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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-FORMYL-5-PICOLINE 2-FORMYL-5-PICOLINE 4985-92-6 C7H7NO
2,6-Diiodopyridine 2,6-Diiodopyridine 53710-17-1 C5H3I2N
4-FLUORO-7-AZAINDOLE 4-FLUORO-7-AZAINDOLE 640735-23-5 C7H5FN2
N-BOC-3-HYDROXY-1,2,3,6-TETRAHYDROPYRIDINE N-BOC-3-HYDROXY-1,2,3,6-TETRAHYDROPYRIDINE 224779-27-5 C10H17NO3
4-Ethynylpyridine hydrochloride 4-Ethynylpyridine hydrochloride 352530-29-1 C7H6ClN
2-Amino-3-methoxypyridine 2-Amino-3-methoxypyridine 10201-71-5 C6H8N2O
2-Methyl-3-nitropyridine hydrochloride 2-Methyl-3-nitropyridine hydrochloride 63585-69-3 C6H7ClN2O2
3-IODOPYRIDINE-2-CARBONITRILE 3-IODOPYRIDINE-2-CARBONITRILE 827616-52-4 C6H3IN2
5-(Trifluoromethyl)picolinonitrile 5-(Trifluoromethyl)picolinonitrile 95727-86-9 C7H3F3N2
3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOL 3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOL 76041-74-2 C6H3ClF3NS
2,6-DICHLOROPYRIDINE-3-BORONIC ACID 2,6-DICHLOROPYRIDINE-3-BORONIC ACID 148493-34-9 C5H4BCl2NO2
2-BROMO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-PYRIDINE 2-BROMO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-PYRIDINE 458532-82-6 C11H15BBrNO2
2-BROMO-3-CHLORO-5-NITROPYRIDINE 2-BROMO-3-CHLORO-5-NITROPYRIDINE 22353-41-9 C5H2BrClN2O2
Pyridine-2-carboximidamide hydrochloride Pyridine-2-carboximidamide hydrochloride 51285-26-8 C6H8ClN3
(5-Chloropyridin-3-yl)boronic acid (5-Chloropyridin-3-yl)boronic acid 872041-85-5 C5H5BClNO2
2-(Trifluoromethyl)isonicotinic acid 2-(Trifluoromethyl)isonicotinic acid 131747-41-6 C7H4F3NO2
4-Acetamido-2-chloropyridine 4-Acetamido-2-chloropyridine 13602-82-9 C7H7ClN2O
2,3-Dichloro-5-hydroxypyridine 2,3-Dichloro-5-hydroxypyridine 110860-92-9 C5H3Cl2NO
2,6-DICHLORO-3-NITRO-4-AMINOPYRIDINE 2,6-DICHLORO-3-NITRO-4-AMINOPYRIDINE 2897-43-0 C5H3Cl2N3O2
2-BROMO-6-(BROMOMETHYL)PYRIDINE 2-BROMO-6-(BROMOMETHYL)PYRIDINE 83004-10-8 C6H5Br2N
5-CHLORO-2-FORMYLPYRIDINE 5-CHLORO-2-FORMYLPYRIDINE 31181-89-2 C6H4ClNO
1H-Pyrazolo[3,4-b]pyridin-3-amine 1H-Pyrazolo[3,4-b]pyridin-3-amine 6752-16-5 C6H6N4
2,6-BIS(BROMOMETHYL)PYRIDINE 2,6-BIS(BROMOMETHYL)PYRIDINE 7703-74-4 C7H7Br2N
1,4-Dimethyl-3-cyano-6-hydroxypyrid-2-one 1,4-Dimethyl-3-cyano-6-hydroxypyrid-2-one 27074-03-9 C8H8N2O2
4,6-DICHLORO-PYRIDIN-3-YLAMINE 4,6-DICHLORO-PYRIDIN-3-YLAMINE 7321-93-9 C5H4Cl2N2
