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-Fluoro-5-trifluoromethylpyridine 2-Fluoro-5-trifluoromethylpyridine 69045-82-5 C6H3F4N
2-Bromo-4-nitropyridine 2-Bromo-4-nitropyridine 6945-67-1 C5H3BrN2O2
2-Chloro-4-methyl-3-nitropyridine 2-Chloro-4-methyl-3-nitropyridine 23056-39-5 C6H5ClN2O2
2,6-DIMETHOXY-3-NITROPYRIDINE 2,6-DIMETHOXY-3-NITROPYRIDINE 18677-41-3 C7H8N2O4
2,5-Diaminopyridine dihydrochloride 2,5-Diaminopyridine dihydrochloride 26878-35-3 C5H9Cl2N3
ETHYL 2,4-DICHLORO-6-METHYLPYRIDINE-3-CARBOXYLATE ETHYL 2,4-DICHLORO-6-METHYLPYRIDINE-3-CARBOXYLATE 86129-63-7 C9H9Cl2NO2
3-CHLORO-4-IODOPYRIDINE 3-CHLORO-4-IODOPYRIDINE 77332-79-7 C5H3ClIN
3-AMINO-PYRIDINE-4-CARBALDEHYDE 3-AMINO-PYRIDINE-4-CARBALDEHYDE 55279-29-3 C6H6N2O
2-Fluoro-3-trifluoromethylpyridine 2-Fluoro-3-trifluoromethylpyridine 65753-52-8 C6H3F4N
2-Chloro-5-methyl-3-nitropyridine 2-Chloro-5-methyl-3-nitropyridine 23056-40-8 C6H5ClN2O2
2-Hydroxy-5-trifluoromethylpyridine 2-Hydroxy-5-trifluoromethylpyridine 33252-63-0 C6H4F3NO
2-AMINO-3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE 2-AMINO-3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE 72600-65-8 C6H4F4N2
2-Cyanopyridine 2-Cyanopyridine 100-70-9 C6H4N2
2-Bromopyridine N-oxide hydrochloride 2-Bromopyridine N-oxide hydrochloride 80866-91-7 C5H5BrClNO
2,6-Dihydroxy-5-fluoro-3-cyanopyridine 2,6-Dihydroxy-5-fluoro-3-cyanopyridine 113237-18-6 C6H3FN2O2
2,6-Dichloro-4-(trifluoromethyl)nicotinonitrile 2,6-Dichloro-4-(trifluoromethyl)nicotinonitrile 13600-42-5 C7HCl2F3N2
2-(Methylamino)pyridine 2-(Methylamino)pyridine 4597-87-9 C6H8N2
4-(Trifluoromethyl)pyridin-3-amine 4-(Trifluoromethyl)pyridin-3-amine 175204-80-5 C6H5F3N2
5-Bromo-6-chloropyridine-3-sulfonyl chloride 5-Bromo-6-chloropyridine-3-sulfonyl chloride 216394-05-7 C5H2BrCl2NO2S
3-Chloropyridine-2-carboxylic acid 3-Chloropyridine-2-carboxylic acid 57266-69-0 C6H4ClNO2
5-HYDROXYPYRIDINE-2-CARBOXYLIC ACID 5-HYDROXYPYRIDINE-2-CARBOXYLIC ACID 15069-92-8 C6H5NO3
4-BROMOPYRIDIN-2-OL 4-BROMOPYRIDIN-2-OL 36953-37-4 C5H4BrNO
3-Iodo-2-methoxypyridine 3-Iodo-2-methoxypyridine 112197-15-6 C6H6INO
3-[2-(3-Chlorophenyl)ethyl]-2-pyridinecarbonitrile 3-[2-(3-Chlorophenyl)ethyl]-2-pyridinecarbonitrile 31255-57-9 C14H11ClN2
5-Bromonicotinonitrile 5-Bromonicotinonitrile 35590-37-5 C6H3BrN2
4-BROMO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 4-BROMO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 29681-42-3 C7H6BrNO2
4-Phenylpiperidine 4-Phenylpiperidine 771-99-3 C11H15N
5-AMINO-2-IODOPYRIDINE 5-AMINO-2-IODOPYRIDINE 29958-12-1 C5H5IN2
4-Nitro-3-picoline N-oxide 4-Nitro-3-picoline N-oxide 1074-98-2 C6H6N2O3
2-Chloro-3-nitropyridine 2-Chloro-3-nitropyridine 5470-18-8 C5H3ClN2O2
