Pyridine compound

Pyridine compound is one of the most widely developed and used heterocyclic compound. As an important fine chemical raw material, its derivatives mainly include alkyl pyridine, halogenated pyridine, aminopyridine, bromo pyridine, picoline , iodine pyridine, chloropyridine, nitropyridine-hydroxypyridine, benzyl pyridine, ethyl pyridine, pyridine cyano, fluoro pyridine, dihydropyridine, etc., in which the pesticide accounts for about 50% of the total consumption of pyridine products, feed additive about 30% and  medicine and other areas 20%.

Pyridine is a colorless or slightly yellow liquid that has weak alkaline and special odor. It is an important chemical raw material and solvent, which naturally presents in coal tar, shale oil, gas and petroleum and is miscible with most of the water, alcohols, ethers, petroleum ether, oils, benzene, chloroform and other organic solvents.

The important derivatives of pyridine mainly include nicotinic acid, nicotinamide, isonicotinic hydrazide, nicotine, strychnine, and vitamin B6.

Pyridine has a close hexagonal structure that is similar to benzene. Because of the electron-withdrawing effect of the nitrogen atom in the ring, the electron density of 2,4,6 positions is less than that of 3,5 positions. In an acidic medium, electrophilic substitution reactions occur in the 3,5 positions and nucleophilic reactions, such as amination, alkylation, arylation, acylation, occur in the 2,4,6 positions. Pyridine is a weak tertiary amine, which can form different water-soluble salts with various acids (such as picric acid, perchloric acid or the like) in an ethanol solution. Due to the alkaline of pyridine, it can generate hydrochloride (C5H5N•HCl)with hydrochloric acid. In the effect of nickel catalyst at 200 ℃ and 15-30MPa, it can generate piperidine via hydrogenation or electrolysis reduction. The reduction of pyridine is easier than benzene, while the oxidation is more difficult than benzene. But we can oxidize pyridine by the catalysis of hydrogen peroxide or peroxy acids. N-pyridine oxide is an important pyridine derivative, which is easier for the happen of aryl group electrophilic substitution reaction because the oxidation of nitrogen atoms make the formation of positively charged pyridinium cation impossible. Electrophilic substitutions, such as pyridine nitration, sulfonation, halogenation, are relatively difficult, but the previous actions are slightly easier than halogenation. We can obtain 3,5-dichloro-pyridine or 3,4,5-trichloro pyridine via pyridine nitration and sulfonation at more than 200℃. Pyridine can form many crystalline complex compounds with various metal ions.