2-Iodo-3-methylpyridine 2-Iodo-3-methylpyridine 22282-58-2 C6H6IN
3-[[[2-[[(4-Cyanophenyl)amino]methyl]-1-methyl-1H-benzimidazol-5-yl]carbonyl]pyridin-2-ylamino]propionic acid ethyl ester 3-[[[2-[[(4-Cyanophenyl)amino]methyl]-1-methyl-1H-benzimidazol-5-yl]carbonyl]pyridin-2-ylamino]propionic acid ethyl ester 211915-84-3 C27H26N6O3
2-CHLORO-4-IODO-3-METHYLPYRIDINE 2-CHLORO-4-IODO-3-METHYLPYRIDINE 153034-88-9 C6H5ClIN
2-BROMO-4-HYDROXYPYRIDINE 2-BROMO-4-HYDROXYPYRIDINE 36953-40-9 C5H4BrNO
ISONICOTINOYL CHLORIDE HYDROCHLORIDE ISONICOTINOYL CHLORIDE HYDROCHLORIDE 39178-35-3 C6H5Cl2NO
2-Fluoro-4-chloropyridine 2-Fluoro-4-chloropyridine 34941-92-9 C5H3ClFN
3-BENZYLPYRIDINE 3-BENZYLPYRIDINE 620-95-1 C12H11N
5-ETHYL-2-VINYL PYRIDINE 5-ETHYL-2-VINYL PYRIDINE 5408-74-2 C9H11N
5-AMINO-2-METHOXY-4-PICOLINE 5-AMINO-2-METHOXY-4-PICOLINE 6635-91-2 C7H10N2O
3-Benzoylpyridine 3-Benzoylpyridine 5424-19-1 C12H9NO
2,6-Dichloro-3-methylpyridine 2,6-Dichloro-3-methylpyridine 58584-94-4 C6H5Cl2N
DIETHYL 1,4-DIHYDRO-2,4,6-TRIMETHYL-3,5-PYRIDINEDICARBOXYLATE DIETHYL 1,4-DIHYDRO-2,4,6-TRIMETHYL-3,5-PYRIDINEDICARBOXYLATE 632-93-9 C14H21NO4
6-(Morpholin-4-yl)pyridine-3-boronic acid pinacol ester 6-(Morpholin-4-yl)pyridine-3-boronic acid pinacol ester 485799-04-0 C15H23BN2O3
4-AMINO-3-FORMYLPYRIDINE 4-AMINO-3-FORMYLPYRIDINE 42373-30-8 C6H6N2O
4-(Bromoacetyl)pyridine hydrobromide 4-(Bromoacetyl)pyridine hydrobromide 5349-17-7 C7H7Br2NO
2-FLUOROPYRIDINE-4-BORONIC ACID PINACOL ESTER 2-FLUOROPYRIDINE-4-BORONIC ACID PINACOL ESTER 458532-86-0 C11H15BFNO2
4-FLUORO-2-METHYLPYRIDINE 4-FLUORO-2-METHYLPYRIDINE 766-16-5 C6H6FN
4-Methoxy-3-pyridinecarboxaldehyde 4-Methoxy-3-pyridinecarboxaldehyde 82257-15-6 C7H7NO2
2,2'-Bipyridine-5,5'-dicarboxylic acid 2,2'-Bipyridine-5,5'-dicarboxylic acid 1802-30-8 C12H8N2O4
2-Chloro-3-methoxy-5-nitropyridine 2-Chloro-3-methoxy-5-nitropyridine 75711-00-1 C6H5ClN2O3
3-PYRIDYLAMIDOXIME 3-PYRIDYLAMIDOXIME 1594-58-7 C6H7N3O
2-NITRO-PYRIDIN-4-YLAMINE 2-NITRO-PYRIDIN-4-YLAMINE 14916-64-4 C5H5N3O2
Cetylpyridinium chloride monohydrate Cetylpyridinium chloride monohydrate 6004-24-6 C21H40ClNO
2-METHYL-6-METHOXYPYRIDINE-3-BORONIC ACID 2-METHYL-6-METHOXYPYRIDINE-3-BORONIC ACID 459856-12-3 C7H10BNO3
