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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
5-Hydroxy-pyridine-3-carbaldehyde 5-Hydroxy-pyridine-3-carbaldehyde 1060804-48-9 C6H5NO2
3-bromo-2-iodo-4-methyl-5-nitropyridine 3-bromo-2-iodo-4-methyl-5-nitropyridine 1150618-06-6 C6H4BrIN2O2
methyl 3-bromo-4-methyl-5-nitropicolinate methyl 3-bromo-4-methyl-5-nitropicolinate 1150618-07-7 C8H7BrN2O4
2-AMINO-6-BROMOPYRIDIN-3-OL 2-AMINO-6-BROMOPYRIDIN-3-OL 934758-27-7 C5H5BrN2O
Pyridine, 2-chloro-5-iodo-4-methyl- Pyridine, 2-chloro-5-iodo-4-methyl- 550347-54-1 C6H5ClIN
2,5-DIHYDROXYPYRIDINE 2,5-DIHYDROXYPYRIDINE 24154-26-5 C5H5NO2
2-AMINO-5-NITROPYRIDINE 2-AMINO-5-NITROPYRIDINE 67476-67-9 C5H5N3O2
3-HYDROXY-2,6-DI(HYDROXYMETHYL)PYRRIDINE HYDROCHLORIDE 3-HYDROXY-2,6-DI(HYDROXYMETHYL)PYRRIDINE HYDROCHLORIDE 14187-25-8 C7H10ClNO3
(3-CHLORO-PYRIDIN-2-YL)-METHYLAMINE DIHYDROCHLORIDE (3-CHLORO-PYRIDIN-2-YL)-METHYLAMINE DIHYDROCHLORIDE 342816-31-3 C6H8Cl2N2
4',4''''-(1,4-PHENYLENE)BIS(2,2':6',2''-TERPYRIDINE) 4',4''''-(1,4-PHENYLENE)BIS(2,2':6',2''-TERPYRIDINE) 146406-75-9 C36H24N6
4-IODONICOTINIC ACID 4-IODONICOTINIC ACID 15366-63-9 C6H4INO2
4-[4-(4-Fluorophenyl)-1-(3-phenylpropyl)-5-(4-pyridinyl)-1H-imidazol-2-yl]-3-butyn-1-ol 4-[4-(4-Fluorophenyl)-1-(3-phenylpropyl)-5-(4-pyridinyl)-1H-imidazol-2-yl]-3-butyn-1-ol 215303-72-3 C27H24FN3O
3,5-dichloro-4-methyl-pyridin-2-ol 3,5-dichloro-4-methyl-pyridin-2-ol 58236-72-9 C6H5Cl2NO
(3-Chlorophenyl)-(1H-pyrazolo[4,3-b]pyridin-3-yl)aMine (3-Chlorophenyl)-(1H-pyrazolo[4,3-b]pyridin-3-yl)aMine 1041614-20-3 C12H9ClN4
1-BENZYL-5,6-DIHYDROPYRIDIN-2(1H)-ONE 1-BENZYL-5,6-DIHYDROPYRIDIN-2(1H)-ONE 128773-72-8 C12H13NO
3-(2-CHLORO-PYRIDIN-3-YL)-ACRYLIC ACID 3-(2-CHLORO-PYRIDIN-3-YL)-ACRYLIC ACID C8H6ClNO2
2,6-DIMETHOXYISONICOTINALDEHYDE 2,6-DIMETHOXYISONICOTINALDEHYDE 52606-01-6 C8H9NO3
Pyridine methanesulfonate Pyridine methanesulfonate 39879-60-2 C6H9NO3S
4,4',4''-TRI-TERT-BUTYL-2,2':6',2''-TERPYRIDINE 4,4',4''-TRI-TERT-BUTYL-2,2':6',2''-TERPYRIDINE 115091-29-7 C27H35N3
2,6-DICHLORO-3-HYDROXYPYRIDINE-4-CARBOXYLIC ACID 2,6-DICHLORO-3-HYDROXYPYRIDINE-4-CARBOXYLIC ACID 185422-96-2 C6H3Cl2NO3
(5-BROMOPYRIDIN-2-YL)ACETONITRILE (5-BROMOPYRIDIN-2-YL)ACETONITRILE C7H5BrN2
2-(N-PHENYL-N-ETHYL)AMINOETHYLPYRIDINIU& 2-(N-PHENYL-N-ETHYL)AMINOETHYLPYRIDINIU& 14408-19-6 C15H19ClN2
5-FLUORO-2-HYDROXYNICOTINIC ACID 5-FLUORO-2-HYDROXYNICOTINIC ACID 884494-83-1 C6H4FNO3
3,5-DIBROMO-4-PYRIDINOL 3,5-DIBROMO-4-PYRIDINOL 25813-25-6 C5H3Br2NO
