectability had identical selectivity hardly.The existing situation of the selective halogenation technology with highly versatile that can not provide still exists at present.In addition, the somebody proposes in iodination reaction by using zeolite to improve optionally method.What can obtain is, for example, make the method that toluene and single iodine chloride react in the presence of zeolite (Catalysis Letters, vol.40, p.257,1996), wherein to naphthalene carry out the vapour phase oxyiodination generate the iodate naphthalene method (Journalof Catalysis, vol.147, p.186,1994) and generate the method (the open No.219241/1984 of Japanese Patent) of paradiiodobenzene by benzene or benzene iodide.
But, make in the method that toluene and single iodine chloride react in the presence of zeolite above-mentioned, because single iodine chloride is used for reaction, therefore, reaction product is the mixture of muriate and iodide, selectivity is not high.The method of naphthalene being carried out vapour phase oxyiodination generation iodate naphthalene is with relevant with the vapour phase oxyiodination by the method for benzene or benzene iodide generation paradiiodobenzene, and transformation efficiency does not reach 50%.
In addition, the somebody proposes to use X zeolite, Y and L to carry out the isomerized method of aromatics iodine compound (Japanese Patent 2559483 and 2559484).Aforesaid method can obtain target product, and still, the isomer different with target product is still quantitatively all quite abundant in kind, and it rests on the not really good level of selectivity.
Therefore, as everyone knows, in method in common, if in the isomerization of the direct iodate of liquid phase, vapour phase oxyiodination and aromatics iodide, use zeolite, selectivity obtains relative improvement, but but expectability effectively is used to introduce the method for iodine hardly, and existing situation is, fails to observe the specific highly selective iodate method of the aromatic substance that goes for having functional group.
First purpose of the present invention provides a kind of iodate method, and it allows required iodination reaction highly selective and carries out effectively, and highly versatile, can carry out industrial.
Next, the synthetic method of known 5-iodo-2-tolyl acid is, method (the Journal of theIndian Chemical Society that iodine and 2-tolyl acid are reacted under the coexistence of Sodium Nitrite and oleum, p.503-504,1930) and method (Journal of theChemical Society, Perkin Transactions I. that potassiumiodide and 2-tolyl acid are reacted under the coexistence of thallium trifluoroacetate (III), p.2405-2409,1974).But yield is low to moderate 18% in last method, and then the problem of a method is that yield is low to moderate 33% and in addition, uses to have very supervirulent thallium salt.These two kinds of methods all are not suitable for the commercial run of 5-iodo-2-tolyl acid.
Be considered to be suitable as the preparation technology of 5-iodo-2-tolyl acid, except aforesaid method, usually be acknowledged as aromatic substance iodate method in addition and make aromatic amine take off diazotizing so-called Sandmeyer reaction (Organic Syntheses, Collective VolumeII, p.351,1943), after carrying out chlorination or bromination, carry out method (the Organic Syntheses of iodine permutoid reaction, Collective Volume V, p.478,1973), with the method that single iodine chloride is reacted (Russian Journal of Organic Chemistry, 34 (7), p.997-999,1998).In the middle of these methods, Sandmeyer and halogen-exchange process need a plurality of steps, and therefore, the process complexity has a lot of problems when causing them as industrial mode.Use the technology of single iodine chloride to estimate and can react as a kind of simple one step of method, but its with have electron-withdrawing group, in the reaction as benzoic aromatic substance, reactive behavior is very low, and estimates not have high performance.For example, in above-mentioned Russian Journal ofOrganic Chemistry, carry out benzoic iodination reaction, the benzoic yield of 3-iodo-remains about 43%, like this, if it is applicable to the 2-tolyl acid, expectation can not obtain high yield.
In the preparation process of 5-iodo-2-tolyl acid, generate by product 3-iodo-2-tolyl acid, a kind of isomer, 5-iodo-2-tolyl acid are difficult to separate with it and obtain purifying.Therefore, the problem that wherein relates to is, product purity and separation yield are destroyed, yet, in any method in common shown in above the method that reduces the regional isomer amount of by-products is not shown all.Known method as regioselectivity ground separation of aromatic compounds is, method (the Catalysis Letters that single iodine chloride is reacted under the coexistence of zeolite, vol.40, p.257,1996), under the coexistence of zeolite, carry out the method (the open No.219241/1984 of Japanese Patent and open (the passing through PCT) No.502819/1989 of Japanese Patent) of oxyiodination, but, in the middle of their any all can not remain on gratifying level with the selectivity of reaction, and almost never known have contain the compound of inhaling the electricity base such as the reaction embodiment of 2-tolyl acid.
Second purpose of the present invention provides a kind of industrial production process, by this method, selectivity iodate by carrying out the 2-tolyl acid can obtain highly purified product at an easy rate, and the process that this method comprises is simple to generate highly purified 5-iodo-2-tolyl acid.
Summary of the invention
In order to address the above problem, the contriver has carried out research extensively and profoundly, find, suitably use specific oxygen acid such as acid iodide and Periodic acid as oxygenant, with porous material with regular pore structure, as poromerics such as coexistences such as zeolite betas, can be optionally iodate aromatic hydrocarbons not only, and the various substrates of iodate, as halogenide and carboxylic acid, this reaction is by using the 2-tolyl acid as substrate, at poromerics such as zeolite beta, the coexistence of iodine and acid iodide and/or Periodic acid is optionally carried out down, and by in conjunction with simple purification step as obtaining highly purified 5-iodo-2-tolyl acid at an easy rate by adding the crystallization that entry or cooling carry out.Therefore, the contriver has finished the present invention.
That is, the present invention relates to a kind of preparation method of iodine compound and the preparation technology of high purity 5-iodo-2-tolyl acid.
(1) a kind of preparation method of iodine compound, wherein iodine and substrate the aperture be 500nm or following porous material in the presence of, or in the presence of above-mentioned porous material and oxygenant, react.
(2) as the preparation method of above-mentioned (a 1) described iodine compound, wherein said porous material is that the aperture is the poromerics of 0.5-2nm.
(3) as the preparation method of above-mentioned (1) described iodine compound, wherein said porous material is the zeolite beta that zeolite beta maybe can comprise the element that is different from the Si, the Al that form skeleton and O.
