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
PYRIDINE-2-CARBOXAMIDE PYRIDINE-2-CARBOXAMIDE 1452-77-3 C6H6N2O
2-(2-Hydroxyethyl)pyridine 2-(2-Hydroxyethyl)pyridine 103-74-2 C7H9NO
4-Methylnicotinic acid 4-Methylnicotinic acid 3222-50-2 C7H7NO2
2-Amino-3-bromo-5-nitropyridine 2-Amino-3-bromo-5-nitropyridine 15862-31-4 C5H4BrN3O2
Imidazo[1,2-a]pyridine Imidazo[1,2-a]pyridine 274-76-0 C7H6N2
5-Bromopyridine-3-boronic acid 5-Bromopyridine-3-boronic acid 452972-09-7 C5H5BBrNO2
2-Chloro-4-methylpyrimidine 2-Chloro-4-methylpyrimidine 13036-57-2 C5H5ClN2
3-HYDROXYPICOLINAMIDE 3-HYDROXYPICOLINAMIDE 933-90-4 C6H6N2O2
4-Bromo-2-methyl-3-pyridinamine 4-Bromo-2-methyl-3-pyridinamine 126325-48-2 C6H7BrN2
5-Bromo-2,3-dichloropyridine 5-Bromo-2,3-dichloropyridine 97966-00-2 C5H2BrCl2N
6-Chloro-2-methyl-3-nitropyridine 6-Chloro-2-methyl-3-nitropyridine 22280-60-0 C6H5ClN2O2
Methyl 4-aminopyridine-3-carboxylate Methyl 4-aminopyridine-3-carboxylate 16135-36-7 C7H8N2O2
3-Amino-6-fluoro-2-methylpyridine 3-Amino-6-fluoro-2-methylpyridine 28489-47-6 C6H7FN2
2-Chloro-5-fluoronicotinic acid 2-Chloro-5-fluoronicotinic acid 38186-88-8 C6H3ClFNO2
2-Amino-5-bromo-4-methyl-3-nitropyridine 2-Amino-5-bromo-4-methyl-3-nitropyridine 100367-40-6 C6H6BrN3O2
2-Chloro-4,6-dimethylpyridine 2-Chloro-4,6-dimethylpyridine 30838-93-8 C7H8ClN
2-Amino-3-nitro-6-picoline 2-Amino-3-nitro-6-picoline 21901-29-1 C6H7N3O2
3,4-DIBROMOPYRIDINE 3,4-DIBROMOPYRIDINE 13534-90-2 C5H3Br2N
3-Fluoro-4-methylpyridine 3-Fluoro-4-methylpyridine 399-88-2 C6H6FN
4-AMINO-2-CHLOROPYRIDINE 4-AMINO-2-CHLOROPYRIDINE 2897-42-9 C5H5ClN2.ClH
3-Bromo-2-cyanopyridine 3-Bromo-2-cyanopyridine 55758-02-6 C6H3BrN2
3-Hydroxy-6-methylpyridine 3-Hydroxy-6-methylpyridine 1121-78-4 C6H7NO
2-Hydroxyisonicotinic acid 2-Hydroxyisonicotinic acid 22282-72-0 C6H5NO3
3-Chloroisonicotinic acid 3-Chloroisonicotinic acid 88912-27-0 C6H4ClNO2
3-Methyl-2-nitropyridine 3-Methyl-2-nitropyridine 18368-73-5 C6H6N2O2
3-Bromo-2,6-dichloropyridine 3-Bromo-2,6-dichloropyridine 866755-20-6 C5H2BrCl2N
3-Methylpicolinonitrile 3-Methylpicolinonitrile 20970-75-6 C7H6N2
2-Chloro-6-methylnicotinic acid 2-Chloro-6-methylnicotinic acid 30529-70-5 C7H6ClNO2
Methyl 2-aminonicotinate Methyl 2-aminonicotinate 14667-47-1 C7H8N2O2
Pyridine-N-oxide Pyridine-N-oxide 694-59-7 C5H5NO
(5-BROMO-PYRIDIN-3-YL)-METHANOL (5-BROMO-PYRIDIN-3-YL)-METHANOL 37669-64-0 C6H6BrNO
4-Hydroxypyridine 4-Hydroxypyridine 626-64-2 C5H5NO
2-Hydroxy-6-methylpyridine 2-Hydroxy-6-methylpyridine 3279-76-3 C6H7NO
2-METHOXY-3,5-DIBROMO-PYRIDINE 2-METHOXY-3,5-DIBROMO-PYRIDINE 13472-60-1 C6H5Br2NO
