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
2,4-Dichloro-6-picoline 2,4-Dichloro-6-picoline 42779-56-6 C6H5Cl2N
3-Amino-2-hydroxypyridine 3-Amino-2-hydroxypyridine 59315-44-5 C5H6N2O
2,6-Dichloro-4-(trifluoromethyl)pyridine 2,6-Dichloro-4-(trifluoromethyl)pyridine 39890-98-7 C6H2Cl2F3N
2-METHYL-6-(TRIFLUOROMETHYL)NICOTINIC ACID 2-METHYL-6-(TRIFLUOROMETHYL)NICOTINIC ACID 261635-93-2 C8H6F3NO2
4-AMINO-3,5-DIBROMOPYRIDINE 4-AMINO-3,5-DIBROMOPYRIDINE 84539-34-4 C5H4Br2N2
4-Amino-2-methoxypyridine 4-Amino-2-methoxypyridine 20265-39-8 C6H8N2O
5-Chloro-2,3-difluoropyridine 5-Chloro-2,3-difluoropyridine 89402-43-7 C5H2ClF2N
5-Bromo-2-chloro-3-fluoropyridine 5-Bromo-2-chloro-3-fluoropyridine 831203-13-5 C5H2BrClFN
2-Amino-4-chloro-3-nitropyridine 2-Amino-4-chloro-3-nitropyridine 6980-08-1 C5H4ClN3O2
2-FLUORO-5-NITRO-3-PICOLINE 2-FLUORO-5-NITRO-3-PICOLINE 19346-46-4 C6H5FN2O2
4-Methoxypyridine N-oxide 4-Methoxypyridine N-oxide 1122-96-9 C6H7NO2
5-CYANO-3-PYRIDINYL BORONIC ACID 5-CYANO-3-PYRIDINYL BORONIC ACID 497147-93-0 C6H5BN2O2
3-Amino-5-bromopyridine 3-Amino-5-bromopyridine 13535-01-8 C5H5BrN2
2-HYDROXY-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 2-HYDROXY-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 33252-64-1 C6H3F3N2O3
2-Bromo-1-ethylpyridinium tetrafluoroborate 2-Bromo-1-ethylpyridinium tetrafluoroborate 878-23-9 C7H9BBrF4N
2-Hydroxy-5-nitropyridine 2-Hydroxy-5-nitropyridine 5418-51-9 C5H4N2O3
2-Amino-4-cyanopyridine 2-Amino-4-cyanopyridine 42182-27-4 C6H5N3
3-Fluoro-5-hydroxypyridine 3-Fluoro-5-hydroxypyridine 209328-55-2 C5H4FNO
3-(Trifluoromethyl)pyrid-2-ylhydrazine 3-(Trifluoromethyl)pyrid-2-ylhydrazine 89570-83-2 C6H6F3N3
2,5,6-Tribromo-3-methylpyridine 2,5,6-Tribromo-3-methylpyridine 393516-82-0 C6H4Br3N
4-Ethylpyridine 4-Ethylpyridine 536-75-4 C7H9N
3,5-Dichloropyridine 3,5-Dichloropyridine 2457-47-8 C5H3Cl2N
4-Chloro-3-fluoropyridine 4-Chloro-3-fluoropyridine 2546-56-7 C5H3ClFN
4-Pyridylcarbinol 4-Pyridylcarbinol 586-95-8 C6H7NO
3,5-Dichloro-2-cyanopyridine 3,5-Dichloro-2-cyanopyridine 85331-33-5 C6H2Cl2N2
2-Chloro-3-bromo-5-aminopyridine 2-Chloro-3-bromo-5-aminopyridine 130284-53-6 C5H4BrClN2
2-Amino-5-cyanopyridine 2-Amino-5-cyanopyridine 4214-73-7 C6H5N3
2-Chloro-5-trichloromethylpyridine 2-Chloro-5-trichloromethylpyridine 69045-78-9 C6H3Cl4N
2-(Trifluoromethyl)nicotinic acid 2-(Trifluoromethyl)nicotinic acid 131747-43-8 C7H4F3NO2
2-Amino-3-bromo-5-methylpyridine 2-Amino-3-bromo-5-methylpyridine 17282-00-7 C6H7BrN2
Isonicotinamide Isonicotinamide 1453-82-3 C6H6N2O
3,5-DICHLORO-2-PYRIDONE 3,5-DICHLORO-2-PYRIDONE 5437-33-2 C5H3Cl2NO
2,4-DIFLUORO-PYRIDINE 2,4-DIFLUORO-PYRIDINE 34941-90-7 C5H3F2N
