3-Methylpyridine

Heterocyclic products are generally good; I’m not very familiar with this specific one! ! !

This variety holds great promise. In China, most 3-methylpyridine is imported, and most of the 3-methylpyridine produced in Nantong is exported. It seems that Hongtaiyang also supplies only a limited number of customers, so if you engage in this business, it has great potential! ! This is all the information I can provide; I’m sorry

From what everyone is saying, it seems like the customer base is quite small. Could you provide more details?

This product has a wide range of uses. It can be used as a solvent, and many pharmaceutical and pesticide intermediates can also be derived from it.

The main use of 3-methylpyridine is in the production of nicotinic acid and nicotinamide (vitamin B3); its usage in other areas is not significant at present. Currently, vitamin B3 is produced in a monopoly by a few companies such as Lonza, which all have exclusive distribution channels. 3-Methylpyridine is mainly produced alongside pyridine (which requires significant capital and technical resources). In previous years, due to high market demand, Lonza as well as some domestic manufacturers also used nylon by-products to produce 3-methylpyridine (this practice has now been completely discontinued). Currently, the 3-methylpyridine market is in a state of weak equilibrium to oversupply, making it highly risky for newcomers to enter the market. The domestic manufacturer is Red Sun; through eight to nine years of optimization and improvement, the company has strong competitiveness. I hope this is helpful to you.

In China, pyridine and 3-methylpyridine are generally produced together, with the ratio of raw materials adjusted according to demand to obtain products with different proportions! Pyridine is a product with great potential; I’m keeping an eye on it! :handshake