(4) as the preparation method of above-mentioned (a 1) described iodine compound, wherein said porous material is the mesopore material that the aperture surpasses 2nm.
(5) as the preparation method of above-mentioned (a 1) described iodine compound, wherein said oxygenant is at least a compound that is selected from the oxygen acid of being made up of acid iodide, Periodic acid, persulfuric acid, persulphate, nitric acid and molecular oxygen.
(6) as the preparation method of above-mentioned (1) described iodine compound, wherein said substrate is by at least aly being selected from aromatic hydrocarbons, fused polycycle aromatic hydrocarbons, polycyclic aromatic hydrocarbons, containing by the compound of the heterocyclic hydrocarbon or derivatives thereof of following formula (1) expression and form:
R-Ar-X (1)
(wherein, R represents hydrogen atom, and halogen atom can have substituent alkyl, cycloalkyl or aryl; Ar represents aromatic monocyclic, encircles or fused rings more, or has the aromatic group of polynuclear plane or heterocyclic group; X represents hydrogen atom, halogen atom or be selected from the functional group of carboxyl, formyl radical, hydroxyl, nitro, methylol, cyano group, amino, alkoxyl group, alkoxy carbonyl, acyl group, acyloxy, alkyl sulphonyl and alkylsulfonyloxy; R and X can be identical or can exist a plurality of).
(7) as the preparation method of above-mentioned (a 6) described iodine compound, wherein said substrate is made up of at least a compound that is selected from the following stated: benzene, fluorobenzene, chlorobenzene, bromobenzene, benzonitrile, phthalonitrile, Isophthalodinitrile, toluene, dimethylbenzene, isopropyl benzene, biphenyl, naphthalene, anthracene, methylnaphthalene, dimethylnaphthalene, tolyl acid, mesitylenic acid, diphenic acid, biphenyl dicarboxylic acid, naphthoic acid, and naphthalic acid.
(8) as the preparation method of above-mentioned (2) described iodine compound, wherein iodine and 2-tolyl acid the aperture be the poromerics of 0.5-2nm and acid iodide and/or Periodic acid in the presence of react.
(9) preparation technology of high purity 5-iodo-2-tolyl acid, it is characterized in that comprising, carry out the step of iodination reaction by above-mentioned (8) described method, wherein by adding entry or cool off and then separate crystal settling and the separating step that product is precipitated out, and the purification step that wherein with organic solvent isolated crystal is carried out recrystallization.
(10) as the preparation technology of above-mentioned (a 9) described high purity 5-iodo-2-tolyl acid, the solvent that wherein is used for recrystallization is selected from any of acetate, acetate-water mixed solvent, 2-propyl alcohol and 2-propyl alcohol-water mixed solvent.
(11) by high purity 5-iodo-2-tolyl acid as above-mentioned (9) described prepared, wherein said purity is 99% or higher, and the total amount of iodine, iodine compound, inorganic salt and transistion metal compound in being included in the impurity form is 500ppm or lower.
Preferred forms of the present invention
At first, the preparation method of iodine compound of the present invention, it is characterized in that making iodine and substrate the aperture be 500nm or following porous material in the presence of, or in the presence of above-mentioned porous material and oxygenant, react.
Aromatic hydrocarbons, fused polycycle aromatic hydrocarbons, polycyclic aromatic hydrocarbons, contain heterocyclic hydrocarbon or derivatives thereof by following formula (1) expression and be suitable as substrate among the iodine compound preparation method of the present invention:
R-Ar-X (1)
In the formula (1), R represents hydrogen atom, and halogen atom can have substituent alkyl, cycloalkyl or aryl.Abovementioned alkyl, cycloalkyl or aryl are saturated, unsaturated, aliphatics or the alicyclic alkyl that contains 1-32 carbon atom, as methyl, ethyl, n-propyl, sec.-propyl, butyl, amyl group, hexyl, heptyl, octyl group, 2-ethylhexyl, decyl, cyclohexyl, dicyclohexyl, norcamphyl and decalyl.They can have functional group such as halogen, hydroxyl, nitro, amino and alkylsulfonyl.Described halogen atom is fluorine, chlorine, bromine or iodine.
In the formula (1), X represents hydrogen atom, halogen atom, carboxyl, hydroxyl, nitro, methylol, cyano group, amino, alkoxyl group, alkoxy carbonyl, acyl group, acyloxy, alkyl sulphonyl or alkylsulfonyloxy; R and X can be identical or can exist a plurality of.
Ar represents aromatic monocyclic, encircles or fused rings more, or has the aromatic group of polynuclear plane or heterocyclic group.
That is, can have substituent aromatic substance or have the heterocyclic hydrocarbon, halohydrocarbon, carboxylic acid, nitrile and alcohol are equivalent to the represented substrate of formula (1).More particularly, they comprise benzene, fluorobenzene, chlorobenzene, bromobenzene, benzonitrile, phthalonitrile, Isophthalodinitrile, toluene, dimethylbenzene, isopropyl benzene, biphenyl, naphthalene, anthracene, methylnaphthalene, dimethylnaphthalene, tolyl acid, mesitylenic acid, diphenic acid, biphenyl dicarboxylic acid, naphthoic acid, and naphthalic acid.
In a part of molecular structure of substrate, unsaturated double-bond can be comprised, as in tetrahydrobenzene and the thiophene, and wherein unsaturated triple bond can be comprised.Certainly, the present invention will be not limited to above-mentioned specific example.
In the preparation method of iodine compound of the present invention, be that 500nm or littler porous material use with substrate with the aperture.This porous material is at poromerics, mesopore material and has the compound that has the nano level aperture in the poromerics of so-called regular pore structure separately.
This structured material comprises zeolite, and it is known poromerics up to now.Its specific example comprises, uses the IUPAC representation, has the ABW of octatomic ring structure separately, AEI, AFX, APC, ATN, ATT, ATV, AWW, CHA, DDR, EAB, ERI, GIS, JBW, KFI, LEV, LTA, MER, MON, PAU, PHI, RHO, RTE, RTH and VNI, the CHI that has the nonatomic ring structure separately, LOV, RSN and VSV, the DAC that has the ten-ring structure separately, EPI, FER, LAU, MEL, MFI, MFS, MTT, NES, TON and WEI, the AFS that has the twelve-ring structure separately, AFY, ATO, CAN, GME, MAZ, MEI, MTW, OFF, RON and VET.More specifically, they comprise Chabazite, zeolite A, X, Y and L, mordenite, and zeolite beta.Preferred aperture is the compound of 0.5-2nm, preferred especially zeolite beta.
