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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
1-(4-CHLORO-PYRIDIN-2-YL)-PIPERAZINE 1-(4-CHLORO-PYRIDIN-2-YL)-PIPERAZINE 885277-30-5 C9H12ClN3
4-[(4-CHLORO-2-PYRIMIDINYL)AMINO]BENZONITRILE 4-[(4-CHLORO-2-PYRIMIDINYL)AMINO]BENZONITRILE 244768-32-9 C11H7ClN4
5-CHLORO-2-METHYL-NICOTINIC ACID METHYL ESTER 5-CHLORO-2-METHYL-NICOTINIC ACID METHYL ESTER 350597-49-8 C8H8ClNO2
3,4-DIMETHOXY-2-METHYLPYRIDINE N-OXIDE 3,4-DIMETHOXY-2-METHYLPYRIDINE N-OXIDE 72830-07-0 C8H11NO3
3-Hydroxypyridine sodium salt 3-Hydroxypyridine sodium salt 52536-09-1 C5H4NNaO
4-AMINO-2-CHLOROPYRIDINE, N-BOC PROTECTED 98 4-AMINO-2-CHLOROPYRIDINE, N-BOC PROTECTED 98 234108-73-7 C10H13ClN2O2
3,6-DIAMINO-2-PICOLINE 3,6-DIAMINO-2-PICOLINE 6992-84-3 C6H9N3
1-[5-(Trifluoromethyl)pyridin-2-yl]piperazine 1-[5-(Trifluoromethyl)pyridin-2-yl]piperazine 132834-58-3 C10H12F3N3
2-Amino-3-acetylpyridine 2-Amino-3-acetylpyridine 65326-33-2 C7H8N2O
2-CHLORO-3-TRICHLOROMETHYLPYRIDINE 2-CHLORO-3-TRICHLOROMETHYLPYRIDINE 72648-12-5 C6H3Cl4N
3-(2-CHLORO-PYRIDIN-3-YL)-ACRYLIC ACID ETHYL ESTER 3-(2-CHLORO-PYRIDIN-3-YL)-ACRYLIC ACID ETHYL ESTER 104830-08-2 C10H10ClNO2
2-Cyanoethylpyridine 2-Cyanoethylpyridine 35549-47-4 C8H8N2
2-HYDROXYMETHYL-3-METHYL-4-NITROPYRIDINE 2-HYDROXYMETHYL-3-METHYL-4-NITROPYRIDINE 168167-49-5 C7H8N2O3
2-AMINO-5-IODO-PYRIDINE-3-CARBALDEHYDE 2-AMINO-5-IODO-PYRIDINE-3-CARBALDEHYDE 578007-67-7 C6H5IN2O
2-(6-Chloropyridin-3-yl)acetic acid 2-(6-Chloropyridin-3-yl)acetic acid 39891-13-9 C7H6ClNO2
4,5-DIAMINO-6-HYDROXYPYRIMIDINE SULFATE 4,5-DIAMINO-6-HYDROXYPYRIMIDINE SULFATE 52502-66-6 C4H8N4O5S
2-Bromo-3-methoxy-6-methylpyridine 2-Bromo-3-methoxy-6-methylpyridine 24207-22-5 C7H8BrNO
Methyl 4-chloro-2-pyridinecarboxylate hydrochloride Methyl 4-chloro-2-pyridinecarboxylate hydrochloride 176977-85-8 C7H7Cl2NO2
2-bromo-6-methylpyridin-4-amine 2-bromo-6-methylpyridin-4-amine 79055-59-7 C6H7BrN2
2,2'-DIPYRIDYLAMINE 2,2'-DIPYRIDYLAMINE 1202-34-2 C10H9N3
GSK1904529A GSK1904529A 1089283-49-7 C44H47F2N9O5S
3-Bromo-4-methyl-5-nitropyridine 3-Bromo-4-methyl-5-nitropyridine 69872-15-7 C6H5BrN2O2
4-CHLORO-PYRIDINE-2-CARBOXYLIC ACID HYDRAZIDE 4-CHLORO-PYRIDINE-2-CARBOXYLIC ACID HYDRAZIDE 73771-11-6 C6H6ClN3O
2-(TRIFLUOROMETHYL)-PYRIDINE-4-CARBOXALDEHYDE 2-(TRIFLUOROMETHYL)-PYRIDINE-4-CARBOXALDEHYDE 108338-20-1 C7H4F3NO