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Structure Chemical Name CAS MF
2-AMINO-5-CHLORO-3-NITROPYRIDINE 2-AMINO-5-CHLORO-3-NITROPYRIDINE 409-39-2 C5H4ClN3O2
2-Fluoro-4-iodo-5-picoline 2-Fluoro-4-iodo-5-picoline 153034-94-7 C6H5FIN
3,5,6-Trichloro-2-pyridinol 3,5,6-Trichloro-2-pyridinol 6515-38-4 C5H2Cl3NO
2-Bromo-6-methylpyridine 2-Bromo-6-methylpyridine 5315-25-3 C6H6BrN
2-AMINO-5-METHYLPYRIDINE 2-AMINO-5-METHYLPYRIDINE 2454-96-8 C6H9ClN2
2-Amino-6-(trifluoromethyl)pyridine 2-Amino-6-(trifluoromethyl)pyridine 34486-24-3 C6H5F3N2
2,4-Dichloro-3-nitropyridine 2,4-Dichloro-3-nitropyridine 5975-12-2 C5H2Cl2N2O2
2-Cyano-5-fluoropyridine 2-Cyano-5-fluoropyridine 327056-62-2 C6H3FN2
Ethyl 4,6-dichloronicotinate Ethyl 4,6-dichloronicotinate 40296-46-6 C8H7Cl2NO2
2,3,6-Trichloropyridine 2,3,6-Trichloropyridine 29154-14-1 C5H2Cl3N
4-Bromo-2-methoxypyridine 4-Bromo-2-methoxypyridine 100367-39-3 C6H6BrNO
2-Bromo-4-pyridinecarboxaldehyde 2-Bromo-4-pyridinecarboxaldehyde 118289-17-1 C6H4BrNO
3-CHLORO-2-HYDROXY-5-(TRIFLUOROMETHYL)PYRIDINE 3-CHLORO-2-HYDROXY-5-(TRIFLUOROMETHYL)PYRIDINE 76041-71-9 C6H3ClF3NO
3-(Trifluoromethyl)pyridine-2-carboxylic acid 3-(Trifluoromethyl)pyridine-2-carboxylic acid 87407-12-3 C7H4F3NO2
2-Amino-3-bromo-5-fluoropyridine 2-Amino-3-bromo-5-fluoropyridine 869557-43-7 C5H4BrFN2
2-Chloro-4-fluoropyridine 2-Chloro-4-fluoropyridine 34941-91-8 C5H3ClFN
2-(Chloromethyl)pyridine hydrochloride 2-(Chloromethyl)pyridine hydrochloride 6959-47-3 C6H7Cl2N
3-BROMO-2-NITROPYRIDINE 3-BROMO-2-NITROPYRIDINE 54231-33-3 C5H3BrN2O2
2-HYDROXY-5-FORMYLPYRIDINE 2-HYDROXY-5-FORMYLPYRIDINE 106984-91-2 C6H5NO2
3-BROMOPYRIDINE-N-OXIDE 3-BROMOPYRIDINE-N-OXIDE 2402-97-3 C5H4BrNO
3-Aminopyridine 3-Aminopyridine 462-08-8 C5H6N2
5-CHLORO-2-IODOPYRIDINE 5-CHLORO-2-IODOPYRIDINE 244221-57-6 C5H3ClIN
2,2'-Dithiodipyridine 2,2'-Dithiodipyridine 2127-03-9 C10H8N2S2
3-Amino-6-chloro-2-picoline 3-Amino-6-chloro-2-picoline 164666-68-6 C6H7ClN2
3-Pyridinol N-oxide 3-Pyridinol N-oxide 6602-28-4 C5H5NO2
3-Amino-5-hydroxypyridine 3-Amino-5-hydroxypyridine 3543-01-9 C5H6N2O
5-ETHYLPYRIDINE-2,3-DICARBOXYLIC ACID 5-ETHYLPYRIDINE-2,3-DICARBOXYLIC ACID 102268-15-5 C9H9NO4
2-Fluoro-3-iodopyridine 2-Fluoro-3-iodopyridine 113975-22-7 C5H3FIN
4-Chloropyridine N-oxide 4-Chloropyridine N-oxide 1121-76-2 C5H4ClNO
3-Amino-2-chloro-4-methylpyridine 3-Amino-2-chloro-4-methylpyridine 133627-45-9 C6H7ClN2
3-BROMO-2-CHLORO-5-FLUOROPYRIDINE 3-BROMO-2-CHLORO-5-FLUOROPYRIDINE 884494-36-4 C5H2BrClFN
2-BROMO-3-FLUORO-6-PICOLINE 2-BROMO-3-FLUORO-6-PICOLINE 374633-36-0 C6H5BrFN
2,3-Pyridinedicarboxylic anhydride 2,3-Pyridinedicarboxylic anhydride 699-98-9 C7H3NO3
Ethyl 6-bromopicolinate Ethyl 6-bromopicolinate 21190-88-5 C8H8BrNO2
