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
1-Hexadecylpyridinium bromide 1-Hexadecylpyridinium bromide 140-72-7 C21H38BrN
4-(Trifluoromethyl)nicotinic acid 4-(Trifluoromethyl)nicotinic acid 158063-66-2 C7H4F3NO2
Pyridine hydrochloride Pyridine hydrochloride 628-13-7 C5H6ClN
2-Hydroxynicotinic acid 2-Hydroxynicotinic acid 609-71-2 C6H5NO3
4,4'-DIBROMO-2,2'-BIPYRIDINE 4,4'-DIBROMO-2,2'-BIPYRIDINE 18511-71-2 C10H6Br2N2
3-Bromo-5-methoxypyridine 3-Bromo-5-methoxypyridine 50720-12-2 C6H6BrNO
Methyl 2-aminopyridine-4-carboxylate Methyl 2-aminopyridine-4-carboxylate 6937-03-7 C7H8N2O2
2-Bromo-6-methoxypyridine 2-Bromo-6-methoxypyridine 40473-07-2 C6H6BrNO
2,6-Pyridinedicarboxylic acid 2,6-Pyridinedicarboxylic acid 499-83-2 C7H5NO4
Isonicotinic acid Isonicotinic acid 55-22-1 C6H5NO2
(2-Chloro-3-pyridinyl)methanol (2-Chloro-3-pyridinyl)methanol 42330-59-6 C6H6ClNO
4-Acetylpyridine 4-Acetylpyridine 1122-54-9 C7H7NO
3,5-Pyridinedicarboxylic acid 3,5-Pyridinedicarboxylic acid 499-81-0 C7H5NO4
5-Bromopyridine-2-carboxylic acid 5-Bromopyridine-2-carboxylic acid 30766-11-1 C6H4BrNO2
2-Methoxy-5-pyridineboronic acid 2-Methoxy-5-pyridineboronic acid 163105-89-3 C6H8BNO3
2-Amino-3-pyridinecarboxaldehyde 2-Amino-3-pyridinecarboxaldehyde 7521-41-7 C6H6N2O
6-Fluoronicotinic acid 6-Fluoronicotinic acid 403-45-2 C6H4FNO2
3-Pyridylacetic acid hydrochloride 3-Pyridylacetic acid hydrochloride 6419-36-9 C7H8ClNO2
Nipecotic acid Nipecotic acid 498-95-3 C6H11NO2
N-Boc-3-pyrrolidinone N-Boc-3-pyrrolidinone 101385-93-7 C9H15NO3
2-Bromopyridine-4-carboxylic acid 2-Bromopyridine-4-carboxylic acid 66572-56-3 C6H4BrNO2
2,6-Dichloro-5-fluoronicotinic acid 2,6-Dichloro-5-fluoronicotinic acid 82671-06-5 C6H2Cl2FNO2
2-(Hydroxymethyl)pyridine 2-(Hydroxymethyl)pyridine 586-98-1 C6H7NO
2-Methoxypyridine 2-Methoxypyridine 1628-89-3 C6H7NO
6-(Trifluoromethyl)nicotinic acid 6-(Trifluoromethyl)nicotinic acid 231291-22-8 C7H4F3NO2
4,4'-Dimethyl-2,2'-bipyridyl 4,4'-Dimethyl-2,2'-bipyridyl 1134-35-6 C12H12N2
5-Chloro-7-azaindole 5-Chloro-7-azaindole 866546-07-8 C7H5ClN2
4-Chloronicotinic acid 4-Chloronicotinic acid 10177-29-4 C6H4ClNO2
2-Chloro-3-pyridinecarboxaldehyde 2-Chloro-3-pyridinecarboxaldehyde 36404-88-3 C6H4ClNO
3-Bromoisonicotinic acid 3-Bromoisonicotinic acid 13959-02-9 C6H4BrNO2
2-Chloro-4-pyridinecarboxylic acid 2-Chloro-4-pyridinecarboxylic acid 6313-54-8 C6H4ClNO2
2,5-Dichloroisonicotinic acid 2,5-Dichloroisonicotinic acid 88912-26-9 C6H3Cl2NO2
Pyridinium chlorochromate Pyridinium chlorochromate 26299-14-9 C5H6ClCrNO3