The Si atom of preferably wherein forming skeleton and the ratio of Al atom are 5 or bigger zeolite beta, and preferred especially wherein said ratio is the zeolite beta of 10-30.Wherein the ratio of Si atom and Al atom surpasses 30 zeolite beta and also can use, and can not produce any problem.What also be fit to use is the compound that replaced by other atoms of skeletal atom wherein, or by having introduced other atoms that are different from skeletal atom therein, as the compound of Na, K, Cs, Ca, Mg, Ti, Sn, Fe, Ni, Zn, Pd, Ag etc. as the mode of ion-exchange and dipping.
According to the size of substrate, preferably use the aperture to surpass the wide-aperture mesopore material of having of 2nm.The example is, for example mesoporous silica as, FSM-16, KSW-1 and KSM-2, MCM-41, MCM-48 and be commonly called the MCM-50 of MS41S, mesoporous aluminas, middle porous titanium dioxide and the organic silica mixture of mesopore.
In the preparation method of iodine compound of the present invention, use oxygenant in order to put forward the periodic reactive behavior.What be preferably used as oxygenant is acid iodide, Periodic acid, and nitric acid, persulfuric acid, persulphate such as Sodium Persulfate, Potassium Persulphate and ammonium persulphate contain the oxysalt of hydrogen peroxide and molecular oxygen, preferred especially acid iodide and Periodic acid.Described substrate preferably with contain the system of zeolite beta and acid iodide of from above-claimed cpd, selecting or Periodic acid and contain them and, if necessary, also contain the system iodate of mineral acid such as sulfuric acid or nitric acid.
Can carry out iodination reaction by batch systems, semi-batch system or continuous system, and this reaction can be carried out in liquid phase or gas phase system.But, consider effective use of reactor, the iodate of different oxyiodinations is preferably carried out in liquid phase usually.
The iodine amount that is used for iodination reaction is preferably 0.5 mole of every mole of target substrates or above iodine, and still, it is can be with stoichiometry excessive or be less than stoichiometric state and use.
Porous material with regular pore structure---poromerics and mesopore material, as the amount of zeolite preferably in per 1 weight part substrate 0.05-0.5 weight part scope.But,, will can not produce specific trouble, except cost effectiveness if use 0.5 weight part or above amount yet.
It is basis 0.01-1 mole that the consumption of oxygenant is preferably in the substrate, preferred especially 0.1-0.5 mole.In order to improve the transformation efficiency of substrate, mineral acid can be used in combination with preferred acid iodide or Periodic acid as oxygenant.If the consumption of mineral acid increases, then the selectivity of reaction reduces, therefore, and not preferably with its excessive use.When mineral acid such as sulfuric acid or nitric acid were used in combination with acid iodide or Periodic acid, it was basis 10 weight % or lower that its consumption is preferably in the substrate, preferred especially 1-2 weight %.
In order to quicken iodination reaction, not necessarily must use solvent, still,, preferably use solvent in order to improve reaction efficiency and mixing effect and to suppress the rising of temperature.Preferred solvent is an aliphatic hydrocarbon, aromatic hydrocarbons, and halohydrocarbon, aromatic halohydrocarbons, nitrile, ether, carboxylic acid and water, and can suitably therefrom select and use.When acid iodide or Periodic acid during as oxygenant, particularly preferred solvent is an acetate.Usually, the usage quantity of described solvent is 2-10 a times of substrate, but the usage quantity of solvent can drop on outside this scope.
In the preparation method of iodine compound of the present invention, raw material such as substrate, iodine and oxygenant and can once add for the zeolite catalyst of regular porous material to react.Described raw material such as substrate, iodine and oxygenant can be distinguished or add continuously.Usually, temperature of reaction is preferably 250 ℃ or lower, under liquid reactive situation preferred especially 80-200 ℃.Under the situation of gas-phase reaction preferred 200-400 ℃.After iodination reaction was finished, the separation that can use always and purification step such as filtration, solvent removal and crystallization were to obtain the pure products of expection.
In the present invention, when the 2-tolyl acid is prepared the high purity 5-iodo-2-tolyl acid that is used for medicine, electronic material, sense material etc. as substrate, by with described iodination reaction step with by adding entry or cooling off the step of precipitated product and combine by the purification step that water and organic solvent such as 2-propyl alcohol carry out recrystallization, can realize above-mentioned purpose effectively.
The raw material for preparing 5-iodo-2-tolyl acid---substrate 2-tolyl acid will there is no particular limitation for being used as, as long as it is industrial available, and in order to improve the purity of final product, the purity of this compound is preferably 98% or higher.
The preparation method of above-mentioned iodine compound as preparation high purity 5-iodo-2-tolyl acid the iodination reaction step, above-mentioned poromerics, particularly zeolite beta are preferably as described porous material.
In the iodination reaction of carrying out the 2-tolyl acid, after iodate in the presence of poromerics, also under the coexistence of acid iodide and/or Periodic acid, react.Described iodination reaction is only carried out with iodine, but owing to have the compound of electron-withdrawing group, lower as the reactive behavior of 2-tolyl acid, therefore, have to improve reactive behavior by the coexistence of acid iodide and/or Periodic acid.In addition, reactive behavior can be further be improved by suitable adding mineral acid such as sulfuric acid or nitric acid.
In above-mentioned iodination reaction step, any of iodine, acid iodide and Periodic acid at room temperature is solid, and they can be used for reaction with solid form former state, perhaps they can be dissolved or suspended in the appropriate solvent, use then.
When carrying out iodination reaction, can use various systems, as batch systems, semi-batch system, complete mixed flow system and fixed bed current system.Reaction system can be selected according to industrial scale.Under the small-scale production situation, batch systems is fit to, and when carrying out scale operation, reacting continuously with complete mixed flow system filling fixed bed current system is more effective preparation method.
The temperature of reaction of the iodination reaction of 2-tolyl acid in 50-200 ℃ of scope, preferred 70-150 ℃.In addition, when temperature was lower than above-mentioned scope, reaction was carried out, but can not obtain satisfied speed of reaction.When temperature was higher than above-mentioned scope, the generation of side reaction such as high boiling component increased, and is therefore, so not preferred.Reaction pressure (with absolute manometer) in the 0.05-20atm scope, preferred 0.1-10atm.