3-Methylpyridine, also known as β-methylpyridine or 3-picoline, is an important pyridine derivative. Through a series of reactions, various important fine organic synthesis intermediates can be synthesized, which are widely used in fields such as pesticides and pharmaceuticals. 1 Synthesis of 3-methylpyridine 3-Methylpyridine was previously obtained by recovering it from the by-products of coal coking, but due to the high content of pyridine compounds in these by-products and the difficulties associated with separation, synthetic methods are now widely used for its production. 3-Methylpyridine is mainly synthesized through the following methods: 1.1 The acraldehyde method – Using Al2O3/SiO2 treated with ammonia fluoride as a catalyst, acraldehyde and ammonia react in a fluidized bed to produce 3-methylpyridine. Its yield is over 75%. During this reaction process, to prevent the autopolymerization of acraldehyde, a propylene oxide inhibitor can be appropriately added. 1.2 Alcohol-aldehyde method: In the presence of a Pb-ZSM-5 catalyst, 3-methylpyridine is produced via a gas-solid phase contact catalytic reaction at 420°C using ethanol, formaldehyde, and ammonia. But the yield was only 29.9%. 1.3 Aldehyde-ammonia method: 3-methylpyridine is produced by the reaction of acetaldehyde, formaldehyde, and ammonia in a sulfurized bed reactor under the action of HZSM-5 catalysts. Its yield can reach 50%. 1.4 Aldehyde-amine method: Under the catalysis of diammonium hydrogen phosphate, triacetaldehyde and hexamethylenetetramine react to produce 3-methylpyridine. The yield was 65.5%. 1.5 Acraldehyde-propanal-ammonia method: Under the catalysis of a catalyst containing aluminum hydroxide, cadmium hydroxide, and silica gel, acraldehyde and propanal are vaporized and react with ammonia to produce 3-methylpyridine. The yield was 57%. 1.6 Triallylamine method: A zinc oxide catalyst supported on silica or alumina is added to the reactor, along with triallylamine and nitrogen. They are obtained through a reaction between the two. The yield was 74%. 1.7 2-Methylpentanediamine method: γ-Al2O3 is placed in a reaction bed; hydrogen is used as the carrier gas, and the material is activated by heating at 400°C. 2-Methylpentanediamine is introduced into the system, and the temperature is raised to 450°C to initiate the reaction. The yield was 7.07%. Additionally, there is the 2-methylglutaronitrile method. Using Pd/γ-Al2O3 as a catalyst, 2-methylglutaronitrile cyclizes with hydrogen to form 2-methylpiperidone, which is then dehydrogenated to yield 3-methylpyridine. 2 Applications of 3-methylpyridine 2.1 Applications in the pesticide sector In the pesticide industry, 3-methylpyridine can be used as an intermediate for synthesizing pesticides such as herbicides, insecticides, and fungicides. For example: 2.1.1 2-Chloro-5-chloromethylpyridine – 3-Methylpyridine is first oxidized to 3-methylpyridinonitrogen, and then chlorinated using phosphorus trichloride in the presence of a solvent, catalyst, and acid scavenger to yield 2-chloro-5-methylpyridine. Finally, this compound is chlorinated with chlorine in the presence of a catalyst and solvent to produce 2-chloro-5-chloromethylpyridine. The pesticide products synthesized from this starting material include: ① Imidacloprid. Imidacloprid was developed by Bayer in Germany and by a Japanese company specializing in pesticides; it belongs to the class of nitroimine-based, highly systemic and ultra-effective insecticides, and it exhibits excellent efficacy against leafhoppers, planthoppers, and aphids. It is obtained by the condensation of 2-chloro-5-chloromethylpyridine with imidazoline in the presence of a solvent and a catalyst. ②Acetamiprid is a chlorinated nicotine insecticide developed by Nippon Soda Co., Ltd. It exerts contact and stomach toxicity on pests, and possesses excellent systemic activity; it is an efficient, broad-spectrum, safe insecticide with a novel mode of action. It is effective against Hemiptera, Lepidoptera, Coleoptera, and Thysanoptera. It is highly effective against pests that have developed severe resistance to existing organophosphates and carbamates. It is a new insecticide variety with great market potential. It is obtained by first reacting 2-chloro-5-oxymethylpyridine with methylamine under solvent conditions to form N-(2-chloro-5-pyridylmethyl)methanamine, and then by condensation with ethyl N-cyanoetheniminate followed by dehydration. 2.1.2 2-Chloro-3-methylpyridine: 2-Chloro-3-methylpyridine is an isomer that is produced simultaneously during the synthesis of 2-chloro-5-methylpyridine; its yield is approximately 1/5 of that of the main product. By crystallization, it can be separated from the main product to yield crude 2-chloro-3-methylpyridine, which can then be refined to obtain a product with a purity of around 95%. The pesticide products synthesized using 2-chloro-3-methylpyridine as the starting material include: ① Pyrifluzifol. Pyrifluzifol is a broad-spectrum, selective herbicide of the amide type that was developed in 1982 by the French company Roussel Uclaf; when applied before or after germination in wheat and barley fields, it effectively controls both grassy and broadleaf weeds. Its synthesis involves first oxidizing 2-chloro-3-methylpyridine to 2-chloro-3-pyridinecarboxylic acid, then condensing it with 3-fluoro**phenol to obtain 2-(3-trifluorooxy)-3-pyridinecarboxylic acid, and finally reacting it with 2,4-difluoroaniline to yield pyrifluzin. ②Nicosulfuron is a sulfonylurea-based herbicide for corn fields developed by the Japanese company Ishihara Kogyo; it is effective in controlling grassy weeds as well as certain broadleaf weeds. It is obtained by first converting 2-chloro-3-methylpyridine into 2-chloronicotinic acid, then proceeding through amidation, sulfonation, and amination to yield 2-aminosulfonyl-N,N-dimethylpyridine amide; this compound is subsequently reacted with ethyl chloroformate, and finally reacted with 2-amino-4,6-dimethoxypyrimidine. ③Flazasulfuron is a sulfonylurea herbicide developed by the Japanese company Ishihara Kogyo. Its synthesis method is similar to that of nicosulfuron, with the difference being that flazasulfuron is synthesized using 2-chloro-3-trifluoromethylpyridine as the starting material. In this synthesis process, 2-chloro-3-methylpyridine is chlorinated at high temperatures to produce 2-chloro-3-trichloromethylpyridine, which is then fluorinated under high-temperature catalysis to yield the desired compound. It can effectively control most lawn weeds such as zoysia and foxtail grass, and is particularly effective against Stenotaphrum secundatum and Cyperus. 