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-Chloro-4-picoline 2-Chloro-4-picoline 3678-62-4 C6H6ClN
4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile 4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile 21642-98-8 C7H6N2O2
3-BROMO-2-CHLORO-6-PICOLINE 3-BROMO-2-CHLORO-6-PICOLINE 185017-72-5 C6H5BrClN
6-Methoxynicotinic acid 6-Methoxynicotinic acid 66572-55-2 C7H7NO3
5-CHLORO-2-FLUORO-3-NITROPYRIDINE 5-CHLORO-2-FLUORO-3-NITROPYRIDINE 60186-16-5 C5H2ClFN2O2
2-Amino-3-bromo-5-chloropyridine 2-Amino-3-bromo-5-chloropyridine 26163-03-1 C5H4BrClN2
4-Chloro-3-methylpyridine 4-Chloro-3-methylpyridine 1681-36-3 C6H6ClN
2,4,6-Trichloropyridine 2,4,6-Trichloropyridine 16063-69-7 C5H2Cl3N
3-AMINO-2-BROMO-5-CHLOROPYRIDINE 3-AMINO-2-BROMO-5-CHLOROPYRIDINE 90902-83-3 C5H4BrClN2
3-Amino-2-bromo-5-fluoropyridine 3-Amino-2-bromo-5-fluoropyridine 884495-03-8 C5H4BrFN2
5-Ethyl-2-methylpyridine 5-Ethyl-2-methylpyridine 104-90-5 C8H11N
2-BROMO-5-NITRO-6-PICOLINE 2-BROMO-5-NITRO-6-PICOLINE 22282-96-8 C6H5BrN2O2
2-Chloro-4-methyl-5-nitropyridine 2-Chloro-4-methyl-5-nitropyridine 23056-33-9 C6H5ClN2O2
4-Amino-2-ethoxypyridine 4-Amino-2-ethoxypyridine 89943-12-4 C7H10N2O
3-Methyl-2-pyridone 3-Methyl-2-pyridone 1003-56-1 C6H7NO
3-Bromo-5-methylpyridine 3-Bromo-5-methylpyridine 3430-16-8 C6H6BrN
IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID 133427-08-4 C8H6N2O2
3-Bromo-5-hydroxypyridine 3-Bromo-5-hydroxypyridine 74115-13-2 C5H4BrNO
2-Aminopyridine-5-boronic acid, pinacol ester 2-Aminopyridine-5-boronic acid, pinacol ester 827614-64-2 C11H17BN2O2
2-CYANO-4-NITROPYRIDINE 2-CYANO-4-NITROPYRIDINE 19235-88-2 C6H3N3O2
2-AMINO-6-CHLORO-3-NITROPYRIDINE 2-AMINO-6-CHLORO-3-NITROPYRIDINE 136901-10-5 C5H4ClN3O2
2-Methoxynicotinic acid 2-Methoxynicotinic acid 16498-81-0 C7H7NO3
5-BROMO-2-HYDROXY-4-METHYLPYRIDINE 5-BROMO-2-HYDROXY-4-METHYLPYRIDINE 164513-38-6 C6H6BrNO
2-Fluoro-5-bromo-3-methylpyridine 2-Fluoro-5-bromo-3-methylpyridine 29312-98-9 C6H5BrFN
2-FLUORO-3-METHYLPYRIDINE-5-BORONIC ACID 2-FLUORO-3-METHYLPYRIDINE-5-BORONIC ACID 904326-92-7 C6H7BFNO2
5-Ethylpyridine-2,3-dicarboxylic acid diethyl ester 5-Ethylpyridine-2,3-dicarboxylic acid diethyl ester 105151-39-1 C13H17NO4
5-HYDROXY-2-METHOXYPYRIDINE 5-HYDROXY-2-METHOXYPYRIDINE 51834-97-0 C6H7NO2
N-Methylpyrrole-2-carboxylic acid N-Methylpyrrole-2-carboxylic acid 6973-60-0 C6H7NO2
2-Amino-5-iodopyridine 2-Amino-5-iodopyridine 20511-12-0 C5H5IN2
2,5-Dibromopyridine 2,5-Dibromopyridine 624-28-2 C5H3Br2N
4-AMINO-3-HYDROXY PYRIDINE 4-AMINO-3-HYDROXY PYRIDINE 52334-53-9 C5H6N2O
5-FLUORO-2-HYDROXY-3-NITROPYRIDINE 5-FLUORO-2-HYDROXY-3-NITROPYRIDINE 136888-20-5 C5H3FN2O3