The fusing point of 2-tolyl acid is 105 ℃, when carrying out under being reflected at the temperature that is higher than this fusing point, needn't need reaction solvent.Usually, preferably use for iodate, to be organic solvent inert, (can) what use is acetate, trifluoroacetic acid, methylene dichloride, tetracol phenixin, dichlorobenzene and chlorobenzene.The consumption of solvent is preferably each weight part 2-tolyl acid 0.5-100 weight part, more preferably 1-50 weight part.
The consumption of iodine will there is no particular limitation in the iodination reaction of 2-tolyl acid, and in order to increase the transformation efficiency of 2-tolyl acid, it is 0.5 mole of every mole of 2-tolyl acid or more, preferred 1 mole or more.The consumption of acid iodide and/or Periodic acid is preferably every mole of iodine 0.01-1 mole, more preferably 0.05-0.5 mole.
The consumption of poromerics is per 1 weight part as 2-tolyl acid 0.05 weight part of substrate or more, preferred 0.1 weight part or more.If the consumption of poromerics is lower than above-mentioned scope, then can not get gratifying reactive behavior, can not optionally obtain 5-iodo-2-tolyl acid simultaneously.When poromerics is suspended when carrying out described reaction, the reaction mixture that obtains after the reaction can be easy to separate with poromerics by method in common such as sedimentation, centrifugation, filtration etc.The poromerics of separating can be recycled in the reaction system, and in this case, it can carry out necessary processing, as by removing the organic substance of attachment removal with appropriate solvent washing or circulating after the roasting in air.
After the iodination reaction of 2-tolyl acid, adding mineral acid such as sulfuric acid etc. in above-mentioned reaction system can further accelerated reaction speed.In this case, the add-on of mineral acid suitably is per 1 weight part 2-tolyl acid 0.005-0.05 weight part.If the add-on of mineral acid less than above-mentioned scope, then not too can obtain the acceleration effect of speed of reaction.When greater than above-mentioned scope, by product is easy to cause to the 5-iodo-2-tolyl acid of expection disadvantageous effect optionally, is not preferred therefore.
In the iodination reaction of carrying out the 2-tolyl acid, the reaction system of employing such as batch systems, semi-batch system and complete mixed flow system, the reaction times of adopting usually in batch systems and semi-batch system is 1-20 hour, this also is the residence time of adopting in complete mixed flow system, adopts usually 0.05-1 hour
-1LHSV (liquid air speed).
The preparation technology of high purity 5-iodo-2-tolyl acid of the present invention comprises above-mentioned iodination reaction step, wherein by adding entry or cool off crystal settling and the separating step that product is precipitated out, and subsequently the separation and the purification step that wherein with organic solvent isolated crystal are carried out recrystallization.Promptly, 5-iodo-2-tolyl acid can be separated as follows: add entry or reaction mixture is cooled off in reaction mixture reacting the back with described method, and by isolated crystal is carried out recrystallization and further carries out purification process, thereby can obtain highly purified 5-iodo-2-tolyl acid.
In the crystal recycling step, go out 5-iodo-2-tolyl acid by the water precipitation that adds the 1-10 weight part with respect to every weight part reaction mixture, and by filtering its recovery.When adding entry, iodine is precipitated out, and mixes with 5-iodo-2-tolyl acid in some cases, and this moment can be by in advance adding S-WAT or Sulfothiorine prevents that iodine is precipitated out in reaction mixture.The add-on of S-WAT or Sulfothiorine is that per 1 weight part is used for 0.05 part of the iodine of this reaction or still less it is enough.Except the method that adds entry, described crystalline reclaims and can realize under 90 ℃ or the lower temperature by reaction mixture is cooled to.After being cooled under 90 ℃ or the lower temperature, the crystal that is precipitated out by filtered and recycled.
The crystal that reclaims is by obtaining purifying with the organic solvent recrystallization.The organic solvent that is used for recrystallization can be any solvent, as long as it can dissolve 5-iodo-2-tolyl acid.What be fit to use is acetate, acetate-water mixed solvent, 2-propyl alcohol and 2-propyl alcohol-water mixed solvent.What the consumption of solvent was suitable is the crystal 1-30 weight part that per 1 weight part reclaims, preferred 5-20 weight part.Crystallization operation be crystal and solvent by the described recovery of heating under 40 ℃ or higher temperature, and its mixings is dissolved fully up to it, afterwards solution is cooled off to be settled out crystal.Cooling temperature is set in than crystal in heating and when mixing under low 20 ℃ or the more temperature of consoluet temperature.The crystal that is precipitated out obtains product then by filtered and recycled and dry.
The 5-iodo-2-tolyl acid that obtains by above-mentioned technology can have very high purity, and promptly purity is 99% or higher, and is 500ppm or lower with the total amount of iodine, iodine compound, inorganic salt and the transistion metal compound of impurity form in being included in.
In the preparation method of iodine compound of the present invention, iodine can be incorporated in the various substrates by highly selective, and under the situation of other substrates that are different from the 2-tolyl acid, can obtain containing the iodine compound of less impurity by operation much at one.
Next, will set forth in more detail the present invention by embodiment.But following embodiment will limit the present invention never in any form.
A. aromatic carboxylic acid's iodate
Embodiment 1:2-tolyl acid
In being housed, 200 milliliters of three-necked bottles of reflux condensing tube and agitator add acetate (100 gram), H-β zeolite (4.6 gram), iodine (20.2 grams, 0.16 mole), 2-tolyl acid (20 grams, 0.15 mole), Periodic acid dihydrate (7.3 grams, 0.03 mole) and sulfuric acid (0.24 gram), with their thorough mixing and stirring at room temperature.In heating jacket mixture temperature is elevated to 110 ℃, reaction was afterwards carried out 1 hour.Then, under the reflux temperature (about 118 ℃) of acetate, reaction was carried out 5 hours.
After reaction finishes, reaction mixture is filtered, reclaim H-β zeolite, in filtrate, add the sodium sulfite aqueous solution (100 milliliters) of 10 weight % to handle remaining iodine.Then, to wherein adding entry (800 gram) to be settled out crystal, then with its filtration and recovery.
