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
6-Methyl-2-pyridinecarboxaldehyde 6-Methyl-2-pyridinecarboxaldehyde 1122-72-1 C7H7NO
2-Bromo-3-fluoropyridine 2-Bromo-3-fluoropyridine 40273-45-8 C5H3BrFN
2,6-Dibromopyridine 2,6-Dibromopyridine 626-05-1 C5H3Br2N
2-Amino-3-nitropyridine 2-Amino-3-nitropyridine 4214-75-9 C5H5N3O2
5-BROMO-2-METHOXY-NICOTINIC ACID 5-BROMO-2-METHOXY-NICOTINIC ACID 54916-66-4 C7H6BrNO3
2-Chloro-3-bromo-5-nitropyridine 2-Chloro-3-bromo-5-nitropyridine 5470-17-7 C5H2BrClN2O2
(2-Aminopyridin-3-yl)methanol (2-Aminopyridin-3-yl)methanol 23612-57-9 C6H8N2O
2-Bromo-4-chloropyridine 2-Bromo-4-chloropyridine 22918-01-0 C5H3BrClN
3-Methoxy-2-nitropyridine 3-Methoxy-2-nitropyridine 20265-37-6 C6H6N2O3
4-Cyanopyridinium-1-olate 4-Cyanopyridinium-1-olate 14906-59-3 C6H4N2O
Ethyl 2,6-dichloro-5-fluoro-pyridine-3-acetoacetate Ethyl 2,6-dichloro-5-fluoro-pyridine-3-acetoacetate 96568-04-6 C10H8Cl2FNO3
2-Aminopyridin-4-ol 2-Aminopyridin-4-ol 33631-05-9 C5H6N2O
2-Chloro-6-(trifluoromethyl)pyridine 2-Chloro-6-(trifluoromethyl)pyridine 39890-95-4 C6H3ClF3N
2,6-DIMETHYL-3-HYDROXYPYRIDINE 2,6-DIMETHYL-3-HYDROXYPYRIDINE 1122-43-6 C7H9NO
4-Bromo-2-fluoropyridine 4-Bromo-2-fluoropyridine 128071-98-7 C5H3BrFN
3-Chloro-4-cyanopyridine 3-Chloro-4-cyanopyridine 68325-15-5 C6H3ClN2
6-Amino-2-hydroxypyridine 6-Amino-2-hydroxypyridine 5154-00-7 C5H6N2O
2-Chloro-3-hydroxypyridine 2-Chloro-3-hydroxypyridine 6636-78-8 C5H4ClNO
2,3-Dibromopyridine 2,3-Dibromopyridine 13534-89-9 C5H3Br2N
3-Amino-6-cyanopyridine 3-Amino-6-cyanopyridine 55338-73-3 C6H5N3
2-HYDROXY-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 2-HYDROXY-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 99368-66-8 C6H3F3N2O3
2-Fluoropyridine 2-Fluoropyridine 372-48-5 C5H4FN
2,6-Dibromo-3-nitropyridine 2,6-Dibromo-3-nitropyridine 55304-80-8 C5H2Br2N2O2
1-(5-Nitropyridin-2-yl)piperazine 1-(5-Nitropyridin-2-yl)piperazine 82205-58-1 C9H12N4O2
3,5-DICHLOROISONICOTINIC ACID 3,5-DICHLOROISONICOTINIC ACID 13958-93-5 C6H3Cl2NO2
4-Methoxy-3-nitropyridine 4-Methoxy-3-nitropyridine 31872-62-5 C6H6N2O3
4-Chloro-2-picoline 4-Chloro-2-picoline 3678-63-5 C6H6ClN
3-BROMO-4-NITROPYRIDINE N-OXIDE 3-BROMO-4-NITROPYRIDINE N-OXIDE 1678-49-5 C5H3BrN2O3
2-Chloro-6-methylpyridine-4-carboxylic acid 2-Chloro-6-methylpyridine-4-carboxylic acid 25462-85-5 C7H6ClNO2
2-Chloro-3-fluoropyridine 2-Chloro-3-fluoropyridine 17282-04-1 C5H3ClFN
2-AMINO-5-CHLORO-3-IODOPYRIDINE 2-AMINO-5-CHLORO-3-IODOPYRIDINE 211308-81-5 C5H4ClIN2
2-CHLORO-5-FLUORO-3-NITROPYRIDINE 2-CHLORO-5-FLUORO-3-NITROPYRIDINE 136888-21-6 C5H2ClFN2O2
1-(6-METHYL-PYRIDIN-2-YL)-ETHANONE 1-(6-METHYL-PYRIDIN-2-YL)-ETHANONE 6940-57-4 C8H9NO