6-BROMOPYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 6-BROMOPYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 26218-75-7 C7H6BrNO2
3-HYDROXY-4-PYRIDINECARBOXYLIC ACID 3-HYDROXY-4-PYRIDINECARBOXYLIC ACID 10128-71-9 C6H5NO3
2,6-Dichloro-3-iodopyridine 2,6-Dichloro-3-iodopyridine 148493-37-2 C5H2Cl2IN
3-HYDROXY-6-METHYL-2-NITROPYRIDINE 3-HYDROXY-6-METHYL-2-NITROPYRIDINE 15128-90-2 C6H6N2O3
(3-CHLORO-PYRIDIN-2-YL)-HYDRAZINE (3-CHLORO-PYRIDIN-2-YL)-HYDRAZINE 22841-92-5 C5H6ClN3
2-Methoxy-4-pyridinecarboxylic acid 2-Methoxy-4-pyridinecarboxylic acid 105596-63-2 C7H7NO3
7-Bromopyrido[2,3-b]pyrazine 7-Bromopyrido[2,3-b]pyrazine 52333-42-3 C7H4BrN3
4-Amino-2-bromopyridine 4-Amino-2-bromopyridine 7598-35-8 C5H5BrN2
3,4-Dichloropyridine 3,4-Dichloropyridine 55934-00-4 C5H3Cl2N
4-Fluoropyridine 4-Fluoropyridine 694-52-0 C5H4FN
6-CHLORONICOTINOYL CHLORIDE 6-CHLORONICOTINOYL CHLORIDE 58757-38-3 C6H3Cl2NO
Pentachloropyridine Pentachloropyridine 2176-62-7 C5Cl5N
Tetrachloropyridine-2-carboxylic acid Tetrachloropyridine-2-carboxylic acid 10469-09-7 C6HCl4NO2
5-BROMONICOTINOYL CHLORIDE 5-BROMONICOTINOYL CHLORIDE 39620-02-5 C6H3BrClNO
Gimeracil Gimeracil 103766-25-2 C5H4ClNO2
4-Chloro-3-nitropyridine hydrochloride 4-Chloro-3-nitropyridine hydrochloride 54079-68-4 C5H4Cl2N2O2
2-Fluoro-3-hydroxypyridine 2-Fluoro-3-hydroxypyridine 174669-74-0 C5H4FNO
3-Fluoropyridine-4-carboxylic acid 3-Fluoropyridine-4-carboxylic acid 393-53-3 C6H4FNO2
4,6-Dichloronicotinic acid 4,6-Dichloronicotinic acid 73027-79-9 C6H3Cl2NO2
2-Fluoro-3-methyl-5-aminopyridine 2-Fluoro-3-methyl-5-aminopyridine 186593-48-6 C6H7FN2
2-BROMO-3-METHOXYPYRIDINE 2-BROMO-3-METHOXYPYRIDINE 24100-18-3 C6H6BrNO
2,2'-DIPICOLYLAMINE 2,2'-DIPICOLYLAMINE 1539-42-0 C12H13N3
2-Bromopyridine-4-methanol 2-Bromopyridine-4-methanol 118289-16-0 C6H6BrNO
2-Fluoro-4-methylpyridine 2-Fluoro-4-methylpyridine 461-87-0 C6H6FN
2-Mercaptonicotinic acid 2-Mercaptonicotinic acid 38521-46-9 C6H5NO2S
3-Chloro-5-(trifluoromethyl)pyridine 3-Chloro-5-(trifluoromethyl)pyridine 85148-26-1 C6H3ClF3N
2-Amino-6-bromopyridine 2-Amino-6-bromopyridine 19798-81-3 C5H5BrN2
5-(Trifluoromethyl)pyridine-2-carboxylic acid 5-(Trifluoromethyl)pyridine-2-carboxylic acid 80194-69-0 C7H4F3NO2
3-BROMO-4-FLUOROPYRIDINE 3-BROMO-4-FLUOROPYRIDINE 116922-60-2 C5H3BrFN
2-Amino-5-nitropyridine 2-Amino-5-nitropyridine 4214-76-0 C5H5N3O2
5-Bromo-2-fluoro-3-pyridylboronic acid 5-Bromo-2-fluoro-3-pyridylboronic acid 501435-91-2 C5H4BBrFNO2
1-TRIFLUOROMETHYLCYCLOBUTANE-1-CARBOXYLIC ACID 1-TRIFLUOROMETHYLCYCLOBUTANE-1-CARBOXYLIC ACID 277756-45-3 C6H7F3O2
2,3,5,6-Tetrachloropyridine 2,3,5,6-Tetrachloropyridine 2402-79-1 C5HCl4N