2-Chloro-6-methoxy-3-nitropyridine 2-Chloro-6-methoxy-3-nitropyridine 38533-61-8 C6H5ClN2O3
2-Amino-4-bromopyridine 2-Amino-4-bromopyridine 84249-14-9 C5H5BrN2
3-Bromo-4-methylpyridine 3-Bromo-4-methylpyridine 3430-22-6 C6H6BrN
2,4,6-TRIFLUOROPYRIDINE 2,4,6-TRIFLUOROPYRIDINE 3512-17-2 C5H2F3N
2-Bromo-5-nitropyridine 2-Bromo-5-nitropyridine 4487-59-6 C5H3BrN2O2
4-(2-Pyridinyl)benzaldehyde 4-(2-Pyridinyl)benzaldehyde 127406-56-8 C12H9NO
2,6-Dimethoxypyridine 2,6-Dimethoxypyridine 6231-18-1 C7H9NO2
2-Fluoro-4-iodopyridine 2-Fluoro-4-iodopyridine 22282-70-8 C5H3FIN
2-Methoxy-5-nitro-3-picoline 2-Methoxy-5-nitro-3-picoline 89694-10-0 C7H8N2O3
6-CHLOROPYRIDINE-2-BORONIC ACID PINACOL ESTER 6-CHLOROPYRIDINE-2-BORONIC ACID PINACOL ESTER 652148-92-0 C11H15BClNO2
2,4-DIHYDROXY-6-METHYLPYRIDINE 2,4-DIHYDROXY-6-METHYLPYRIDINE 3749-51-7 C6H7NO2
2-Bromo-3-methyl-5-nitropyridine 2-Bromo-3-methyl-5-nitropyridine 23132-21-0 C6H5BrN2O2
3-BROMO-2-FLUORO-6-PICOLINE 3-BROMO-2-FLUORO-6-PICOLINE 375368-78-8 C6H5BrFN
2-Bromo-3-nitropyridine 2-Bromo-3-nitropyridine 19755-53-4 C5H3BrN2O2
4-Amino-3-nitropyridine 4-Amino-3-nitropyridine 1681-37-4 C5H5N3O2
3-Ethylpyridine 3-Ethylpyridine 536-78-7 C7H9N
3,4,5-Trichloropyridine 3,4,5-Trichloropyridine 33216-52-3 C5H2Cl3N
5-(Trifluoromethyl)pyridin-2-amine 5-(Trifluoromethyl)pyridin-2-amine 74784-70-6 C6H5F3N2
3,5-Dibromo-4-methylpyridine 3,5-Dibromo-4-methylpyridine 3430-23-7 C6H5Br2N
2-BROMOPYRIDIN-3-YLBORONIC ACID 2-BROMOPYRIDIN-3-YLBORONIC ACID 452972-08-6 C5H5BBrNO2
5-Chloro-2-methoxypyridine 5-Chloro-2-methoxypyridine 13473-01-3 C6H6ClNO
2-Methoxypyridne-4-boronic acid 2-Methoxypyridne-4-boronic acid 762262-09-9 C6H8BNO3
6-Bromopyridine-2-carbaldehyde 6-Bromopyridine-2-carbaldehyde 34160-40-2 C6H4BrNO
2-Bromo-3-methyl-5-chloropyridine 2-Bromo-3-methyl-5-chloropyridine 65550-77-8 C6H5BrClN
4-(Trifluoromethyl)nicotinonitrile 4-(Trifluoromethyl)nicotinonitrile 13600-43-6 C7H3F3N2
2-Ethoxy-5-nitropyridine 2-Ethoxy-5-nitropyridine 31594-45-3 C7H8N2O3
2,6-Dichloro-5-fluoro-3-pyridinecarbonitrile 2,6-Dichloro-5-fluoro-3-pyridinecarbonitrile 82671-02-1 C6HCl2FN2
2-Ethoxypyridine 2-Ethoxypyridine 14529-53-4 C7H9NO
2-Acetyl-6-bromopyridine 2-Acetyl-6-bromopyridine 49669-13-8 C7H6BrNO
Ethyl 2-methylnicotinate Ethyl 2-methylnicotinate 1721-26-2 C9H11NO2
3-Cyano-4,6-dimethyl-2-hydroxypyridine 3-Cyano-4,6-dimethyl-2-hydroxypyridine 769-28-8 C8H8N2O
3-Bromo-6-chloro-2-methylpyridine 3-Bromo-6-chloro-2-methylpyridine 132606-40-7 C6H5BrClN
2-Acetamido-5-nitropyridine 2-Acetamido-5-nitropyridine 5093-64-1 C7H7N3O3