Analyze crystal and the filtrate that obtains like this by HPLC (high pressure liquid chromatography), with the improvement of research performance, find that the transformation efficiency of 2-tolyl acid is 88%, product yield for 5-iodo-2-tolyl acid is 72%, is 6% for the product yield of 3-iodo-2-tolyl acid; The ratio of (5-iodine/3-iodine) regional isomer is 12.
Comparative Examples 1:2-tolyl acid: the situation of not using H-β zeolite
Implement the method identical with embodiment 1, difference is not use H-β zeolite therein.The transformation efficiency of 2-tolyl acid is 98%, is 66% for the product yield of 5-iodo-2-tolyl acid, is 25% for the product yield of 3-iodo-2-tolyl acid; The ratio of (5-iodine/3-iodine) regional isomer is 2.6.
Embodiment 2:3-tolyl acid
Implement the method identical with embodiment 1, difference is to use 3-tolyl acid (20 restrain 0.15 mole) as reactant therein.The transformation efficiency of 3-tolyl acid is 50%, for 6-iodo-3-tolyl acid 1) yield be 40%, for other iodide regional isomers 2) yield be 8%; 1) ratio/2) is 5.
Comparative Examples 2:3-tolyl acid: the situation of not using H-β zeolite
Implement the method identical with embodiment 2, difference is not use H-β zeolite therein.The transformation efficiency of 3-tolyl acid is 56%, for 6-iodo-3-tolyl acid 1) yield be 33%, for other iodide regional isomers 2) yield be 16%; 1) ratio/2) is 2.1.
Embodiment 3:2, the 4-mesitylenic acid
Implement the method identical with embodiment 1, difference is to use 2 therein, and 4-mesitylenic acid (22.5 restrain 0.15 mole) is as reactant.2, the transformation efficiency of 4-mesitylenic acid is 98%, for 5-iodo-2,4-mesitylenic acid 1) yield be 88%, for other iodide regional isomers 2) yield be 7%.1) ratio/2) is 12.6.
Comparative Examples 3:2,4-mesitylenic acid: the situation of not using H-β zeolite
Implement the method identical with embodiment 3, difference is not use H-β zeolite therein.2, the transformation efficiency of 4-mesitylenic acid is 96%, for 5-iodo-2,4-mesitylenic acid 1) yield be 81%, for other iodide regional isomers 2) yield be 8%; 1) ratio/2) is 10.
B. the iodate of aromatic hydrocarbons
Embodiment 4: toluene
Implement the method identical with embodiment 1, difference is to use toluene (13.8 restrain 0.15 mole) as reactant therein.The transformation efficiency of toluene is 98%, for 4-iodo-toluene 1) yield be 82%, for other iodide regional isomers 2) yield be 9%; 1) ratio/2) is 9.1.
Comparative Examples 4: toluene: the situation of not using H-β zeolite
Implement the method identical with embodiment 4, difference is not use H-β zeolite therein.The transformation efficiency of toluene is 100%, for 4-iodo-toluene 1) yield be 56%, for other iodide regional isomers 2) yield be 39%; 1) ratio/2) is 1.4.
Embodiment 5: o-Xylol
Implement the method identical with embodiment 1, difference is to use o-Xylol (15.9 restrain 0.15 mole) as reactant therein.The transformation efficiency of o-Xylol is 99%, for 4-iodo-1,2-dimethyl benzene 1) yield be 92%, for other iodide regional isomers 2) yield be 6%; 1) ratio/2) is 15.
Comparative Examples 5: o-Xylol: the situation of not using H-β zeolite
Implement the method identical with embodiment 5, difference is not use H-β zeolite therein.The transformation efficiency of o-Xylol is 100%, for 4-iodo-1,2-dimethyl benzene 1) yield be 78%, for other iodide regional isomers 2) yield be 16%; 1) ratio/2) is 4.9.
Embodiment 6: biphenyl
Implement the method identical with embodiment 1, difference is to use biphenyl (23.1 restrain 0.15 mole) as reactant therein.The transformation efficiency of biphenyl is 99%, for 4-iodo-biphenyl 1) yield be 92%, for other iodide regional isomers 2) yield be 5%; 1) ratio/2) is 18.4.
C. the iodate of halogenated aromatic hydrocarbons
Embodiment 7: fluorobenzene
Implement the method identical with embodiment 1, difference is to use fluorobenzene (14.4 restrain 0.15 mole) as reactant therein.The transformation efficiency of fluorobenzene is 65%, for 4-iodo-fluorobenzene 1) yield be 52%, for other iodide regional isomers 2) yield be 3%; 1) ratio/2) is 17.3.
Comparative Examples 6: fluorobenzene: the situation of not using H-β zeolite
Implement the method identical with embodiment 7, difference is not use H-β zeolite therein.The transformation efficiency of fluorobenzene is 63%, for 4-iodo-fluorobenzene 1) yield be 42%, for other iodide regional isomers 2) yield be 6%; 1) ratio/2) is 7.
D. the iodate of nitrile
Embodiment 8:2-methyl Benzyl cyanide
Implement the method identical with embodiment 1, difference is to use 2-methyl Benzyl cyanide (15.5 restrain 0.15 mole) as reactant therein.The transformation efficiency of 2-methyl Benzyl cyanide is 82%, for 5-iodo-2-methyl Benzyl cyanide 1) yield be 69%, for other iodide regional isomers 2) yield be 6%; 1) ratio/2) is 11.5.
Comparative Examples 7:2-methyl Benzyl cyanide: the situation of not using H-β zeolite
Implement the method identical with embodiment 8, difference is not use H-β zeolite therein.The transformation efficiency of 2-methyl Benzyl cyanide is 92%, for 5-iodo-2-methyl Benzyl cyanide 1) yield be 61%, for other iodide regional isomers 2) yield be 24%; 1) ratio/2) is 2.5.
E. be different from iodate under the oxygenant situation of Periodic acid in use
Embodiment 9: use the acid iodide oxidation
Implement the method identical with embodiment 1, difference is to use acid iodide (5.3 grams, 0.03 mole) replacement Periodic acid as oxygenant therein.The transformation efficiency of 2-tolyl acid is 78%, for 5-iodo-2-tolyl acid 1) yield be 69%, for other iodide regional isomers 2) yield be 3%; 1) ratio/2) is 23.