2-METHOXY-3-NITRO-6-PICOLINE 2-METHOXY-3-NITRO-6-PICOLINE 112163-03-8 C7H8N2O3
2,3-Dihydroxypyridine 2,3-Dihydroxypyridine 16867-04-2 C5H5NO2
2-HYDROXY-3-METHYL-5-NITROPYRIDINE 2-HYDROXY-3-METHYL-5-NITROPYRIDINE 21901-34-8 C6H6N2O3
2,3-Dimethylpyridine-N-oxide 2,3-Dimethylpyridine-N-oxide 22710-07-2 C7H9NO
2-Bromo-5-chloropyridine 2-Bromo-5-chloropyridine 40473-01-6 C5H3BrClN
2-Pyridylacetonitrile 2-Pyridylacetonitrile 2739-97-1 C7H6N2
5-Chloro-6-hydroxy-3-pyridinecarboxylic acid 5-Chloro-6-hydroxy-3-pyridinecarboxylic acid 54127-63-8 C6H4ClNO3
2-AMINO-3,5-DICHLORO-6-METHYLPYRIDINE 2-AMINO-3,5-DICHLORO-6-METHYLPYRIDINE 22137-52-6 C6H6Cl2N2
2-FLUORO-3-NITRO-4-PICOLINE 2-FLUORO-3-NITRO-4-PICOLINE 19346-43-1 C6H5FN2O2
5-Chloro-3-pyridinol 5-Chloro-3-pyridinol 74115-12-1 C5H4ClNO
2,3-DIBROMO-5-METHYLPYRIDINE 2,3-DIBROMO-5-METHYLPYRIDINE 29232-39-1 C6H5Br2N
4-Bromo-2-methylpyridine 4-Bromo-2-methylpyridine 22282-99-1 C6H6BrN
5-Methyl-2-pyridineboronic acid 5-Methyl-2-pyridineboronic acid 372963-49-0 C6H8BNO2
6-METHYLPYRIDINE-2-BORONIC ACID 6-METHYLPYRIDINE-2-BORONIC ACID 372963-50-3 C6H8BNO2
3-AMINO-2-BROMO-6-PICOLINE 3-AMINO-2-BROMO-6-PICOLINE 126325-53-9 C6H7BrN2
2-Chloronicotinamide 2-Chloronicotinamide 10366-35-5 C6H5ClN2O
2,3,6-TRIFLUOROPYRIDINE 2,3,6-TRIFLUOROPYRIDINE 3512-18-3 C5H2F3N
2,6-Dichloro-4-methylnicotinonitrile 2,6-Dichloro-4-methylnicotinonitrile 875-35-4 C7H4Cl2N2
4-(2-Aminoethyl)pyridine 4-(2-Aminoethyl)pyridine 13258-63-4 C7H10N2
2-Chloro-5-iodopyridine 2-Chloro-5-iodopyridine 69045-79-0 C5H3ClIN
2,6-Dimethylpyridine N-oxide 2,6-Dimethylpyridine N-oxide 1073-23-0 C7H9NO
5-Bromo-2-methoxy-6-picoline 5-Bromo-2-methoxy-6-picoline 126717-59-7 C7H8BrNO
2-BROMO-6-FLUOROPYRIDINE 2-BROMO-6-FLUOROPYRIDINE 144100-07-2 C5H3BrFN
2,3-Difluoropyridine 2,3-Difluoropyridine 1513-66-2 C5H3F2N
2-Hydroxy-3-methoxypyridine 2-Hydroxy-3-methoxypyridine 20928-63-6 C6H7NO2
2-Bromo-3-hydroxypyridine 2-Bromo-3-hydroxypyridine 6602-32-0 C5H4BrNO
3-Bromo-4-cyanopyridine 3-Bromo-4-cyanopyridine 13958-98-0 C6H3BrN2
3-CYANO-2,6-DIHYDROXY-4-(TRIFLUOROMETHYL)PYRIDINE 3-CYANO-2,6-DIHYDROXY-4-(TRIFLUOROMETHYL)PYRIDINE 3335-46-4 C7H3F3N2O2
2-FLUORO-5-NITRO-6-PICOLINE 2-FLUORO-5-NITRO-6-PICOLINE 18605-16-8 C6H5FN2O2
2-Amino-5-fluoropyridine 2-Amino-5-fluoropyridine 21717-96-4 C5H5FN2
4-Hydroxypyridine-3-sulfonic acid 4-Hydroxypyridine-3-sulfonic acid 51498-37-4 C5H5NO4S
5-Fluoro-2-methylpyridine 5-Fluoro-2-methylpyridine 31181-53-0 C6H6FN
5-Chloropyridine-2-carboxylic acid 5-Chloropyridine-2-carboxylic acid 86873-60-1 C6H4ClNO2
2,6-DIMETHYL-PYRIDIN-4-YLAMINE 2,6-DIMETHYL-PYRIDIN-4-YLAMINE 3512-80-9 C7H10N2
4-Bromo-2,6-dimethylpyridine 4-Bromo-2,6-dimethylpyridine 5093-70-9 C7H8BrN
6-CHLORO-5-METHYLPYRIDINE-3-BORONIC ACID 6-CHLORO-5-METHYLPYRIDINE-3-BORONIC ACID 1003043-40-0 C6H7BClNO2