5-Bromo-2-nitropyridine 5-Bromo-2-nitropyridine 39856-50-3 C5H3BrN2O2
3-Bromo-2-chloro-5-(trifluoromethyl)pyridine 3-Bromo-2-chloro-5-(trifluoromethyl)pyridine 71701-92-3 C6H2BrClF3N
6-METHOXYPYRIDINE-2-CARBOXYLIC ACID 6-METHOXYPYRIDINE-2-CARBOXYLIC ACID 26893-73-2 C7H7NO3
2-CHLOROISONICOTINAMIDE 2-CHLOROISONICOTINAMIDE 100859-84-5 C6H5ClN2O
2-Methoxy-6-(methylamino)pyridine 2-Methoxy-6-(methylamino)pyridine 88569-83-9 C7H10N2O
3-FLUOROPYRIDINE-2-CARBOXYLIC ACID 3-FLUOROPYRIDINE-2-CARBOXYLIC ACID 152126-31-3 C6H4FNO2
PYRIDINE-2,4-DIAMINE PYRIDINE-2,4-DIAMINE 461-88-1 C5H7N3
Methyl 5-bromo-2-chloropyridine-3-carboxylate Methyl 5-bromo-2-chloropyridine-3-carboxylate 78686-79-0 C7H5BrClNO2
2,4-Dibromopyridine 2,4-Dibromopyridine 58530-53-3 C5H3Br2N
3-Bromo-2,6-dimethylpyridine 3-Bromo-2,6-dimethylpyridine 3430-31-7 C7H8BrN
2-CHLORO-6-FLUOROPYRIDINE 2-CHLORO-6-FLUOROPYRIDINE 20885-12-5 C5H3ClFN
2-Nitro-3-pyridinamine 2-Nitro-3-pyridinamine 13269-19-7 C5H5N3O2
2-AMINO-3-NITRO-5-PICOLINE 2-AMINO-3-NITRO-5-PICOLINE 7598-26-7 C6H7N3O2
3-Amino-4-chloropyridine 3-Amino-4-chloropyridine 20511-15-3 C5H5ClN2
3-Chloro-2,4,5,6-tetrafluoropyridine 3-Chloro-2,4,5,6-tetrafluoropyridine 1735-84-8 C5ClF4N
3-Hydroxy-2-pyridinemethanol hydrochloride 3-Hydroxy-2-pyridinemethanol hydrochloride 14173-30-9 C6H8ClNO2
2-Chloro-4-iodopyridine-3-carboxaldehyde 2-Chloro-4-iodopyridine-3-carboxaldehyde 153034-90-3 C6H3ClINO
2,3-Diamino-6-methoxypyridine dihydrochloride 2,3-Diamino-6-methoxypyridine dihydrochloride 94166-62-8 C6H11Cl2N3O
Chelidamic acid Chelidamic acid 138-60-3 C7H5NO5
Methyl 4-chloropicolinate Methyl 4-chloropicolinate 24484-93-3 C7H6ClNO2
3-CHLORO-4-METHYLPYRIDINE 3-CHLORO-4-METHYLPYRIDINE 72093-04-0 C6H6ClN
3-Bromo-5-(trifluoromethyl)pyridine 3-Bromo-5-(trifluoromethyl)pyridine 436799-33-6 C6H3BrF3N
4-Amino-3,5-dichloropyridine 4-Amino-3,5-dichloropyridine 22889-78-7 C5H4Cl2N2
3-METHYL-2-PYRIDINECARBOXALDEHYDE 3-METHYL-2-PYRIDINECARBOXALDEHYDE 55589-47-4 C7H7NO
6-Chloropicolinic acid 6-Chloropicolinic acid 4684-94-0 C6H4ClNO2
3-METHYL-4-HYDROXYPYRIDINE 3-METHYL-4-HYDROXYPYRIDINE 22280-02-0 C6H7NO
5-Chloro-2-fluoro-3-methylpyridine 5-Chloro-2-fluoro-3-methylpyridine 375368-84-6 C6H5ClFN
3-Cyano-2-fluoropyridine 3-Cyano-2-fluoropyridine 3939-13-7 C6H3FN2
3-CYANO-6-HYDROXYPYRIDINE 3-CYANO-6-HYDROXYPYRIDINE 94805-52-4 C6H4N2O
1-(5-BROMO-PYRIDIN-2-YL)-ETHANONE 1-(5-BROMO-PYRIDIN-2-YL)-ETHANONE 214701-49-2 C7H6BrNO
2-Bromo-6-hydroxypyridine 2-Bromo-6-hydroxypyridine 27992-32-1 C5H4BrNO
4-Amino-3,5-dichloro-2,6-difluoropyridine 4-Amino-3,5-dichloro-2,6-difluoropyridine 2840-00-8 C5H2Cl2F2N2
4-Chloro-3-cyanopyridine 4-Chloro-3-cyanopyridine 89284-61-7 C6H3ClN2
2,3,5-Collidine 2,3,5-Collidine 695-98-7 C8H11N