1-FLUORO-2,6-DICHLOROPYRIDINIUM TETRAFLUOROBORATE 1-FLUORO-2,6-DICHLOROPYRIDINIUM TETRAFLUOROBORATE 140623-89-8 C5H3BCl2F5N
2-(2-Chloroethyl)pyridine 2-(2-Chloroethyl)pyridine 16927-00-7 C7H8ClN
5,6-DIMETHYL-2-OXO-1,2-DIHYDRO-PYRIDINE-3-CARBONITRILE 5,6-DIMETHYL-2-OXO-1,2-DIHYDRO-PYRIDINE-3-CARBONITRILE 72716-80-4 C8H8N2O
2,6-Dichloro-3-fluoropyridine 2,6-Dichloro-3-fluoropyridine 52208-50-1 C5H2Cl2FN
3-Aminopyridine-2-carboxylic acid methyl ester 3-Aminopyridine-2-carboxylic acid methyl ester 36052-27-4 C7H8N2O2
2-FLUOROISONICOTINONITRILE 2-FLUOROISONICOTINONITRILE 3939-14-8 C6H3FN2
2-BROMO-3-PYRIDINEBORONIC ACID PINACOL ESTER 2-BROMO-3-PYRIDINEBORONIC ACID PINACOL ESTER 452972-12-2 C11H15BBrNO2
5-Chloro-2-(trifluoromethyl)pyridine 5-Chloro-2-(trifluoromethyl)pyridine 349-94-0 C6H3ClF3N
5-Bromo-2-chloro-4-methyl-3-nitro-pyridine 5-Bromo-2-chloro-4-methyl-3-nitro-pyridine 884495-15-2 C6H4BrClN2O2
6-Chloropyridine-3-carbohydrazide 6-Chloropyridine-3-carbohydrazide 168893-66-1 C6H6ClN3O
3,5-Dichloro-2-pyridinecarboxylic acid 3,5-Dichloro-2-pyridinecarboxylic acid 81719-53-1 C6H3Cl2NO2
Pyridine-3-sulfonyl chloride hydrochloride Pyridine-3-sulfonyl chloride hydrochloride 42899-76-3 C5H5Cl2NO2S
2-CHLORO-5-FLUOROPYRIDINE-3-BORONIC ACID 2-CHLORO-5-FLUOROPYRIDINE-3-BORONIC ACID 913373-43-0 C5H4BClFNO2
2,3-DIBROMO-6-PICOLINE 2,3-DIBROMO-6-PICOLINE 261373-04-0 C6H5Br2N
2,3-Dimethoxypyridine 2,3-Dimethoxypyridine 52605-97-7 C7H9NO2
4-Pyridinepropanol 4-Pyridinepropanol 2629-72-3 C8H11NO
1-FLUORO-2,4,6-TRIMETHYLPYRIDINIUM TETRAFLUOROBORATE 1-FLUORO-2,4,6-TRIMETHYLPYRIDINIUM TETRAFLUOROBORATE 109705-14-8 C8H11BF5N
4-(5-AMINOPYRIDIN-2-YL)PIPERAZINE-1-CARBOXYLIC ACID TERT-BUTYL ESTER 4-(5-AMINOPYRIDIN-2-YL)PIPERAZINE-1-CARBOXYLIC ACID TERT-BUTYL ESTER 119285-07-3 C14H22N4O2
5-Methylpyridine-3-sulfonic acid 5-Methylpyridine-3-sulfonic acid 4808-70-2 C6H7NO3S
3-Aminoisonicotinic acid hydrate (1:1) 3-Aminoisonicotinic acid hydrate (1:1) 7529-20-6 C6H8N2O3
N-Butyl-3-cyano-6-hydroxy-4-methyl-2-pyridone N-Butyl-3-cyano-6-hydroxy-4-methyl-2-pyridone 39108-47-9 C11H14N2O2
2-METHOXY-3-PYRIDINECARBOXALDEHYDE 2-METHOXY-3-PYRIDINECARBOXALDEHYDE 71255-09-9 C7H7NO2
2-METHYLPYRIDINE-4-BORONIC ACID PINACOL ESTER 2-METHYLPYRIDINE-4-BORONIC ACID PINACOL ESTER 660867-80-1 C12H18BNO2
2-Chloro-3-methylaminopyridine 2-Chloro-3-methylaminopyridine 40932-43-2 C6H7ClN2