2-CHLORO-3-BROMO-5- FLUOROYPYRIDINE 2-CHLORO-3-BROMO-5- FLUOROYPYRIDINE C5H2BrClFN
PYRIDINE-3,4-DICARBOXYLIC ANHYDRIDE PYRIDINE-3,4-DICARBOXYLIC ANHYDRIDE 4664-08-8 C7H3NO3
3-AMINO-4-PYRIDINECARBOXAMIDE 3-AMINO-4-PYRIDINECARBOXAMIDE 64188-97-2 C6H7N3O
5-BROMO-2-HYDROXY-3-NITRO-4-PICOLINE 5-BROMO-2-HYDROXY-3-NITRO-4-PICOLINE 228410-90-0 C6H5BrN2O3
N-FLUORO-3,5-DICHLOROPYRIDINIUM TRIFLATE N-FLUORO-3,5-DICHLOROPYRIDINIUM TRIFLATE 107264-06-2 C6H3Cl2F4NO3S
3,5-DIBROMO-1-METHYL-1H-PYRIDIN-2-ONE 3,5-DIBROMO-1-METHYL-1H-PYRIDIN-2-ONE 14529-54-5 C6H5Br2NO
Pyridine-4-carboxylic acid N-oxide Pyridine-4-carboxylic acid N-oxide 13602-12-5 C6H5NO3
PYRIDINIUM M-NITROBENZENESULFONATE PYRIDINIUM M-NITROBENZENESULFONATE 84752-61-4 C11H10N2O5S
4-PYRIDINAMINE, 5-ETHYL-2-METHYL- 4-PYRIDINAMINE, 5-ETHYL-2-METHYL- 5350-64-1 C8H12N2
2-Hydroxy-4-nitropyridine 2-Hydroxy-4-nitropyridine 4487-51-8 C5H4N2O3
2,6-DIMETHYLISONICOTINIC ACID 2,6-DIMETHYLISONICOTINIC ACID 54221-93-1 C8H9NO2
4-PYRIDYLCARBINOL N-OXIDE 4-PYRIDYLCARBINOL N-OXIDE 22346-75-4 C6H7NO2
2-(2-ETHYLHEXYLAMINOMETHYL)PYRIDINE DIHYDROCHLORIDE 2-(2-ETHYLHEXYLAMINOMETHYL)PYRIDINE DIHYDROCHLORIDE 142937-33-5 C14H24N2
3,4-DIBROMO-2-FLUOROPYRIDINE 3,4-DIBROMO-2-FLUOROPYRIDINE 137718-84-4 C5H2Br2FN
5-CHLORO-3-FLUORO-2-METHOXY-PYRIDINE 5-CHLORO-3-FLUORO-2-METHOXY-PYRIDINE 886374-01-2 C6H5ClFNO
4-IODO-PYRIDIN-3-OL 4-IODO-PYRIDIN-3-OL 188057-20-7 C5H4INO
5-BROMO-2-CARBOXY-3-METHYLPYRIDINE 5-BROMO-2-CARBOXY-3-METHYLPYRIDINE 886365-43-1 C7H6BrNO2
2-AMINO-3,4,5-TRICHLOROPYRIDINE 2-AMINO-3,4,5-TRICHLOROPYRIDINE 55933-91-0 C5H3Cl3N2
3-BROMO-2-METHYL-5-NITROPYRIDINE 3-BROMO-2-METHYL-5-NITROPYRIDINE 186593-42-0 C6H5BrN2O2
5-Thien-2-yl-1H-pyrazol-3-amine 5-Thien-2-yl-1H-pyrazol-3-amine 96799-03-0 C7H7N3S
3-(AMINOMETHYL)-2(1H)-PYRIDINONE 3-(AMINOMETHYL)-2(1H)-PYRIDINONE 85468-38-8 C6H9ClN2O
5-Amino-3-Fluoropyridine 5-Amino-3-Fluoropyridine 462652-33-1 C11H8F2N2
Methyl 5-bromo-2-chloroisonicotinate Methyl 5-bromo-2-chloroisonicotinate 886365-28-2 C7H5BrClNO2
6-Bromo-7-methylimidazo[1,2-a]pyridine 6-Bromo-7-methylimidazo[1,2-a]pyridine 116355-18-1 C8H7BrN2
2,3-Dichloropyridine-4-carboxaldehyde 2,3-Dichloropyridine-4-carboxaldehyde 884495-41-4 C6H3Cl2NO
5-Cyanopyridine-2-carboxylic acid 5-Cyanopyridine-2-carboxylic acid 53234-55-2 C7H4N2O2
6-Fluoropyridine-2-boronic acid 6-Fluoropyridine-2-boronic acid 916176-61-9 C5H5BFNO2