2-Bromo-6-(trifluoromethyl)pyridine 2-Bromo-6-(trifluoromethyl)pyridine 189278-27-1 C6H3BrF3N
5-CHLORO-2 3-PYRIDINEDIOL  95 5-CHLORO-2 3-PYRIDINEDIOL 95 53233-89-9 C5H4ClNO2
3-AMINO-6-METHOXY-2-PICOLINE HCL 3-AMINO-6-METHOXY-2-PICOLINE HCL 320577-63-7 C7H11ClN2O
3-CYANO-5-METHYLPYRIDINE 3-CYANO-5-METHYLPYRIDINE 42885-14-3 C7H6N2
2-ETHYL-3-HYDROXY-6-METHYLPYRIDINE 2-ETHYL-3-HYDROXY-6-METHYLPYRIDINE 2364-75-2 C8H11NO
2-METHOXY-5-NITRO-6-PICOLINE 2-METHOXY-5-NITRO-6-PICOLINE 5467-69-6 C7H8N2O3
1-FLUOROPYRIDINIUM TETRAFLUOROBORATE 1-FLUOROPYRIDINIUM TETRAFLUOROBORATE 107264-09-5 C5H5BF5N
2-(4-Chlorobenzyl)pyridine 2-(4-Chlorobenzyl)pyridine 4350-41-8 C12H10ClN
3-Iodopyridin-2-amine 3-Iodopyridin-2-amine 104830-06-0 C5H5IN2
3-Chloro-5-fluoropyridine 3-Chloro-5-fluoropyridine 514797-99-0 C5H3ClFN
4-Pyrrolidinopyridine 4-Pyrrolidinopyridine 2456-81-7 C9H12N2
3-AMINO-ISONICOTINIC ACID ETHYL ESTER 3-AMINO-ISONICOTINIC ACID ETHYL ESTER 14208-83-4 C8H10N2O2
3-Bromo-2-hydroxypyridine 3-Bromo-2-hydroxypyridine 13466-43-8 C5H4BrNO
2-Hydroxy-5-nitronicotinic acid 2-Hydroxy-5-nitronicotinic acid 6854-07-5 C6H4N2O5
3,5-Difluoropyridine 3,5-Difluoropyridine 71902-33-5 C5H3F2N
5-BROMO-2-FLUORO-6-PICOLINE 5-BROMO-2-FLUORO-6-PICOLINE 375368-83-5 C6H5BrFN
Methyl 2-methylnicotinate Methyl 2-methylnicotinate 65719-09-7 C8H9NO2
4-BROMOPYRIDINE-2-CARBALDEHYDE 4-BROMOPYRIDINE-2-CARBALDEHYDE 131747-63-2 C6H4BrNO
2,3 DIBROMO-5-CHLORO PYRIDINE 2,3 DIBROMO-5-CHLORO PYRIDINE 137628-17-2 C5H2Br2ClN
2-Chloro-1-methylpyridinium iodide 2-Chloro-1-methylpyridinium iodide 14338-32-0 C6H7ClIN
2-BROMO-ISONICOTINIC ACID METHYL ESTER 2-BROMO-ISONICOTINIC ACID METHYL ESTER 26156-48-9 C7H6BrNO2
2-HYDROXY-3,5-DINITROPYRIDINE 2-HYDROXY-3,5-DINITROPYRIDINE 2980-33-8 C5H3N3O5
2-Hydroxy-5-methylpyridine 2-Hydroxy-5-methylpyridine 1003-68-5 C6H7NO
2-Amino-3-(trifluoromethyl)pyridine 2-Amino-3-(trifluoromethyl)pyridine 183610-70-0 C6H5F3N2
2-Amino-5-chloro-3-fluoropyridine 2-Amino-5-chloro-3-fluoropyridine 246847-98-3 C5H4ClFN2
2,5-DICHLOROPYRIDINE-4-BORONIC ACID 2,5-DICHLOROPYRIDINE-4-BORONIC ACID 847664-64-6 C5H4BCl2NO2
2-Methyl-5-nitropyridine 2-Methyl-5-nitropyridine 21203-68-9 C6H6N2O2
4-CHLORO-3-FLUOROPYRIDINE HCL 4-CHLORO-3-FLUOROPYRIDINE HCL 119229-74-2 C5H4Cl2FN
2-(METHOXYMETHYL)PYRIDINE 2-(METHOXYMETHYL)PYRIDINE 23579-92-2 C7H9NO
5-Amino-2-bromo-6-picoline 5-Amino-2-bromo-6-picoline 126325-47-1 C6H7BrN2
4-BROMO-3-HYDROXYPYRIDINE 4-BROMO-3-HYDROXYPYRIDINE 161417-28-3 C5H4BrNO
5-FLUORO-2-METHOXYNICOTINALDEHYDE 5-FLUORO-2-METHOXYNICOTINALDEHYDE 351410-62-3 C7H6FNO2
2,4-Dichloropyridine 2,4-Dichloropyridine 26452-80-2 C5H3Cl2N
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