2.1.3 2-Chloro-5-trifluoromethylpyridine: 2-Chloro-5-methylpyridine is subjected to high-temperature chlorination using chlorine gas in the presence of a catalyst to yield 2-chloro-5-trichloromethylpyridine; thereafter, high-temperature fluorination with hydrogen fluoride under catalytic conditions produces the final product. 2-Chloro-5-trifluoromethylpyridine is a key intermediate in the synthesis of pyflufenox. First, 2-chloro-5-trifluoromethylpyridine reacts with hydroquinone in an alkaline medium to yield the corresponding ether, which is then reacted with butyl 2-chloropropionate to produce the product pyrifluzin. Pifluzuron is a phenoxycarboxylic acid herbicide developed by Ishihara Sangyo Company and GlaxoSmithKline in the UK. It is a selective post-emergence herbicide used to control barnyard grasses, primarily applied to broadleaf crops such as soybeans, beets, cotton, and peanuts. 2.1.4 2,3-Dichloro-5-trifluoromethylpyridine: The target compound can be obtained by passing chlorine gas over 2-chloro-5-trifluoromethylpyridine in the presence of a catalyst, with temperature controlled to facilitate further cyclochlorination. The pesticides synthesized from 2,3-dichloro-5-trifluoromethylpyridine mainly include: ① Imidacloprid. Imidacloprid is a benzoylurea insecticide developed by Ishihara Sangyo Company; it is effective in controlling pests such as Lepidoptera, Orthoptera, Coleoptera, Odonata, and Diptera in cotton, soybeans, corn, fruit trees, vegetables, tea plants, forestry, and public health sectors. First, 2,3-dichloro-5-trifluoromethylpyridine is reacted with 2,6-dichloro-4-aminophenol in dimethyl sulfoxide to produce an aniline derivative, which is then reacted with 2,6-difluorobenzoyl isocyanate to yield the final product. ②Imidacloprid is a urea-based insecticide developed by the Swiss company Novartis. Its properties, uses, and synthesis method are very similar to those of acetamiprid. Currently, it is used in large quantities abroad for the control of animal pests. First, 2,3-dichloro-5-trifluoromethylpyridine is reacted with 2-chloro-5-aminophenol in dimethyl sulfoxide to produce an aniline derivative, which is then reacted with 2,6-difluorobenzoyl isocyanate to yield the final product. ③Fludioxonil is a pyridine amine-based fungicide developed by Ishihara Sangyo Company and further improved by Teijin Corporation. As a protective fungicide, it is highly effective against species of the genera Alternaria, Botrytis, Phytophthora, Monilinia, Pythium, and Rhizoctonia. It is resistant to rain wash, has a long duration of effectiveness, and also offers excellent control over phytophagous mites, making it a truly outstanding variety. It is prepared by reacting 2,3-dichloro-5-trifluoromethylpyridine with 2,6-dichloro-4-trifluoromethyl-5-chloroaniline at room temperature in a mixture of potassium hydroxide and **furan. ④Piflufenozide is a phenoxycarboxylic acid herbicide developed by the American company Dow AgroSciences. It is suitable for use in broadleaf crop fields such as cotton, peanuts, soybeans, and beets. It can effectively control annual or perennial grassy weeds. The product is obtained by heating 2-(4-hydroxyphenoxy)propanoic acid together with sodium hydroxide in dimethyl sulfoxide, and then reacting it with 2,3-dichloro-5-trifluoromethylpyridine at 105–110°C. 2.2 Applications in the pharmaceutical field In the pharmaceutical industry, 3-methylpyridine is primarily used in the synthesis of nicotinic acid. Niacin, also known as 3-pyridinecarboxylic acid, is the simplest in structure and the most stable in terms of physical and chemical properties among vitamins. It is an essential component for oxygen transport in humans and animals; it participates in the redox processes within tissues, has the ability to promote cellular metabolism and blood vessel dilation, and contributes to the growth and development of humans and animals. Niacin promotes iron absorption and blood cell production, maintains normal skin function and the secretion of digestive glands, and enhances the excitability of the central nervous system as well as the functions of the cardiovascular system, reticuloendothelial system, and secretory systems. Niacin is obtained by oxidizing 3-methylpyridine using potassium permanganate. 2.3 Applications in Other Fields In addition to its uses in the aforementioned fields, 3-methylpyridine can be used to synthesize a variety of derivative products. These products are mostly high-value, specialty fine chemical intermediates, and can also be used in the synthesis of fragrances, dyes, and consumer goods. In summary, there are various methods for synthesizing 3-methylpyridine. Currently, on an industrial scale, it is mainly produced by reacting organic compounds such as aldehydes and ammonia in the presence of catalysts, but its yield is relatively low. Developing and selecting emerging catalysts to improve product yield is key to corporate growth. 3-Methylpyridine is mainly used in pesticides and is less utilized in other fields. How to develop the applications of 3-methylpyridine in other fields is the direction of our future efforts.

1. Acetamiprid – Imidacloprid 2. Amistar – Amistad 3. Chlorfenapyr – Bromfenacryl 4. Clodinafop-Propargyl – Clodinafop 5. Diflubenzuron – Diflubenzuron 6. Fenpyro*mate – Fenpyrothrin 7. Fipronil – Fluorfenicol 8. Flufenoxuron – Flufenoxuron 9. Flurochloridon – Fluroxypyr 10. Imidacloprid – Imidacloprid 11. Indoxacarb – Indoxacarb 12. Mesotrion – Metsulfuron-methyl 13. Metaflumizone – Metaflumizone 14. Rimsulfuron – Rimsulfuron 15. Spirodiclofen – Spirodiclofen 16. Thiamethoxam – Thiamethoxam 17. Triflumuron – Triflumuron www.dongshengchem.com.cn dongshengchem@126.com MSN: dongshengchem@hotmail.com

There are introductions in other sections of the forum: http://bbs.hcbbs.com/viewthread.php?tid=364485, which can be referred to.