3-(2-Chloroethyl)-2-methylpyrido[1,2-a]pyrimidin-4-one 3-(2-Chloroethyl)-2-methylpyrido[1,2-a]pyrimidin-4-one 41078-70-0 C11H11ClN2O
3-Amino-6-hydroxypyridine 3-Amino-6-hydroxypyridine 33630-94-3 C5H6N2O
4-Amino-2-chloro-3-nitropyridine 4-Amino-2-chloro-3-nitropyridine 2789-25-5 C5H4ClN3O2
2-Chloro-4-hydroxypyridine 2-Chloro-4-hydroxypyridine 17368-12-6 C5H4ClNO
2-Amino-6-methoxypyridine 2-Amino-6-methoxypyridine 17920-35-3 C6H8N2O
2-Methoxypyridin-3-amine 2-Methoxypyridin-3-amine 20265-38-7 C6H8N2O
2-Chloro-3-methyl-5-nitropyridine 2-Chloro-3-methyl-5-nitropyridine 22280-56-4 C6H5ClN2O2
5-Bromo-2-methylpyridine 5-Bromo-2-methylpyridine 3430-13-5 C6H6BrN
2-CYANO-3-HYDROXYPYRIDINE 2-CYANO-3-HYDROXYPYRIDINE 932-35-4 C6H4N2O
2-Amino-5-chloro-3-nitropyridine 2-Amino-5-chloro-3-nitropyridine 5409-39-2 C5H4ClN3O2
2-CHLORO-3,5-DINITROPYRIDINE 2-CHLORO-3,5-DINITROPYRIDINE 2578-45-2 C5H2ClN3O4
(2-AMINO-PYRIDIN-4-YL)-METHANOL (2-AMINO-PYRIDIN-4-YL)-METHANOL 105250-17-7 C6H8N2O
5-Methylpyridin-3-amine 5-Methylpyridin-3-amine 3430-19-1 C6H8N2
5-Bromo-3-formylpyridine 5-Bromo-3-formylpyridine 113118-81-3 C6H4BrNO
2-BROMO-4,6-DIMETHYLPYRIDINE 2-BROMO-4,6-DIMETHYLPYRIDINE 4926-26-5 C7H8BrN
2-BROMO-3-NITRO-4-PICOLINE 2-BROMO-3-NITRO-4-PICOLINE 23056-45-3 C6H5BrN2O2
3-FLUORO-2-HYDROXYPYRIDINE 3-FLUORO-2-HYDROXYPYRIDINE 1547-29-1 C5H4FNO
3-BROMOPYRIDIN-4-YLBORONIC ACID 3-BROMOPYRIDIN-4-YLBORONIC ACID 458532-99-5 C5H5BBrNO2
2-Amino-5-bromopyridine 2-Amino-5-bromopyridine 1072-97-5 C5H5BrN2
2,4-Dihydroxy-3-nitropyridine 2,4-Dihydroxy-3-nitropyridine 89282-12-2 C5H4N2O4
2,2'-DITHIOBIS(5-NITROPYRIDINE) 2,2'-DITHIOBIS(5-NITROPYRIDINE) 2127-10-8 C10H6N4O4S2
4-Chloro-2-hydroxypyridine 4-Chloro-2-hydroxypyridine 40673-25-4 C5H4ClNO
2-Amino-3-nitro-4-picoline 2-Amino-3-nitro-4-picoline 6635-86-5 C6H7N3O2
3,4-Diaminopyridine 3,4-Diaminopyridine 54-96-6 C5H7N3
6-Methylpyridine-2-carbonitrile 6-Methylpyridine-2-carbonitrile 1620-75-3 C7H6N2
5-BROMO-2,3-DIHYDRO-1H-PYRROLO[2,3-B]PYRIDINE 5-BROMO-2,3-DIHYDRO-1H-PYRROLO[2,3-B]PYRIDINE 115170-40-6 C7H7BrN2
3,5-BIS(METHYLSULFONYL)ANILINE 3,5-BIS(METHYLSULFONYL)ANILINE 101990-69-6 C6H5Cl2NO
5-Amino-2-methylpyridine 5-Amino-2-methylpyridine 3430-14-6 C6H8N2
4-Nitropyridine N-oxide 4-Nitropyridine N-oxide 1124-33-0 C5H4N2O3
3-BROMOPYRIDINE-2-CARBOXYLIC ACID 3-BROMOPYRIDINE-2-CARBOXYLIC ACID 30683-23-9 C6H4BrNO2
2,4-Dihydroxypyridine 2,4-Dihydroxypyridine 626-03-9 C5H5NO2
4-Nitro-2,3-lutidine-N-oxide 4-Nitro-2,3-lutidine-N-oxide 37699-43-7 C7H8N2O3
3-Bromo-2-pyridinamine 3-Bromo-2-pyridinamine 13534-99-1 C5H5BrN2
3-Amino-5-fluoropyridine 3-Amino-5-fluoropyridine 210169-05-4 C5H5FN2
2-Dimethylaminopyridine 2-Dimethylaminopyridine 5683-33-0 C7H10N2
5-BROMO-2-METHYLPYRIDIN-3-AMINE 5-BROMO-2-METHYLPYRIDIN-3-AMINE 914358-73-9 C6H7BrN2