1-(3-Hydroxymethylpyridin-2-yl)-4-methyl-2-phenylpiperazine 1-(3-Hydroxymethylpyridin-2-yl)-4-methyl-2-phenylpiperazine 337376-18-8 C17H21N3O
3-(6-Bromopyridin-2-yl)benzoic acid 3-(6-Bromopyridin-2-yl)benzoic acid 914349-44-3 C12H8BrNO2
2-(4-BROMOPHENYL)-6-METHYLIMIDAZO(1,2-A& 2-(4-BROMOPHENYL)-6-METHYLIMIDAZO(1,2-A& 1023-01-4 C14H11BrN2
5-Bromo-2-methoxypyridin-4-ylboronic acid 5-Bromo-2-methoxypyridin-4-ylboronic acid 957060-94-5 C6H7BBrNO3
7-Methoxyimidazo[1,2-a]pyridine-8-carbonitrile 7-Methoxyimidazo[1,2-a]pyridine-8-carbonitrile 834869-04-4 C9H7N3O
1-N-BOC-4-(3-AMINOMETHYLPYRIDYL)PIPERIDINE 1-N-BOC-4-(3-AMINOMETHYLPYRIDYL)PIPERIDINE 883516-43-6 C16H25N3O2
2-Phenyl-nicotinic acid ethyl ester 2-Phenyl-nicotinic acid ethyl ester 144501-28-0 C14H13NO2
4-AMINO-2-METHOXY-3-NITROPYRIDINE 4-AMINO-2-METHOXY-3-NITROPYRIDINE 33623-16-4 C6H7N3O3
2,6-BIS[1-(2-METHYLPHENYLIMINO)ETHYL]PYRIDINE 2,6-BIS[1-(2-METHYLPHENYLIMINO)ETHYL]PYRIDINE 210537-32-9 C23H23N3
3,4-Pyridinediamine,N3-(phenylmethyl)- 3,4-Pyridinediamine,N3-(phenylmethyl)- 75115-28-5 C12H13N3
3-Bromo-2,6-diaminopyridine ,95% 3-Bromo-2,6-diaminopyridine ,95% 54903-86-5 C5H6BrN3
2,6-Dibromo-4-nitropyridine N-oxide 2,6-Dibromo-4-nitropyridine N-oxide 98027-81-7 C5H2Br2N2O3
2-Hydroxynicotinonitrile 2-Hydroxynicotinonitrile 95907-03-2 C6H4N2O
3-Pyridinepropanol 3-Pyridinepropanol 2859-67-8 C8H11NO
3-HYDROXY-2-METHYLPYRIDINE-4-CARBOXALDEHYDE 3-HYDROXY-2-METHYLPYRIDINE-4-CARBOXALDEHYDE 518306-10-0 C7H7NO2
3-IODO-2-(TRIFLUOROMETHYL)PYRIDINE 3-IODO-2-(TRIFLUOROMETHYL)PYRIDINE 590371-71-4 C6H3F3IN
6-TERT-BUTOXYCARBONYLAMINO-PYRIDINE-2-CARBOXYLIC ACID 6-TERT-BUTOXYCARBONYLAMINO-PYRIDINE-2-CARBOXYLIC ACID 258497-21-1 C11H14N2O4
Pyridine, 2-iodo-4-methyl- Pyridine, 2-iodo-4-methyl- 22282-60-6 C6H6IN
2-Bromo-3-[4-(2-(5-ethyl-2-pyridyl)ethoxy)phenyl]propionic acid methyl ester 2-Bromo-3-[4-(2-(5-ethyl-2-pyridyl)ethoxy)phenyl]propionic acid methyl ester 105355-25-7 C19H22BrNO3
2-BOC-AMINO PYRIDINE-5-BORONIC ACID 2-BOC-AMINO PYRIDINE-5-BORONIC ACID 883231-20-7 C10H15BN2O4
2-Bromo-6-(2-methyl-1,3-dioxolan-2-yl)pyridine 2-Bromo-6-(2-methyl-1,3-dioxolan-2-yl)pyridine 49669-14-9 C9H10BrNO2
2-Chlorothieno[2,3-d]pyrimidine 2-Chlorothieno[2,3-d]pyrimidine 83259-30-7 C6H3ClN2S
N-[2-(1H-Indol-3-yl)ethyl]-N'-(4-pyridinyl)-1,4-benzenediamine N-[2-(1H-Indol-3-yl)ethyl]-N'-(4-pyridinyl)-1,4-benzenediamine 881202-45-5 C21H20N4
5-Amino-2-bromo-6-iodopyridine 5-Amino-2-bromo-6-iodopyridine 915006-52-9 C5H4BrIN2