2-(BENZYLMETHYLAMINO)PYRIDINE-5-BORONIC ACID PINACOL ESTER 2-(BENZYLMETHYLAMINO)PYRIDINE-5-BORONIC ACID PINACOL ESTER 1073354-30-9 C19H25BN2O2
2-Chloro-6-(trifluoromethyl)nicotinonitrile 2-Chloro-6-(trifluoromethyl)nicotinonitrile 389117-37-7 C15H15N3O3
ETHYL 2-HYDROXY-4-METHYLNICOTINATE ETHYL 2-HYDROXY-4-METHYLNICOTINATE 243860-78-8 C9H11NO3
1-(5-CHLOROPYRIDIN-2-YL)ETHANONE 1-(5-CHLOROPYRIDIN-2-YL)ETHANONE 94952-46-2 C7H6ClNO
(3-AMINO-5-BROMO-PYRIDIN-2-YL)-ACETIC ACID (3-AMINO-5-BROMO-PYRIDIN-2-YL)-ACETIC ACID 886373-11-1 C7H7BrN2O2
1-(1-BENZYL-1,2,3,6-TETRAHYDRO-PYRIDIN-4-YL)-1,3-DIHYDRO-BENZOIMIDAZOL-2-ONE 1-(1-BENZYL-1,2,3,6-TETRAHYDRO-PYRIDIN-4-YL)-1,3-DIHYDRO-BENZOIMIDAZOL-2-ONE 60373-71-9 C19H19N3O
4,4'-DIHYDROXY-2,2'-BIPYRIDINE 4,4'-DIHYDROXY-2,2'-BIPYRIDINE 90770-88-0 C10H8N2O2
N-BENZYL-4-(BENZYLAMINO)PICOLINAMIDE N-BENZYL-4-(BENZYLAMINO)PICOLINAMIDE 913836-29-0 C20H19N3O
4-Chloropyridine-3-carboxamide 4-Chloropyridine-3-carboxamide 7418-70-4 C6H5ClN2O
5-Chloropyridine-3-carboxamide 5-Chloropyridine-3-carboxamide 284040-69-3 C6H5ClN2O
3-CHLORO-2-HYDRAZINO-5-NITROPYRIDINE 3-CHLORO-2-HYDRAZINO-5-NITROPYRIDINE 22353-43-1 C5H5ClN4O2
5-Bromo-2-chloropyridine  N-oxide 5-Bromo-2-chloropyridine N-oxide 889865-43-4 C5H3BrClNO
[2,2'-Bipyridine]-6,6'(1H,1'H)-dione [2,2'-Bipyridine]-6,6'(1H,1'H)-dione 103505-54-0 C10H8N2O2
[(3-Aminopyridin-2-yl)methylideneamino]thiourea [(3-Aminopyridin-2-yl)methylideneamino]thiourea 236392-56-6 C7H9N5S
5-Bromo-N-ethylnicotinamide 5-Bromo-N-ethylnicotinamide 173999-48-9 C8H9BrN2O
5-(2-bromoethyl)-2-methylpyridine 5-(2-bromoethyl)-2-methylpyridine 1147893-28-4 C8H10BrN
2-[3-[N-(4-tert-Butylbenzyl)-N-(pyridin-3-ylsulfonyl)aminomethyl]phenoxy]acetic acid 2-[3-[N-(4-tert-Butylbenzyl)-N-(pyridin-3-ylsulfonyl)aminomethyl]phenoxy]acetic acid 223488-57-1 C25H28N2O5S
1-[Tris(1-methylethyl)silyl]-1H-pyrrolo[2,3-b]pyridine-4-carbonitrile 1-[Tris(1-methylethyl)silyl]-1H-pyrrolo[2,3-b]pyridine-4-carbonitrile 1092580-01-2 C17H25N3Si
Methyl 6-Cyanopyridine-3-carboxylate Methyl 6-Cyanopyridine-3-carboxylate 89809-65-4 C8H6N2O2
2-Amino-4,5-dichloro-3-nitropyridine 2-Amino-4,5-dichloro-3-nitropyridine 662116-67-8 C5H3Cl2N3O2
2-Amino-6-bromo-5-nitropyridine 2-Amino-6-bromo-5-nitropyridine 84487-05-8 C5H4BrN3O2
4-bromo-3-fluoropyridine hydrochloride 4-bromo-3-fluoropyridine hydrochloride 1159811-44-5 C5H4BrClFN
2-bromo-3-chloro-5-fluoropyridine 2-bromo-3-chloro-5-fluoropyridine 1214326-94-9 C5H2BrClFN
2-ethylmercapto-5-nitro-pyridine 2-ethylmercapto-5-nitro-pyridine 107756-05-8 C7H8N2O2S