2-Amino-3-methyl-5-nitropyridine 2-Amino-3-methyl-5-nitropyridine 18344-51-9 C6H7N3O2
3,5-DIBROMO-2-FLUOROPYRIDINE 3,5-DIBROMO-2-FLUOROPYRIDINE 473596-07-5 C5H2Br2FN
2-Anilinopyridine 2-Anilinopyridine 6631-37-4 C11H10N2
3-Hydroxy-6-methyl-2-pyridinemethanol 3-Hydroxy-6-methyl-2-pyridinemethanol 42097-42-7 C7H9NO2
2-Bromo-5-nitro-4-picoline 2-Bromo-5-nitro-4-picoline 23056-47-5 C6H5BrN2O2
5-BROMO-2-CHLORO-4-PICOLINE 5-BROMO-2-CHLORO-4-PICOLINE 778611-64-6 C6H5BrClN
2-Fluoro-5-iodopyridine 2-Fluoro-5-iodopyridine 171197-80-1 C5H3FIN
2-MERCAPTO-5-NITROPYRIDINE 2-MERCAPTO-5-NITROPYRIDINE 2127-09-5 C5H4N2O2S
3,5-Dimethyl-4-methoxy-2-pyridinemethanol 3,5-Dimethyl-4-methoxy-2-pyridinemethanol 86604-78-6 C9H13NO2
3-AMINO-2-METHOXY-6-PICOLINE 3-AMINO-2-METHOXY-6-PICOLINE 186413-79-6 C7H10N2O
2,4,6-TRIMETHYLPYRIDINIUM P-TOLUENESULFONATE 2,4,6-TRIMETHYLPYRIDINIUM P-TOLUENESULFONATE 59229-09-3 C15H19NO3S
2,3-Lutidine 2,3-Lutidine 583-61-9 C7H9N
2-(Bromomethyl)-6-methylpyridine 2-(Bromomethyl)-6-methylpyridine 68470-59-7 C7H8BrN
4-Bromo-3-methylpyridine 4-Bromo-3-methylpyridine 10168-00-0 C6H6BrN
5-Amino-2-fluoropyridine 5-Amino-2-fluoropyridine 1827-27-6 C5H5FN2
2-Chloro-4-(trifluoromethyl)pyridine 2-Chloro-4-(trifluoromethyl)pyridine 81565-18-6 C6H3ClF3N
2-Chloro-5-fluoro-3-methylpyridine 2-Chloro-5-fluoro-3-methylpyridine 38186-84-4 C6H5ClFN
3-Bromo-2-chloropyridine 3-Bromo-2-chloropyridine 52200-48-3 C5H3BrClN
4-(Chloromethyl)pyridine hydrochloride 4-(Chloromethyl)pyridine hydrochloride 1822-51-1 C6H6ClN.ClH
2-Bromo-4-cyanopyridine 2-Bromo-4-cyanopyridine 10386-27-3 C6H3BrN2
4-Chloropyridinium chloride 4-Chloropyridinium chloride 7379-35-3 C5H4ClN.ClH
4-Nitro-2-picoline N-oxide 4-Nitro-2-picoline N-oxide 5470-66-6 C6H6N2O3
2-ACETYLAMINO-5-BROMOPYRIDINE 2-ACETYLAMINO-5-BROMOPYRIDINE 7169-97-3 C7H7BrN2O
2-Chloro-3-methyl-5-bromopyridine 2-Chloro-3-methyl-5-bromopyridine 29241-60-9 C6H5BrClN
4-Fluoropyridine hydrochloride 4-Fluoropyridine hydrochloride 39160-31-1 C5H5ClFN
2-Chloro-3-nitro-6-methylpyridine 2-Chloro-3-nitro-6-methylpyridine 56057-19-3 C6H5ClN2O2
3-BROMO-4-CHLORO-5-NITROPYRIDINE 3-BROMO-4-CHLORO-5-NITROPYRIDINE 31872-63-6 C5H2BrClN2O2
3-Cyano-6-methyl-2(1H)-pyridinone 3-Cyano-6-methyl-2(1H)-pyridinone 4241-27-4 C7H6N2O
2-Chloro-4-cyanopyridine 2-Chloro-4-cyanopyridine 33252-30-1 C6H3ClN2
2-Acetyl-4-methylpyridine 2-Acetyl-4-methylpyridine 59576-26-0 C8H9NO
4-Hydroxypyridine-2-carboxylic acid 4-Hydroxypyridine-2-carboxylic acid 22468-26-4 C6H5NO3
Methyl 2-amino-5-bromonicotinate Methyl 2-amino-5-bromonicotinate 50735-34-7 C7H7BrN2O2
3-BROMO-2-CHLORO-4-PICOLINE 3-BROMO-2-CHLORO-4-PICOLINE 55404-31-4 C6H5BrClN
2-Chloro-3-cyano-4,6-dimethylpyridine 2-Chloro-3-cyano-4,6-dimethylpyridine 14237-71-9 C8H7ClN2