Comparative Examples 8: use the acid iodide oxidation: the situation of not using H-β zeolite
Implement the method identical with embodiment 9, difference is not use H-β zeolite therein.The transformation efficiency of 2-tolyl acid is 79%, for 5-iodo-2-tolyl acid 1) yield be 53%, for other iodide regional isomers 2) yield be 23%; 1) ratio/2) is 2.3.
Embodiment 10: use the Sodium Persulfate oxidation
Use the equipment identical, and add acetate (90 gram), water (10 gram), H-β zeolite (2.3 restrain) with embodiment 1, iodine (10.3 grams, 0.08 mole), 2-tolyl acid (10 grams, 0.074 mole), Sodium Persulfate (11.8 grams, 0.05 mole) and sulfuric acid (0.12 gram).At their thorough mixing and after at room temperature stirring, mixture temperature is elevated to 90 ℃, then reaction was carried out 5 hours.In addition, will be reflected under 110 ℃ and further carry out 8 hours, reaction afterwards finishes.By filtering to isolate H-β zeolite, remaining iodine is handled with the sodium sulfite aqueous solution of 10 weight %.Then, to wherein adding 800 ml waters, and the crystal that goes out of filtering-depositing.
The transformation efficiency of 2-tolyl acid is 86%, for 5-iodo-2-tolyl acid 1) yield be 64%, for 3-iodo-2-tolyl acid 2) yield be 12%; 1) ratio/2) is 5.3.
F. the iodate when use is different from the zeolite of H-β zeolite
Embodiment 11-14
Implement the method identical with embodiment 1, difference is mordenite, Y, L and the ZSM-5 replacement H-β zeolite that uses therein to porous material.When using corresponding zeolite, the ratio of (5-iodine/3-iodine) regional isomer is as follows.
Mordenite (embodiment 11) 5.0
Zeolite Y (embodiment 12) 4.8
Zeolite L (embodiment 13) 5.2
ZSM-5 (embodiment 14) 4.0
Under the situation of H-β zeolite (embodiment 1), the ratio of (5-iodine/3-iodine) regional isomer is 12, and when not using zeolite (Comparative Examples 1), described ratio is 2.6.Find that be different from use under the situation of H-β zeolite, selectivity is also very high.
The preparation of G. highly purified 5-iodo-2-tolyl acid
Embodiment 15
Implement the method identical with embodiment 1, difference is not use sulfuric acid therein; Acid iodide with 8.8 grams replaces Periodic acid; And be reflected under the reflux temperature (115 ℃) of acetate and carried out 3 hours, the result is as follows:
The transformation efficiency 70% of 2-tolyl acid
The yield 65% of 5-iodo-2-tolyl acid
The yield 2% of 3-iodo-2-tolyl acid
The ratio 33 of (5-iodine/3-iodine) regional isomer
5-iodo-2-tolyl acid crystalline purity 97%
By with above-mentioned purity being 97% 5-iodo-2-tolyl acid crystal water: the solvent recrystallization of 2-propyl alcohol=1: 1 (weight ratio) obtains purity and is 99% or higher 5-iodo-2-tolyl acid.
5-iodo-2-tolyl acid product behind the above-mentioned recrystallization comprises the free-iodine of 4ppm.This crystal is carried out the ICP full elemental analysis, found that, detection is less than Li, Na, K, Mg, Ca, Sr, Ba, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, W, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, In, Si, Sn, Pb, P, Sb and S, and the content of all periodictable the 1st families and the 2nd family's element all is 1ppm or following.
Embodiment 16
In being housed, 100 milliliters of three-necked bottles of reflux condensing tube add acetate 50 grams, 2-tolyl acid 10 grams, and iodine 10.4 restrains, Periodic acid 3.7 grams, H-β zeolite 2.2 grams and sulfuric acid 0.12 gram, and they were reacted 6 hours down at the reflux temperature (115 ℃) of acetate.After reaction finishes,, in filtrate, add sodium sulfite aqueous solution and 250 ml waters and the cool to room temperature of 20 grams, 10 weight % by filtering to isolate H-β zeolite.By the crystal that filtered and recycled is settled out, obtain 15 gram (dried weight) products.Crystal that analyze to reclaim by HPLC (high pressure liquid chromatography) and mother liquor are to estimate, and the result is as follows:
The transformation efficiency 85% of 2-tolyl acid
The yield 70% of 5-iodo-2-tolyl acid
The yield 7% of 3-iodo-2-tolyl acid
The ratio 10 of (5-iodine/3-iodine) regional isomer
5-iodo-2-tolyl acid crystalline purity 95%
Embodiment 17
With product 13 grams that the method identical with embodiment 16 obtains reclaiming, difference is with 4.3 gram acid iodide replacement Periodic acid.As analytical results, obtain following data:
The transformation efficiency 80% of 2-tolyl acid
The yield 72% of 5-iodo-2-tolyl acid
The yield 3% of 3-iodo-2-tolyl acid
The ratio 24 of (5-iodine/3-iodine) regional isomer
5-iodo-2-tolyl acid crystalline purity 95%
Embodiment 18: crystallisation by cooling
React under the condition identical with embodiment 16, difference is that the acetate amount that adds is 40 grams, and after separating H-β zeolite with the filtrate cool to room temperature.By the crystal that filtered and recycled is settled out, obtain 10 gram products.As analytical results, obtain following data:
The transformation efficiency 88% of 2-tolyl acid
The yield 72% of 5-iodo-2-tolyl acid
The yield 8% of 3-iodo-2-tolyl acid
The ratio 9 of (5-iodine/3-iodine) regional isomer
5-iodo-2-tolyl acid crystalline purity 95%
Comparative Examples 9: single iodine chloride (IC1 method)
In 100 milliliters of three-necked bottles that reflux condensing tube is housed, be suspended with sulfuric acid and 1.36 gram (10 mmole) 2-tolyl acids of 25 milliliter of 30 weight %, in 40 minutes, be dissolved in single iodine chlorides in the 5 gram acetate to wherein dripping 2.4 grams (15 mmole).Be reflected at 90 ℃ and carried out 5 hours, and with in reaction mixture impouring 90 ml waters.Filtering-depositing with the sodium sulfite aqueous solution washing, obtains crystalline solid product (output: 1.6 grams).This solid is analyzed, is found that this product has following distribution:
2-tolyl acid 33%
5-chloro-2-tolyl acid 13%
3-chloro-2-tolyl acid 9%
5-iodo-2-tolyl acid 38%
3-iodo-2-tolyl acid 5%
Other are 2% years old
Said mixture with acetate or Virahol recrystallization purifying, is attempted to isolate 5-iodo-2-tolyl acid.But the purity of mixture is not almost improved, and is difficult to obtain 5-iodo-2-tolyl acid.