2-(trifluoromethyl)-6-iodopyridine 2-(trifluoromethyl)-6-iodopyridine 100366-74-3 C6H3F3IN
1-(TRIPHENYLMETHYL)PYRIDINIUM TETRAFLUOROBORATE 1-(TRIPHENYLMETHYL)PYRIDINIUM TETRAFLUOROBORATE 26156-84-3 C24H20BF4N
2-Chloro-4-methyl-5-pyridinecarbonitrile 2-Chloro-4-methyl-5-pyridinecarbonitrile 66909-35-1 C7H5ClN2
3,6-Dibromo-2,5-lutidine 3,6-Dibromo-2,5-lutidine 38749-93-8 C7H7Br2N
AS703026 AS703026 1236699-92-5 C15H15FIN3O3
4,6-dichloronicotinaldehyde 4,6-dichloronicotinaldehyde 1060811-62-2 C6H3Cl2NO
5-FORMYLPYRIDINE-3-BORONIC ACID PINACOL ESTER 5-FORMYLPYRIDINE-3-BORONIC ACID PINACOL ESTER 848093-29-8 C12H16BNO3
Ethyl 6-chloroimidazo[1,2-a]pyridine-2-carboxylate Ethyl 6-chloroimidazo[1,2-a]pyridine-2-carboxylate 67625-38-1 C10H9ClN2O2
5-BROMO-2-CHLORO-4-PYRIDINEBORONIC ACID 5-BROMO-2-CHLORO-4-PYRIDINEBORONIC ACID 871329-63-4 C5H4BBrClNO2
6-Bromo-5-methoxypicolinic acid 6-Bromo-5-methoxypicolinic acid 54232-43-8 C7H6BrNO3
5-CHLORO-2-FLUOROPYRIDINE-3-BORONIC ACID 5-CHLORO-2-FLUOROPYRIDINE-3-BORONIC ACID C5H4BClFNO2
2-AMINO-3,5-DIIODOPYRIDINE 2-AMINO-3,5-DIIODOPYRIDINE 23597-15-1 C5H4I2N2
2-METHOXY-3-NITROPYRIDINE-4-CARBOXALDEHYDE 2-METHOXY-3-NITROPYRIDINE-4-CARBOXALDEHYDE 221349-76-4 C7H6N2O4
2-METHYL-4-HYDROXYMETHYLPYRIDINE 2-METHYL-4-HYDROXYMETHYLPYRIDINE 105250-16-6 C7H9NO
5-CHLORO-1,2-DIHYDRO-4-METHOXY-2-OXO-3-PYRIDINECARBONITRILE 5-CHLORO-1,2-DIHYDRO-4-METHOXY-2-OXO-3-PYRIDINECARBONITRILE 147619-40-7 C7H5ClN2O2
3-FLUORO-4-NITRO-5-PICOLINE 1-OXIDE 3-FLUORO-4-NITRO-5-PICOLINE 1-OXIDE 13958-88-8 C6H5FN2O3
2-ACETAMIDO-5-AMINO-4-PICOLINE 2-ACETAMIDO-5-AMINO-4-PICOLINE 475060-18-5 C8H11N3O
N-Phenyldiethanolamine 2-pyridylboronate N-Phenyldiethanolamine 2-pyridylboronate 662138-96-7 C15H17BN2O2
3-PYRIDINEALDOXIME 3-PYRIDINEALDOXIME 1193-92-6 C6H6N2O
2,6-DIFLUOROPYRIDINE-3-BORONIC ACID HYDRATE 2,6-DIFLUOROPYRIDINE-3-BORONIC ACID HYDRATE 1072952-27-2 C5H6BF2NO3
5-NITRONICOTINIC ACID 5-NITRONICOTINIC ACID 2047-49-6 C6H4N2O4
2-CHLOROPYRIDINE-3-SULFONIC ACID 2-CHLOROPYRIDINE-3-SULFONIC ACID 6602-56-8 C5H4ClNO3S
2 3 5 6-TETRAFLUORO-4-METHYLPYRIDINE  9& 2 3 5 6-TETRAFLUORO-4-METHYLPYRIDINE 9& 16297-14-6 C6H3F4N
5-BROMOPYRIDINE-3-SULPHONIC ACID 96 5-BROMOPYRIDINE-3-SULPHONIC ACID 96 62009-34-1 C5H4BrNO3S
2,6-DIMETHOXYPYRIDIN-3-AMINE 2,6-DIMETHOXYPYRIDIN-3-AMINE 28020-37-3 C7H10N2O2
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