4-Amino-2-fluoropyridine 4-Amino-2-fluoropyridine 18614-51-2 C5H5FN2
4-Chloro-2,3-dimethylpyridine 1-oxide 4-Chloro-2,3-dimethylpyridine 1-oxide 59886-90-7 C7H8ClNO
3-Bromo-5-fluoropyridine 3-Bromo-5-fluoropyridine 407-20-5 C5H3BrFN
4-Chloropyridine-3-carboxaldehyde 4-Chloropyridine-3-carboxaldehyde 114077-82-6 C6H4ClNO
6-CHLORO-2-CYANO-3-NITROPYRIDINE 6-CHLORO-2-CYANO-3-NITROPYRIDINE 93683-65-9 C6H2ClN3O2
2-Chloro-5-hydroxypyridine 2-Chloro-5-hydroxypyridine 41288-96-4 C5H4ClNO
2-BROMO-ISONICOTINAMIDE 2-BROMO-ISONICOTINAMIDE 29840-73-1 C6H5BrN2O
2-CYANO-4-METHYLPYRIDINE 2-CYANO-4-METHYLPYRIDINE 1620-76-4 C7H6N2
2-(Trifluoromethyl)pyridine 2-(Trifluoromethyl)pyridine 368-48-9 C6H4F3N
4-Amino-2-picoline 4-Amino-2-picoline 18437-58-6 C6H8N2
ETHYL 2,4-DIMETHYLPYRIDINE-3-CARBOXYLATE ETHYL 2,4-DIMETHYLPYRIDINE-3-CARBOXYLATE 37669-78-6 C10H13NO2
4-Ethoxy-3-nitropyridine 4-Ethoxy-3-nitropyridine 1796-84-5 C7H8N2O3
4-Methyl-3-nitropyridine 4-Methyl-3-nitropyridine 5832-44-0 C6H6N2O2
3-Hydroxypicolinic acid 3-Hydroxypicolinic acid 874-24-8 C6H5NO3
2-BROMO-3-NITRO-5-METHYL PYRIDINE 2-BROMO-3-NITRO-5-METHYL PYRIDINE 23056-46-4 C6H5BrN2O2
2-Picolylamine 2-Picolylamine 3731-51-9 C6H8N2
2-Chloro-5-nitropyridine 2-Chloro-5-nitropyridine 4548-45-2 C5H3ClN2O2
5-Bromo-2-chloro-3-nitropyridine 5-Bromo-2-chloro-3-nitropyridine 67443-38-3 C5H2BrClN2O2
2-Chloro-N-(2-chloro-4-methylpyridin-3-yl)nicotinamide 2-Chloro-N-(2-chloro-4-methylpyridin-3-yl)nicotinamide 133627-46-0 C12H9Cl2N3O
4-Amino-2-trifluoromethylpyridine 4-Amino-2-trifluoromethylpyridine 147149-98-2 C6H5F3N2
DIMETHYL 2,6-PYRIDINEDICARBOXYLATE DIMETHYL 2,6-PYRIDINEDICARBOXYLATE 5453-67-8 C9H9NO4
2-Bromo-3-chloro-5-(trifluoromethyl)pyridine 2-Bromo-3-chloro-5-(trifluoromethyl)pyridine 75806-84-7 C6H2BrClF3N
3-Nitro-4(1H)-pyridone 3-Nitro-4(1H)-pyridone 15590-90-6 C5H4N2O3
2-Bromo-3-methylpyridine 2-Bromo-3-methylpyridine 3430-17-9 C6H6BrN
3-Iodopyridine 3-Iodopyridine 1120-90-7 C5H4IN
2-Methoxy-5-fluoropyridine 2-Methoxy-5-fluoropyridine 51173-04-7 C6H6FNO
2-Methoxy-6-methylaminopyridine 2-Methoxy-6-methylaminopyridine 63071-03-4 C7H9NO
2-Hydroxy-3-cyanopyridine 2-Hydroxy-3-cyanopyridine 20577-27-9 C6H4N2O
5-Bromo-2-fluoropyridine-3-carboxaldehyde 5-Bromo-2-fluoropyridine-3-carboxaldehyde 875781-15-0 C6H3BrFNO
3-CHLORO-5-NITROPYRIDINE 3-CHLORO-5-NITROPYRIDINE 22353-33-9 C5H3ClN2O2
3-Amino-4-methylpyridine 3-Amino-4-methylpyridine 3430-27-1 C6H8N2
2-Chloro-3-iodopyridine 2-Chloro-3-iodopyridine 78607-36-0 C5H3ClIN
4-Amino-3-chloropyridine 4-Amino-3-chloropyridine 19798-77-7 C5H5ClN2
2-Hydroxy-3-trifluoromethylpyridine 2-Hydroxy-3-trifluoromethylpyridine 22245-83-6 C6H4F3NO
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