Comparative Examples 10 (NaI-NaIO
4/ sulfuric acid process)
Using the equipment identical with embodiment 16 to restrain the 2-tolyl acids with 1.36 is dissolved in 9 milliliters of acetate.Mixture temperature remains on 85 ℃, in 25 minutes to wherein dripping 11 milliliters of vitriol oils.In addition, to wherein adding 0.6 gram sodium periodate, in 10 minutes, be dissolved in the solution that obtains in 5 milliliters of acetate then to wherein dripping by restraining sodium iodides to 1.1.Afterwards, reaction was carried out 2 hours, after the cooling, in reaction mixture impouring 90 ml waters, the muddy mixture that obtains was filtered.To wherein adding 1 gram S-WAT to remove unreacted iodine.After the drying, the above product that obtains is analyzed, is obtained following data:
2-tolyl acid 35%
5-iodo-2-tolyl acid 37%
3-iodo-2-tolyl acid 18%
Other are 5% years old
From said mixture, obtain 5-iodo-2-tolyl acid attempting to resemble among the embodiment 11, but almost not improvement of purity, and galloping to obtain 5-iodo-2-tolyl acid.
Comparative Examples 11 (not having zeolite)
React with the method identical with embodiment 16 and to obtain 15 gram products, difference is not use H-β zeolite.Analytical results is to obtain following data:
The transformation efficiency 85% of 2-tolyl acid
The yield 56% of 5-iodo-2-tolyl acid
The yield 20% of 3-iodo-2-tolyl acid
The ratio 2.8 of (5-iodine/3-iodine) regional isomer
5-iodo-2-tolyl acid crystalline purity 80%
Comparative Examples 12 (not having oxygenant)
React with the method identical with embodiment 16 and to obtain 0.8 gram product, difference is not use Periodic acid.Analytical results is to obtain following data:
The transformation efficiency 5% of 2-tolyl acid
The yield 3% of 5-iodo-2-tolyl acid
The yield 0.9% of 3-iodo-2-tolyl acid
The ratio 3.3 of (5-iodine/3-iodine) regional isomer
5-iodo-2-tolyl acid crystalline purity 75%
Embodiment 19: crystal purifying/water-IPA
The purity that embodiment 16 is obtained is that 95% 15 gram 5-iodo-2-tolyl acid crystal are dissolved in 210 gram water under 70 ℃: in the solvent of 2-propyl alcohol=1: 1 (weight ratio), solution is kept a night in room temperature.Restrain the crystal that is settled out by filtered and recycled to 10, and analyze, find that the purity of 5-iodo-2-tolyl acid is 99% with HPLC.
With the above purity that obtains be 99% 1 the gram crystal be dissolved in 25 ml methanol, to wherein adding 25 milliliter 4% the KI aqueous solution and 5 milliliter 17% sulfuric acid.Then, described solution is carried out titration, find, wherein contain the free-iodine of 5ppm with the sodium thiosulfate solution of 0.02M.According to the ICP full elemental analysis, do not detect Li, Na, K, Mg, Ca, Sr, Ba, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, W, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, In, Si, Sn, Pb, P, Sb and S, and the content of all periodictable the 1st families and the 2nd family's element all is 1ppm or following.
Embodiment 20: crystal purifying/acetate
The purity that embodiment 18 is obtained is that 95% 10 gram 5-iodo-2-tolyl acid crystal are dissolved under 70 ℃ in the 210 gram acetate, and solution is kept a night in room temperature.Restrain the crystal that is settled out by filtered and recycled to 6, and analyze, find that the purity of 5-iodo-2-tolyl acid is 99% with HPLC.
To the above purity that obtains is 99% 1 gram crystal, uses the method identical with embodiment 19 to analyze, and finds, wherein contains the free-iodine of 10ppm.According to the ICP full elemental analysis, do not detect Li, Na, K, Mg, Ca, Sr, Ba, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, W, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, In, Si, Sn, Pb, P, Sb and S, and the content of all periodictable the 1st families and the 2nd family's element all is 1ppm or following.
Industrial applicibility
The preparation method of iodine compound according to the present invention, iodine can be incorporated in the various substrates by highly selective. Because needn't use noble metal and special reagent, therefore, can carry out this reaction in commercial scale at an easy rate, and can obtain high purity product.
In addition, the present invention includes the technique of iodination reaction, separation and purification step so that can obtain highly purified 5-iodo-2-methyl benzoic acid with high yield at an easy rate, it can be used for functionalized chemical product such as medicine. The step that comprises iodination reaction, separation and purifying is characterised in that their processes are simple, and the purifying load is less, and is very beneficial in industrial enforcement.
Claims (11)
1. the preparation method of an iodine compound, wherein iodine and substrate the aperture be 500nm or following porous material in the presence of, or in the presence of above-mentioned porous material and oxygenant, react.
2. the preparation method of iodine compound as claimed in claim 1, wherein said porous material is that the aperture is the poromerics of 0.5-2nm.
3. the preparation method of iodine compound as claimed in claim 1, wherein said porous material is the zeolite beta that zeolite beta maybe can comprise the element that is different from the Si, the Al that form skeleton and O.
4. the preparation method of iodine compound as claimed in claim 1, wherein said porous material is the mesopore material that the aperture surpasses 2nm.
5. the preparation method of iodine compound as claimed in claim 1, wherein said oxygenant is at least a compound that is selected from the oxygen acid of being made up of acid iodide, Periodic acid, persulfuric acid, persulphate, nitric acid and molecular oxygen.