3-AMino-5-broMo-4-Methylpyridine 3-AMino-5-broMo-4-Methylpyridine 850892-12-5 C6H7BrN2
Methyl2-aMino-5-nitronicotinate Methyl2-aMino-5-nitronicotinate 88312-64-5 C7H7N3O4
2-BROMO-5-METHOXYPYRIDINE-4-BORONIC ACID 2-BROMO-5-METHOXYPYRIDINE-4-BORONIC ACID 1072952-48-7 C6H7BBrNO3
6-CHLOROPYRIDINE-3-SULFONIC ACID 6-CHLOROPYRIDINE-3-SULFONIC ACID 17624-08-7 C5H4ClNO3S
3-METHYL-4-ETHYL PYRIDINE 3-METHYL-4-ETHYL PYRIDINE 20815-29-6 C8H11N
2-ETHOXY-4-(N,N-DIISOPROPYL)AMINOPYRIDINE 2-ETHOXY-4-(N,N-DIISOPROPYL)AMINOPYRIDINE 200064-23-9 C13H22N2O
2-TERT-BUTOXY-6-CHLOROPYRIDINE 2-TERT-BUTOXY-6-CHLOROPYRIDINE 547740-43-2 C9H12ClNO
6-(DI-BOC-AMINO)-2-BROMOPYRIDINE 6-(DI-BOC-AMINO)-2-BROMOPYRIDINE 870703-61-0 C15H21BrN2O4
2,6-Dimethoxyhydroquinone 2,6-Dimethoxyhydroquinone 15233-65-5 C8H10O4
Pyridine, 5-bromo-2-(chloromethyl)- (9CI) Pyridine, 5-bromo-2-(chloromethyl)- (9CI) 168823-76-5 C6H5BrClN
Pyridine, 2-(chloromethyl)-5-methyl- (6CI,7CI,8CI,9CI) Pyridine, 2-(chloromethyl)-5-methyl- (6CI,7CI,8CI,9CI) 767-01-1 C7H8ClN
N,N-dimethyl-pyrimidine-2,5-diamine N,N-dimethyl-pyrimidine-2,5-diamine 56621-99-9 C6H10N4
2-AMINO-3-CHLORO-5-HYDROXYPYRIDINE 2-AMINO-3-CHLORO-5-HYDROXYPYRIDINE 209328-70-1 C5H5ClN2O
2-Chloro-N-methyl-isonicotinamide 2-Chloro-N-methyl-isonicotinamide 131418-11-6 C7H7ClN2O
3-Nitropyridine-2-Carbaldehyde 3-Nitropyridine-2-Carbaldehyde 10261-94-6 C6H4N2O3
tert-Butyl 4-[(Trimethylsilanyl)oxy]-3,6-dihydro-2H-pyridine-1-carboxylate tert-Butyl 4-[(Trimethylsilanyl)oxy]-3,6-dihydro-2H-pyridine-1-carboxylate 211108-48-4 C13H25NO3Si
PYRIDINE-3,4-DICARBONITRILE PYRIDINE-3,4-DICARBONITRILE 1633-44-9 C7H3N3
6-(4-fluorophenyl)pyridine-2-carbaldehyde 6-(4-fluorophenyl)pyridine-2-carbaldehyde 157402-44-3 C12H9NO
2-Hydroxy-4-Chloropyridine 2-Hydroxy-4-Chloropyridine C5H4ClNO
1,8-Naphthyridine,1,2,3,4-tetrahydro-7-methyl-(9CI) 1,8-Naphthyridine,1,2,3,4-tetrahydro-7-methyl-(9CI) 274676-47-0 C9H12N2
5-Chloro-2-ethoxy-3-nitropyridine 5-Chloro-2-ethoxy-3-nitropyridine 886373-32-6 C7H7ClN2O3
2,6-diethylpyridine 2,6-diethylpyridine 935-28-4 C9H13N
2-Chloro-3-hydroxy-6-iodopyridine 2-Chloro-3-hydroxy-6-iodopyridine 185220-68-2 C5H3ClINO
3-Bromo-2,6-difluoropyridine 3-Bromo-2,6-difluoropyridine 80392-79-6 C5H2BrF2N
2-HYDROXY-4,6-DIMETHYLNICOTINIC ACID 2-HYDROXY-4,6-DIMETHYLNICOTINIC ACID 24667-09-2 C8H9NO3
2,2'-bipyridine-4-carboxylic acid 2,2'-bipyridine-4-carboxylic acid 1748-89-6 C11H8N2O2
(3,5-difluoropyridin-2-yl)methanamine (3,5-difluoropyridin-2-yl)methanamine 771574-56-2 C6H6F2N2