METHYL 2-OXO-1,2-DIHYDRO-3-PYRIDINECARBOXYLATE METHYL 2-OXO-1,2-DIHYDRO-3-PYRIDINECARBOXYLATE 10128-91-3 C7H7NO3
Methyl 2-chloro-6-methylpyridine-4-carboxylate Methyl 2-chloro-6-methylpyridine-4-carboxylate 3998-90-1 C8H8ClNO2
5-CYANO-2-FLUORO-3-PICOLINE 5-CYANO-2-FLUORO-3-PICOLINE 261625-67-6 C7H5FN2
4-Chloropyridine-2-carboxamide 4-Chloropyridine-2-carboxamide 99586-65-9 C6H5ClN2O
2-Fluoro-6-methyl-3-nitropyridine 2-Fluoro-6-methyl-3-nitropyridine 19346-45-3 C6H5FN2O2
2,6-Dihydroxypyridine 2,6-Dihydroxypyridine 626-06-2 C5H5NO2
2-Bromo-5-(trifluoromethyl)pyridine 2-Bromo-5-(trifluoromethyl)pyridine 50488-42-1 C6H3BrF3N
2-Picoline-N-oxide 2-Picoline-N-oxide 931-19-1 C6H7NO
3-Pyridyl bromide 3-Pyridyl bromide 626-55-1 C5H4BrN
5-Amino-2-bromopyridine 5-Amino-2-bromopyridine 13534-97-9 C5H5BrN2
2-amino-5-bromopyridin-3-ol 2-amino-5-bromopyridin-3-ol 39903-01-0 C5H5BrN2O
2-Chloro-5-nitropyridin-4-amine 2-Chloro-5-nitropyridin-4-amine 2604-39-9 C5H4ClN3O2
5-AMINO-2-CHLOROPYRIDINE-4-CARBOXYLIC ACID 5-AMINO-2-CHLOROPYRIDINE-4-CARBOXYLIC ACID 58483-95-7 C6H5ClN2O2
3-(AMINOMETHYL)PYRIDINE 3-(AMINOMETHYL)PYRIDINE 20173-04-0 C7H10N2
2,3,5-Trichloropyridine 2,3,5-Trichloropyridine 16063-70-0 C5H2Cl3N
5-Chloro-2-nitropyridine 5-Chloro-2-nitropyridine 52092-47-4 C5H3ClN2O2
2-Chloro-3,5-dibromopyridine 2-Chloro-3,5-dibromopyridine 40360-47-2 C5H2Br2ClN
4-BROMO-PYRIDINE-2-CARBONITRILE 4-BROMO-PYRIDINE-2-CARBONITRILE 62150-45-2 C6H3BrN2
2,6-Dichloro-3-nitropyridine 2,6-Dichloro-3-nitropyridine 16013-85-7 C5H2Cl2N2O2
5-BROMO-6-HYDROXYNICOTINIC ACID 5-BROMO-6-HYDROXYNICOTINIC ACID 41668-13-7 C6H4BrNO3
2-Hydroxypyridine 2-Hydroxypyridine 142-08-5 C5H5NO
3-Bromo-4-chloropyridine 3-Bromo-4-chloropyridine 36953-42-1 C5H3BrClN
Picloram Picloram 1918-02-1 C6H3Cl3N2O2
2,5-Dimethylpyridine 2,5-Dimethylpyridine 589-93-5 C7H9N
5-Amino-2-(trifluoromethyl)pyridine 5-Amino-2-(trifluoromethyl)pyridine 106877-33-2 C6H5F3N2
5-Chloro-3-nitropyridine-2-carbonitrile 5-Chloro-3-nitropyridine-2-carbonitrile 181123-11-5 C6H2ClN3O2
2,6-DIHYDROXYPYRIDINE HYDROCHLORIDE 2,6-DIHYDROXYPYRIDINE HYDROCHLORIDE 10357-84-3 C5H6ClNO2
2-Methoxy-3-(trifluoromethyl)pyridine 2-Methoxy-3-(trifluoromethyl)pyridine 121643-44-5 C7H6F3NO
1-Acetyl-4-piperidinecarboxylic acid 1-Acetyl-4-piperidinecarboxylic acid 25503-90-6 C8H13NO3
2-Trifluoromethyl-5-bromopyridine 2-Trifluoromethyl-5-bromopyridine 436799-32-5 C6H3BrF3N
2-Amino-5-bromo-6-methylpyridine 2-Amino-5-bromo-6-methylpyridine 42753-71-9 C6H7BrN2
2-Fluoro-5-nitropyridine 2-Fluoro-5-nitropyridine 456-24-6 C5H3FN2O2
5-Chloro-2-cyanopyridine 5-Chloro-2-cyanopyridine 89809-64-3 C6H3ClN2
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