6. the preparation method of iodine compound as claimed in claim 1, wherein said substrate is by at least aly being selected from aromatic hydrocarbons, fused polycycle aromatic hydrocarbons, polycyclic aromatic hydrocarbons, containing by the compound of the heterocyclic hydrocarbon or derivatives thereof of following formula (1) expression and form:
R-Ar-X (1)
Wherein, R represents hydrogen atom, and halogen atom can have substituent alkyl, cycloalkyl or aryl; Ar represents aromatic monocyclic, encircles or fused rings more, or has the aromatic group of polynuclear plane or heterocyclic group; X represents hydrogen atom, halogen atom or be selected from the functional group of carboxyl, formyl radical, hydroxyl, nitro, methylol, cyano group, amino, alkoxyl group, alkoxy carbonyl, acyl group, acyloxy, alkyl sulphonyl and alkylsulfonyloxy; R and X can be identical or can exist a plurality of.
7. the preparation method of iodine compound as claimed in claim 6, wherein said substrate is made up of at least a compound that is selected from the following stated: benzene, fluorobenzene, chlorobenzene, bromobenzene, benzonitrile, phthalonitrile, Isophthalodinitrile, toluene, dimethylbenzene, isopropyl benzene, biphenyl, naphthalene, anthracene, methylnaphthalene, dimethylnaphthalene, tolyl acid, mesitylenic acid, diphenic acid, biphenyl dicarboxylic acid, naphthoic acid, and naphthalic acid.
8. the preparation method of iodine compound as claimed in claim 2, wherein iodine and 2-tolyl acid the aperture be the poromerics of 0.5-2nm and acid iodide and/or Periodic acid in the presence of react.
9. the preparation technology of high purity 5-iodo-2-tolyl acid, it is characterized in that comprising, carry out the step of iodination reaction by the described method of claim 8, wherein by adding entry or cool off and then separate crystal settling and the separating step that product is precipitated out, and the purification step that wherein with organic solvent isolated crystal is carried out recrystallization.
10. the preparation technology of high purity 5-iodo-2-tolyl acid as claimed in claim 9, the solvent that wherein is used for recrystallization is selected from any of acetate, acetate-water mixed solvent, 2-propyl alcohol and 2-propyl alcohol-water mixed solvent.
11. high purity 5-iodo-2-tolyl acid by prepared as claimed in claim 9, wherein said purity is 99% or higher, and the total amount of iodine, iodine compound, inorganic salt and transistion metal compound in being included in the impurity form is 500ppm or lower.
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| JP2003032187A JP4332702B2 (en) | 2003-02-10 | 2003-02-10 | Method for producing iodine compound |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103539662A (en) * | 2013-10-18 | 2014-01-29 | 雅本化学股份有限公司 | Preparation and recovery method of 2-methyl-5-iodobenzoic acid |
| CN104725185A (en) * | 2015-02-09 | 2015-06-24 | 许昌豪丰化学科技有限公司 | Preparation method of 4-iodobiphenyl |
| CN107652175A (en) * | 2017-08-08 | 2018-02-02 | 宁波人健化学制药有限公司 | A kind of synthetic method of the iodo-benzoic acid of 2 methyl 5 |
| CN110204433A (en) * | 2019-06-26 | 2019-09-06 | 湖南师范大学 | The synthetic method of the fluoro- 2- methyl benzoic acid of 3,4- of one kind bis- |
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| WO2006073124A1 (en) * | 2005-01-06 | 2006-07-13 | Nippoh Chemicals Co., Ltd. | Process for producing aromatic iodine compound |
| JP2008247746A (en) * | 2007-03-29 | 2008-10-16 | Mitsubishi Gas Chem Co Inc | Method for producing haloiodoaniline compounds |
| JP2009126784A (en) * | 2007-11-19 | 2009-06-11 | Mitsubishi Gas Chem Co Inc | Method for producing 2-iodo-3,4-dimethoxybenzonitrile |
| JP5940418B2 (en) * | 2012-09-14 | 2016-06-29 | マナック株式会社 | Method for producing 3-halogenated aniline |
| EP3059220B1 (en) | 2013-10-18 | 2018-12-05 | ABA Chemicals Corporation | Method of preparing and recovering 2-methyl-5-iodobenzoic acid |
| CN103980263B (en) * | 2014-04-17 | 2016-08-03 | 海门瑞一医药科技有限公司 | The synthesis technique of canagliflozin |
| CN105561918A (en) * | 2015-12-24 | 2016-05-11 | 启东复榆新材料科技有限公司 | Iodine-loaded nanopore material and iodine loading method |
| JP6861060B2 (en) * | 2017-03-17 | 2021-04-21 | 東レ・ファインケミカル株式会社 | Method for Producing 4,4'-Diiodot-3,3'-Dimethylbiphenyl |
| JP6739568B2 (en) * | 2018-07-05 | 2020-08-12 | 株式会社 東邦アーステック | Method for producing iodide ester compound |
| CN114349605A (en) * | 2022-02-15 | 2022-04-15 | 营口兴福化工有限公司 | P-iodophenol synthesis method |
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| US4746758A (en) * | 1986-09-29 | 1988-05-24 | Eastman Kodak Company | Processes for preparing iodinated aromatic compounds |
| US4778940A (en) * | 1987-03-25 | 1988-10-18 | Eastman Kodak Company | Process for preparing iodinated substituted aromatic compounds |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103539662A (en) * | 2013-10-18 | 2014-01-29 | 雅本化学股份有限公司 | Preparation and recovery method of 2-methyl-5-iodobenzoic acid |
| CN103539662B (en) * | 2013-10-18 | 2015-04-08 | 雅本化学股份有限公司 | Preparation and recovery method of 2-methyl-5-iodobenzoic acid |
| CN104725185A (en) * | 2015-02-09 | 2015-06-24 | 许昌豪丰化学科技有限公司 | Preparation method of 4-iodobiphenyl |
| CN107652175A (en) * | 2017-08-08 | 2018-02-02 | 宁波人健化学制药有限公司 | A kind of synthetic method of the iodo-benzoic acid of 2 methyl 5 |
| CN110204433A (en) * | 2019-06-26 | 2019-09-06 | 湖南师范大学 | The synthetic method of the fluoro- 2- methyl benzoic acid of 3,4- of one kind bis- |
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| JP2004262769A (en) | 2004-09-24 |
| JP4332702B2 (en) | 2009-09-16 |
| CN101362681A (en) | 2009-02-11 |
| CN100436385C (en) | 2008-11-26 |
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