N-[(1S,2S)-3-(4-Chlorophenyl)-2-(3-cyanophenyl)-1-methylpropyl]-2-methyl-2-[(5-(trifluoromethyl)pyridin-2-yl)oxy]propanamide( MK 0364) N-[(1S,2S)-3-(4-Chlorophenyl)-2-(3-cyanophenyl)-1-methylpropyl]-2-methyl-2-[(5-(trifluoromethyl)pyridin-2-yl)oxy]propanamide( MK 0364) 701977-09-5 C27H25ClF3N3O2
2(1H)-Pyridinone, 5-nitro-6-(trifluoromethyl)- 2(1H)-Pyridinone, 5-nitro-6-(trifluoromethyl)- 117519-19-4 C6H3F3N2O3
4-Morpholin-4-ylpyridin-2-amine 4-Morpholin-4-ylpyridin-2-amine 722549-98-6 C9H13N3O
5-chloro-6-fluoronicotinic acid 5-chloro-6-fluoronicotinic acid 38185-57-8 C6H3ClFNO2
2-(CYCLOPENTYLOXY)-3-IODOPYRIDINE 2-(CYCLOPENTYLOXY)-3-IODOPYRIDINE 902837-47-2 C10H12INO
3-BROMO-2-NITROPYRIDINE N-OXIDE 3-BROMO-2-NITROPYRIDINE N-OXIDE C5H3BrN2O3
ETHYL 2-AMINO-3-BROMO-5-PYRIDINECARBOXYLATE ETHYL 2-AMINO-3-BROMO-5-PYRIDINECARBOXYLATE 850429-51-5 C8H9BrN2O2
2-CHLORO-5-FLUORO-6-FORMYLPYRIDINE 2-CHLORO-5-FLUORO-6-FORMYLPYRIDINE 884494-77-3 C6H3ClFNO
2-METHYLAMINO-3-NITRO-5-(TRIFLUOROMETHYL)PYRIDINE 2-METHYLAMINO-3-NITRO-5-(TRIFLUOROMETHYL)PYRIDINE 175277-21-1 C7H6F3N3O2
1-HEXYLPYRIDINIUM HEXAFLUOROPHOSPHATE 1-HEXYLPYRIDINIUM HEXAFLUOROPHOSPHATE 797789-00-5 C11H18F6NP
2-IODO-5-HYDROXYPYRIDINE 2-IODO-5-HYDROXYPYRIDINE C5H4INO
2-CHLORO-4-METHYL-6,7-DIHYDRO-5H-CYCLOPENTA[B]PYRIDINE 2-CHLORO-4-METHYL-6,7-DIHYDRO-5H-CYCLOPENTA[B]PYRIDINE 83939-58-6 C8H9ClN2
4-METHOXY-PYRIDINE-2-CARBOXYLIC ACID AMIDE 4-METHOXY-PYRIDINE-2-CARBOXYLIC ACID AMIDE 90151-10-3 C7H8N2O2
5-BROMO-2-METHYL-3-NITROPYRIDINE 5-BROMO-2-METHYL-3-NITROPYRIDINE C6H5BrN2O2
2-Fluoroisoniazide 2-Fluoroisoniazide 369-24-4 C6H6FN3O
3,5-DIIODOPYRIDINE-4-CARBONITRILE 3,5-DIIODOPYRIDINE-4-CARBONITRILE 827616-50-2 C6H2I2N2
2,4-Dichloro-3-nitropyridine 2,4-Dichloro-3-nitropyridine C5H2Cl2N2O2
2,3-DIFLUORO-5-NITROPYRIDINE 2,3-DIFLUORO-5-NITROPYRIDINE 954219-68-2 C5H2F2N2O2
2-Chloro-3-pyridineacetic acid 2-Chloro-3-pyridineacetic acid 61494-55-1 C7H6ClNO2
N-(5-Amino-3-bromopyridin-2-yl)acetamide N-(5-Amino-3-bromopyridin-2-yl)acetamide 896161-09-4 C7H8BrN3O
1-BENZYL-4-HYDROXY-5-AZAINDOLE 1-BENZYL-4-HYDROXY-5-AZAINDOLE 26956-47-8 C14H12N2O
2-CHLORO-5-METHYL-4-NITROPYRIDINE-N-OXIDE 2-CHLORO-5-METHYL-4-NITROPYRIDINE-N-OXIDE 60323-96-8 C6H5ClN2O3
6-chloro-5-iodonicotinic acid 6-chloro-5-iodonicotinic acid 59782-87-5 C6H3ClINO2
(5-nitropyridin-2-yl)hydrazine (5-nitropyridin-2-yl)hydrazine 6343-98-2 C5H6N4O2
5-Fluoro-2-methoxy-3-methylpyridine 5-Fluoro-2-methoxy-3-methylpyridine 884494-89-7 C7H8FNO
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