2-Fluoronicotinic acid 2-Fluoronicotinic acid 393-55-5 C6H4FNO2
6-Bromopicolinic acid 6-Bromopicolinic acid 21190-87-4 C6H4BrNO2
1-Methylpiperidin-4-amine 1-Methylpiperidin-4-amine 41838-46-4 C6H14N2
2-Hydroxy-5-pyridinecarboxylic acid 2-Hydroxy-5-pyridinecarboxylic acid 5006-66-6 C6H5NO3
2,2'-Bipyridine-4,4'-dicarboxylic acid 2,2'-Bipyridine-4,4'-dicarboxylic acid 6813-38-3 C12H8N2O4
5,6-Dichloronicotinic acid 5,6-Dichloronicotinic acid 41667-95-2 C6H3Cl2NO2
2-Bromopyridine-5-carbaldehyde 2-Bromopyridine-5-carbaldehyde 149806-06-4 C6H4BrNO
5-Fluoronicotinic acid 5-Fluoronicotinic acid 402-66-4 C6H4FNO2
2-Chloro-6-methoxypyridine 2-Chloro-6-methoxypyridine 17228-64-7 C6H6ClNO
2,5-PYRIDINEDICARBOXYLIC ACID 2,5-PYRIDINEDICARBOXYLIC ACID 100-26-5 C7H5NO4
N-Methyl-4-chloropyridine-2-carboxamide N-Methyl-4-chloropyridine-2-carboxamide 220000-87-3 C7H7ClN2O
2,6-Pyridinedimethanol 2,6-Pyridinedimethanol 1195-59-1 C7H9NO2
Ethyl picolinate Ethyl picolinate 2524-52-9 C8H9NO2
1,8-Diazabicyclo[5.4.0]undec-7-ene 1,8-Diazabicyclo[5.4.0]undec-7-ene 6674-22-2 C9H16N2
Methyl 6-aminonicotinate Methyl 6-aminonicotinate 36052-24-1 C7H8N2O2
Cyclopenta[b]pyridine Cyclopenta[b]pyridine 533-37-9 C8H9N
5-Bromo-7-azaindole 5-Bromo-7-azaindole 183208-35-7 C7H5BrN2
3,4-Pyridinedicarboxylic acid 3,4-Pyridinedicarboxylic acid 490-11-9 C7H5NO4
4-Chloropyridine-2-carboxylic acid 4-Chloropyridine-2-carboxylic acid 5470-22-4 C6H4ClNO2
5-Hydroxynicotinic acid 5-Hydroxynicotinic acid 27828-71-3 C6H5NO3
5-Bromo-2-methoxypyridine 5-Bromo-2-methoxypyridine 13472-85-0 C6H6BrNO
6-Bromonicotinic acid 6-Bromonicotinic acid 6311-35-9 C6H4BrNO2
2-Picolinic acid 2-Picolinic acid 98-98-6 C6H5NO2
2-Fluoroisonicotinic acid 2-Fluoroisonicotinic acid 402-65-3 C6H4FNO2
5-Pyrimidinylboronic acid 5-Pyrimidinylboronic acid 109299-78-7 C4H5BN2O2
5-Bromopyridine-2-carbaldehyde 5-Bromopyridine-2-carbaldehyde 31181-90-5 C6H4BrNO
6-CHLORO-1H-PYRROLO[2,3-B]PYRIDINE 6-CHLORO-1H-PYRROLO[2,3-B]PYRIDINE 55052-27-2 C7H5ClN2
4-Methoxypyridine 4-Methoxypyridine 620-08-6 C6H7NO
2-Methoxy-5-nitropyridine 2-Methoxy-5-nitropyridine 5446-92-4 C6H6N2O3
1-(4-Pyridyl)piperazine 1-(4-Pyridyl)piperazine 1008-91-9 C9H13N3
3-Pyridylboronic acid 3-Pyridylboronic acid 1692-25-7 C5H6BNO2
4-N-BOC-Aminopiperidine 4-N-BOC-Aminopiperidine 73874-95-0 C10H20N2O2
2-Bromonicotinic acid 2-Bromonicotinic acid 35905-85-2 C6H4BrNO2
ETHYL 2,4-DICHLORO-6-METHYLPYRIDINE-3-CARBOXYLATE ETHYL 2,4-DICHLORO-6-METHYLPYRIDINE-3-CARBOXYLATE 86129-63-7 C9H9Cl2NO2