6-Methoxypyridine-2-carbaldehyde 6-Methoxypyridine-2-carbaldehyde 54221-96-4 C7H7NO2
1,5-NAPHTHYRIDINE 1,5-NAPHTHYRIDINE 254-79-5 C8H6N2
4-AMINO-PYRIDIN-2-OL 4-AMINO-PYRIDIN-2-OL 38767-72-5 C5H6N2O
2-Chloro-3-bromo-5-methylpyridine 2-Chloro-3-bromo-5-methylpyridine 17282-03-0 C6H5BrClN
2-IODO-3-HYDROXYPYRIDINE 2-IODO-3-HYDROXYPYRIDINE 40263-57-8 C5H4INO
4-Methylpyridine-3-boronic acid 4-Methylpyridine-3-boronic acid 148546-82-1 C6H8BNO2
3,5-Dibromopyridine 3,5-Dibromopyridine 625-92-3 C5H3Br2N
3-Cyano-4-methylpyridine 3-Cyano-4-methylpyridine 5444-01-9 C7H6N2
2-Bromo-3-trifluoromethylpyridine 2-Bromo-3-trifluoromethylpyridine 175205-82-0 C6H3BrF3N
2-AMINO-3,5-DIBROMO-6-METHYLPYRIDINE 2-AMINO-3,5-DIBROMO-6-METHYLPYRIDINE 91872-10-5 C6H6Br2N2
2-Amino-3-fluoropyridine 2-Amino-3-fluoropyridine 21717-95-3 C5H5FN2
2-Chloro-5-acetylpyridine 2-Chloro-5-acetylpyridine 55676-22-7 C7H6ClNO
3-Hydroxy-2-methylpyridine 3-Hydroxy-2-methylpyridine 1121-25-1 C6H7NO
2-Amino-3,5-dibromo-4-methylpyridine 2-Amino-3,5-dibromo-4-methylpyridine 3430-29-3 C6H6Br2N2
2,6-Dichloropyridine 2,6-Dichloropyridine 2402-78-0 C5H3Cl2N
3,5-Dimethyl-2-hydroxymethyl-4-nitropyridine 3,5-Dimethyl-2-hydroxymethyl-4-nitropyridine 149082-03-1 C8H10N2O3
2-Chloro-3-picoline 2-Chloro-3-picoline 18368-76-8 C6H6ClN
1-(3-Pyridyl)-3-(dimethylamino)-2-propen-1-one 1-(3-Pyridyl)-3-(dimethylamino)-2-propen-1-one 55314-16-4 C10H12N2O
2,2':6',2''-TERPYRIDINE 2,2':6',2''-TERPYRIDINE 1148-79-4 C15H11N3
2-Chloropyridine-5-sulfonyl chloride 2-Chloropyridine-5-sulfonyl chloride 6684-39-5 C5H3Cl2NO2S
6-AMINOPICOLINIC ACID METHYL ESTER 6-AMINOPICOLINIC ACID METHYL ESTER 36052-26-3 C7H8N2O2
2-Methoxy-4-methylpyridine 2-Methoxy-4-methylpyridine 100848-70-2 C7H9NO
4-(Trifluoromethyl)pyridine 4-(Trifluoromethyl)pyridine 3796-24-5 C6H4F3N
Pyridinium tribromide Pyridinium tribromide 39416-48-3 C5H6Br3N-2
4-Chloro-3-methylpyridine hydrochloride 4-Chloro-3-methylpyridine hydrochloride 19524-08-4 C6H7Cl2N
2-Cyano-5-hydroxypyridine 2-Cyano-5-hydroxypyridine 86869-14-9 C6H4N2O
2-Cyano-3-fluoropyridine 2-Cyano-3-fluoropyridine 97509-75-6 C6H3FN2
3-FLUORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 3-FLUORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 458532-88-2 C11H15BFNO2
2,5-Dibromo-3-nitropyridine 2,5-Dibromo-3-nitropyridine 15862-37-0 C5H2Br2N2O2
Methyl 4,6-dichloronicotinate Methyl 4,6-dichloronicotinate 65973-52-6 C7H5Cl2NO2
4-Bromo-2-pyridinemethanol 4-Bromo-2-pyridinemethanol 131747-45-0 C6H6BrNO
2,4-DICHLORO-3-AMINOPYRIDINE 2,4-DICHLORO-3-AMINOPYRIDINE 173772-63-9 C5H4Cl2N2
4-Picoline-N-oxide 4-Picoline-N-oxide 1003-67-4 C6H7NO
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