2,5-Difluoropyridine 2,5-Difluoropyridine 84476-99-3 C5H3F2N
3-Bromo-2-hydroxy-5-nitropyridine 3-Bromo-2-hydroxy-5-nitropyridine 15862-33-6 C5H3BrN2O3
2-ETHYNYLPYRIDINE 2-ETHYNYLPYRIDINE 1945-84-2 C7H5N
4-Benzylpyridine 4-Benzylpyridine 2116-65-6 C12H11N
4-Bromo-3-chloropyridine 4-Bromo-3-chloropyridine 73583-41-2 C5H3BrClN
5-Methylnicotinic acid 5-Methylnicotinic acid 3222-49-9 C7H7NO2
1-(2-Hydroxy-3-sulfopropyl)-pyridinium betane 1-(2-Hydroxy-3-sulfopropyl)-pyridinium betane 3918-73-8 C8H11NO4S
2,3-Diaminopyridine 2,3-Diaminopyridine 452-58-4 C5H7N3
3-Phenylpyridine 3-Phenylpyridine 1008-88-4 C11H9N
Methyl 4-aminopyridine-2-carboxylate Methyl 4-aminopyridine-2-carboxylate 71469-93-7 C7H8N2O2
3-Hydroxy-2-iodo-6-methylpyridine 3-Hydroxy-2-iodo-6-methylpyridine 23003-30-7 C6H6INO
3-Bromo-4-hydroxypyridine 3-Bromo-4-hydroxypyridine 36953-41-0 C5H4BrNO
2,6-Dichloroisonicotinic acid 2,6-Dichloroisonicotinic acid 5398-44-7 C6H3Cl2NO2
4-Pyridinemethaneamine 4-Pyridinemethaneamine 3731-53-1 C6H8N2
4-Pyridineacetic acid hydrochloride 4-Pyridineacetic acid hydrochloride 6622-91-9 C7H8ClNO2
2,5-Dibromo-4-methylpyridine 2,5-Dibromo-4-methylpyridine 3430-26-0 C6H5Br2N
3-Hydroxy-2-nitropyridine 3-Hydroxy-2-nitropyridine 15128-82-2 C5H4N2O3
2-Methoxy-3-fluoro-5-bromopyridine 2-Methoxy-3-fluoro-5-bromopyridine 124432-70-8 C6H5BrFNO
4-(5-BROMOPYRIDIN-2-YL)MORPHOLINE 4-(5-BROMOPYRIDIN-2-YL)MORPHOLINE 200064-11-5 C9H11BrN2O
4-Amino-2,6-dichloropyridine 4-Amino-2,6-dichloropyridine 2587-02-2 C5H4Cl2N2
3-Fluoropyridine 3-Fluoropyridine 372-47-4 C5H4FN
2-Chloro-3-pyridylboronic acid 2-Chloro-3-pyridylboronic acid 381248-04-0 C5H5BClNO2
2,6-Dichloro-1-fluoropyridinium triflate 2,6-Dichloro-1-fluoropyridinium triflate 130433-68-0 C6H3Cl2F4NO3S
5-Bromo-2-chloropyridine 5-Bromo-2-chloropyridine 53939-30-3 C5H3BrClN
4-Chloro-3-methoxy-2-methylpyridine N-oxide 4-Chloro-3-methoxy-2-methylpyridine N-oxide 122307-41-9 C7H8ClNO2
4-Chloro-3-pyridinesulfonamide 4-Chloro-3-pyridinesulfonamide 33263-43-3 C5H5ClN2O2S
4-Hydroxy-2-methylpyridine 4-Hydroxy-2-methylpyridine 18615-86-6 C6H7NO
3-Amino-2-pyridinecarbonitrile 3-Amino-2-pyridinecarbonitrile 42242-11-5 C6H5N3
3-Bromo-5-chloropyridine 3-Bromo-5-chloropyridine 73583-39-8 C5H3BrClN
2-CHLORO-3-NITROPYRIDINE 2-CHLORO-3-NITROPYRIDINE 34515-82-7 C5H3ClN2O2
2,6-Difluoropyridine 2,6-Difluoropyridine 1513-65-1 C5H3F2N
2-Amino-4,6-dichloropyridine 2-Amino-4,6-dichloropyridine 116632-24-7 C5H4Cl2N2
3-ACETYL-5-BROMOPYRIDINE 3-ACETYL-5-BROMOPYRIDINE 38940-62-4 C7H6BrNO
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