5,6-DIBROMOPYRIDINE-3-CARBOXYLIC ACID 5,6-DIBROMOPYRIDINE-3-CARBOXYLIC ACID 29241-64-3 C6H3Br2NO2
2-Vinylpyridine 2-Vinylpyridine 100-69-6 C7H7N
3-Hydroxypyridine 3-Hydroxypyridine 109-00-2 C5H5NO
4-Bromo-2,6-diaminopyridine 4-Bromo-2,6-diaminopyridine 329974-09-6 C5H6BrN3
6-Chloro-2,3-diaminopyridine 6-Chloro-2,3-diaminopyridine 40851-95-4 C5H6ClN3
2,3-Dibromo-5-fluoropyridine 2,3-Dibromo-5-fluoropyridine 878207-82-0 C5H2Br2FN
4-IODO-2-METHOXYPYRIDINE 4-IODO-2-METHOXYPYRIDINE 98197-72-9 C6H6INO
2-BROMO-5-CHLORO-3-NITROPYRIDINE 2-BROMO-5-CHLORO-3-NITROPYRIDINE 75806-86-9 C5H2BrClN2O2
2-{[4-(3-Methoxypropoxy)-3-methylpyridine-2-yl]methylthio}-1H-benzimidazole 2-{[4-(3-Methoxypropoxy)-3-methylpyridine-2-yl]methylthio}-1H-benzimidazole 117977-21-6 C18H21N3O2S
6-Bromopyridine-2-boronic acid pinacol ester 6-Bromopyridine-2-boronic acid pinacol ester 651358-83-7 C11H15BBrNO2
2-Bromopyridine N-oxide hydrobromide 2-Bromopyridine N-oxide hydrobromide 206860-49-3 C5H5Br2NO
2-Cyano-5-nitropyridine 2-Cyano-5-nitropyridine 100367-55-3 C6H3N3O2
4-Iodopyridine 4-Iodopyridine 15854-87-2 C5H4IN
6-AMINO-5-METHYLNICOTINONITRILE 6-AMINO-5-METHYLNICOTINONITRILE 183428-91-3 C7H7N3
5-IODO-6-METHYL-PYRIDIN-2-YLAMINE 5-IODO-6-METHYL-PYRIDIN-2-YLAMINE 75073-11-9 C6H7IN2
2,3,5-Trifluoropyridine 2,3,5-Trifluoropyridine 76469-41-5 C5H2F3N
2-AMINO-5-CHLORO-3-PICOLINE 2-AMINO-5-CHLORO-3-PICOLINE 20712-16-7 C6H7ClN2
4-NITRO-PYRIDIN-2-YLAMINE 4-NITRO-PYRIDIN-2-YLAMINE 4487-50-7 C5H5N3O2
5-Bromo-2-methyl-3-nitropyridine 5-Bromo-2-methyl-3-nitropyridine 911434-05-4 C6H5BrN2O2
2-Chloro-6-trifluoromethylnicotinic acid 2-Chloro-6-trifluoromethylnicotinic acid 280566-45-2 C7H3ClF3NO2
3-CHLOROISONICOTINALDEHYDE 3-CHLOROISONICOTINALDEHYDE 72990-37-5 C6H4ClNO
5-BROMO-2-HYDROXY-3-PICOLINE 5-BROMO-2-HYDROXY-3-PICOLINE 89488-30-2 C6H6BrNO
2-HYDROXY-4-PYRIDINECARBOXALDEHYDE 2-HYDROXY-4-PYRIDINECARBOXALDEHYDE 188554-13-4 C6H5NO2
2-Amino-5-bromo-3-nitropyridine 2-Amino-5-bromo-3-nitropyridine 6945-68-2 C5H4BrN3O2
3-CHLORO-2-METHOXY-5-(TRIFLUOROMETHYL)PYRIDINE 3-CHLORO-2-METHOXY-5-(TRIFLUOROMETHYL)PYRIDINE 175136-17-1 C7H5ClF3NO
2-Amino-4-(trifluoromethyl)pyridine 2-Amino-4-(trifluoromethyl)pyridine 106447-97-6 C6H5F3N2
2-Amino-4-chloropyridine 2-Amino-4-chloropyridine 19798-80-2 C5H5ClN2
Clopyralid Clopyralid 1702-17-6 C6H3Cl2NO2
5-BROMO-2,3-DIFLUOROPYRIDINE 5-BROMO-2,3-DIFLUOROPYRIDINE 89402-44-8 C5H2BrF2N
5-Amino-2-chloro-3-picoline 5-Amino-2-chloro-3-picoline 38186-82-2 C6H7ClN2
2-Bromo-3-chloropyridine 2-Bromo-3-chloropyridine 96424-68-9 C5H3BrClN
2-CHLORO-3-FLUORO-4-IODOPYRIDINE 2-CHLORO-3-FLUORO-4-IODOPYRIDINE 148639-07-0 C5H2ClFIN
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