2,5-DICHLORO-3-PICOLINE 2,5-DICHLORO-3-PICOLINE 59782-88-6 C6H5Cl2N
4-CHLORO-3-HYDROXYPYRIDINE 4-CHLORO-3-HYDROXYPYRIDINE 96630-88-5 C5H4ClNO
2,6-Pyridinedicarboxylic acid monomethyl ester 2,6-Pyridinedicarboxylic acid monomethyl ester 7170-36-7 C8H7NO4
2-Hydroxy-6-methylpyridine-3-carboxylic acid 2-Hydroxy-6-methylpyridine-3-carboxylic acid 38116-61-9 C7H7NO3
1,6-NAPHTHYRIDINE 1,6-NAPHTHYRIDINE 253-72-5 C8H6N2
2-Methylisonicotinic acid 2-Methylisonicotinic acid 4021-11-8 C7H7NO2
2-Methylamino-3-nitro-6-chloropyridine 2-Methylamino-3-nitro-6-chloropyridine 33742-70-0 C6H6ClN3O2
3-CYANO-4,6-DIMETHYL-2-MERCAPTOPYRIDINE 3-CYANO-4,6-DIMETHYL-2-MERCAPTOPYRIDINE 54585-47-6 C8H8N2S
5-(Trifluoromethyl)nicotinic acid 5-(Trifluoromethyl)nicotinic acid 131747-40-5 C7H4F3NO2
1-(2-CHLORO-PYRIDIN-4-YL)-ETHANONE 1-(2-CHLORO-PYRIDIN-4-YL)-ETHANONE 23794-15-2 C7H6ClNO
3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOCARBOXAMIDE 3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOCARBOXAMIDE 175277-46-0 C7H4ClF3N2S
5-AMINO-2-PYRIDINOL HYDROCHLORIDE, 95 5-AMINO-2-PYRIDINOL HYDROCHLORIDE, 95 117865-72-2 C5H7ClN2O
5-BROMO-2,3-DIAMINOPYRIDINE, 97 5-BROMO-2,3-DIAMINOPYRIDINE, 97 4635-08-9 C5H6BrN3
AMMONIUM ALGINATE AMMONIUM ALGINATE 9005-34-9 C13H16N3NaO4S
(2-METHYL-PYRIDIN-3-YL)-METHANOL (2-METHYL-PYRIDIN-3-YL)-METHANOL 56826-61-0 C7H9NO
2-FLUORO-4-IODO-3-PICOLINE 2-FLUORO-4-IODO-3-PICOLINE 153034-80-1 C6H5FIN
5-METHOXY-PYRIDINE-3-CARBALDEHYDE 5-METHOXY-PYRIDINE-3-CARBALDEHYDE 113118-83-5 C7H7NO2
2,4-Dichloro-5-methylpyridine 2,4-Dichloro-5-methylpyridine 56961-78-5 C6H5Cl2N
4-Vinylpyridine 4-Vinylpyridine 100-43-6 C7H7N
5-Hydroxy-3-methylpyridine-2-carbonitrile 5-Hydroxy-3-methylpyridine-2-carbonitrile 228867-86-5 C7H6N2O
2-Iodo-5-hydroxypyridine 2-Iodo-5-hydroxypyridine 129034-38-4 C5H4INO
4,6-Dimethyl-2-hydroxypyridine 4,6-Dimethyl-2-hydroxypyridine 16115-08-5 C7H9NO
4-Fluoro-2-methoxypyridine 4-Fluoro-2-methoxypyridine 96530-81-3 C6H6FNO
5-Fluoro-2-(trifluoromethyl)pyridine 5-Fluoro-2-(trifluoromethyl)pyridine 936841-73-5 C6H3F4N
4-NITROPICOLINIC ACID 4-NITROPICOLINIC ACID 13509-19-8 C6H4N2O4
Methyl 5-hydroxynicotinate Methyl 5-hydroxynicotinate 30766-22-4 C7H7NO3
Pyridine, 5-bromo-2-ethyl- Pyridine, 5-bromo-2-ethyl- 38749-90-5 C7H8BrN
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