5-Bromo-3-nitro-2-pyridinol 5-Bromo-3-nitro-2-pyridinol 15862-34-7 C5H3BrN2O3
2,3-DIBROMO-5-NITRO PYRIDINE 2,3-DIBROMO-5-NITRO PYRIDINE 15862-36-9 C5H2Br2N2O2
1-Ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitrile 1-Ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitrile 28141-13-1 C9H10N2O2
Pyridine hydrofluoride Pyridine hydrofluoride 32001-55-1 C5H6FN
6-(TRIFLUOROMETHYL)PYRIDINE-3-CARBOXALDEHYDE 6-(TRIFLUOROMETHYL)PYRIDINE-3-CARBOXALDEHYDE 386704-12-7 C7H4F3NO
5-Amino-2-methoxypyridine 5-Amino-2-methoxypyridine 6628-77-9 C6H8N2O
2-Chloro-6-iodopyridine 2-Chloro-6-iodopyridine 258506-66-0 C5H3ClIN
2-Fluoro-5-trifluoromethylpyridine 2-Fluoro-5-trifluoromethylpyridine 69045-82-5 C6H3F4N
2-Fluoro-3,5-dichloropyridine 2-Fluoro-3,5-dichloropyridine 823-56-3 C5H2Cl2FN
3-Amino-2-pyridinol 3-Amino-2-pyridinol 33630-99-8 C5H6N2O
2-Chloro-3-fluoro-5-methylpyridine 2-Chloro-3-fluoro-5-methylpyridine 34552-15-3 C6H5ClFN
2-Bromo-5-fluoropyridine 2-Bromo-5-fluoropyridine 41404-58-4 C5H3BrFN
2,5-DIBROMO-3-FLUOROPYRIDINE 2,5-DIBROMO-3-FLUOROPYRIDINE 156772-60-0 C5H2Br2FN
2,5-Dichloropyridin-3-amine 2,5-Dichloropyridin-3-amine 78607-32-6 C5H4Cl2N2
2-Fluoropyridine-4-carboxaldehyde 2-Fluoropyridine-4-carboxaldehyde 131747-69-8 C6H4FNO
3-Fluoro-5-methylpyridine 3-Fluoro-5-methylpyridine 407-21-6 C6H6FN
3-AMINO-2,6-DIMETHYLPYRIDINE 3-AMINO-2,6-DIMETHYLPYRIDINE 3430-33-9 C7H10N2
2-FLUORO-5-HYDROXYPYRIDINE 2-FLUORO-5-HYDROXYPYRIDINE 55758-32-2 C5H4FNO
Methyl 6-methylnicotinate Methyl 6-methylnicotinate 5470-70-2 C8H9NO2
2-Chloro-4-nitropyridine 1-oxide 2-Chloro-4-nitropyridine 1-oxide 14432-16-7 C5H3ClN2O3
2-Bromo-4-nitropyridine 1-oxide 2-Bromo-4-nitropyridine 1-oxide 52092-43-0 C5H3BrN2O3
2-Hydroxynicotinaldehyde 2-Hydroxynicotinaldehyde 36404-89-4 C6H5NO2
2-Chloro-4-iodopyridine 2-Chloro-4-iodopyridine 153034-86-7 C5H3ClIN
3-Fluoro-4-nitropyridine 3-Fluoro-4-nitropyridine 13505-01-6 C5H3FN2O2
METHYL 2-CHLOROISONICOTINATE METHYL 2-CHLOROISONICOTINATE 58481-11-1 C7H6ClNO2
4-Bromo-3-cyanopyridine 4-Bromo-3-cyanopyridine 154237-70-4 C6H3BrN2
2-Ethylpyridine 2-Ethylpyridine 100-71-0 C7H9N
2-Chloropyridine 2-Chloropyridine 109-09-1 C5H4ClN
4-Dimethylaminopyridine 4-Dimethylaminopyridine 1122-58-3 C7H10N2
3-Methyl-4-nitropyridine 3-Methyl-4-nitropyridine 1678-53-1 C6H6N2O2
4-Aminopyridine 4-Aminopyridine 504-24-5 C5H6N2
3,4-Lutidine 3,4-Lutidine 583-58-4 C7H9N
4-Methylpyridin-2-amine 4-Methylpyridin-2-amine 695-34-1 C6H8N2
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