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
DIETHYL(3-PYRIDYL)BORANE DIETHYL(3-PYRIDYL)BORANE 89878-14-8 C9H14BN
DI-2-PYRIDYL KETONE DI-2-PYRIDYL KETONE 19437-26-4 C11H8N2O
3-ETHOXY-2-NITROPYRIDINE 3-ETHOXY-2-NITROPYRIDINE 74037-50-6 C7H8N2O3
3-CHLORO-2-HYDROXY-5-NITROPYRIDINE 3-CHLORO-2-HYDROXY-5-NITROPYRIDINE 22353-38-4 C5H3ClN2O3
2,6-Di-tert-butyl-4-methylpyridine 2,6-Di-tert-butyl-4-methylpyridine 38222-83-2 C14H23N
2-Pyridinol-1-oxide 2-Pyridinol-1-oxide 13161-30-3 C5H5NO2
1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one 1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one 6969-71-7 C6H5N3O
2-HYDROXY-3-NITROPYRIDINE 2-HYDROXY-3-NITROPYRIDINE 137280-55-8 C5H4N2O3
5-Bromo-2-fluoro-4-methyl-pyridine 5-Bromo-2-fluoro-4-methyl-pyridine 864830-16-0 C6H5BrFN
6-Chloro-2-picoline 6-Chloro-2-picoline 18368-63-3 C6H6ClN
2-Pyridylethylamine 2-Pyridylethylamine 2706-56-1 C7H10N2
Pyridin-2-ol Pyridin-2-ol 72762-00-6 C5H5NO
2-Amino-4-ethylpyridine 2-Amino-4-ethylpyridine 33252-32-3 C7H10N2
2,6-DICHLORO-4-(TRIFLUOROMETHYL)NICOTINAMIDE 2,6-DICHLORO-4-(TRIFLUOROMETHYL)NICOTINAMIDE 158063-67-3 C7H3Cl2F3N2O
3,5-Dichloro-2,4,6-trifluoropyridine 3,5-Dichloro-2,4,6-trifluoropyridine 1737-93-5 C5Cl2F3N
2-FLUORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE 2-FLUORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE 58086-67-2 C13H14FNO3S
5-FLUORO-2-PICOLINIC ACID 5-FLUORO-2-PICOLINIC ACID 107504-08-5 C6H4FNO2
2-Bromo-4-fluoropyridine 2-Bromo-4-fluoropyridine 357927-50-5 C5H3BrFN
Deferiprone Deferiprone 30652-11-0 C7H9NO2
5-CHLORO-2,3-DIAMINOPYRIDINE 5-CHLORO-2,3-DIAMINOPYRIDINE 25710-20-7 C5H6ClN3
2-Chloromethyl-4-(3-methoxypropoxy)-3-methylpyridin 2-Chloromethyl-4-(3-methoxypropoxy)-3-methylpyridin 117977-20-5 C11H16ClNO2
Ethyl 2-pyridylacetate Ethyl 2-pyridylacetate 2739-98-2 C9H11NO2
3-Pyridineethaneamine 3-Pyridineethaneamine 20173-24-4 C7H10N2
2-Benzylpyridine 2-Benzylpyridine 101-82-6 C12H11N
4,4-Difluoropiperidine hydrochloride 4,4-Difluoropiperidine hydrochloride 144230-52-4 C5H9F2N.ClH
2-Bromo-5-iodopyridine 2-Bromo-5-iodopyridine 73290-22-9 C5H3BrIN
2-Fluoro-5-bromopyridine 2-Fluoro-5-bromopyridine 766-11-0 C5H3BrFN
5-Chloro-2-fluoropyridine 5-Chloro-2-fluoropyridine 1480-65-5 C5H3ClFN
2-Amino-5-nitro-4-picoline 2-Amino-5-nitro-4-picoline 21901-40-6 C6H7N3O2
2,5-DIBROMO-6-METHYLPYRIDINE 2,5-DIBROMO-6-METHYLPYRIDINE 39919-65-8 C6H5Br2N
2,6-Dihydroxy-3,4-dimethylpyridine 2,6-Dihydroxy-3,4-dimethylpyridine 84540-47-6 C7H9NO2
2-Hydroxymethyl-5-bromopyridine 2-Hydroxymethyl-5-bromopyridine 88139-91-7 C6H6BrNO
3-Amino-2-picoline 3-Amino-2-picoline 3430-10-2 C6H8N2
2-Acetyl-5-bromothiophene 2-Acetyl-5-bromothiophene 5370-25-2 C6H5BrOS
2-Fluoro-6-trifluoromethylpyridine 2-Fluoro-6-trifluoromethylpyridine 94239-04-0 C6H3F4N
4-Chloro-3-nitropyridine 4-Chloro-3-nitropyridine 13091-23-1 C5H3ClN2O2
3-Trifluoromethylpyridine 3-Trifluoromethylpyridine 3796-23-4 C6H4F3N
4-(3'-Methylphenyl)amino-3-pyridinesulfonamide 4-(3'-Methylphenyl)amino-3-pyridinesulfonamide 72811-73-5 C12H13N3O2S
5-Bromo-2-chloronicotinic acid 5-Bromo-2-chloronicotinic acid 29241-65-4 C6H3BrClNO2
THIENO(3 2-B)PYRIDIN-7-OL THIENO(3 2-B)PYRIDIN-7-OL 107818-20-2 C7H5NOS
5-ACETYL-2-METHYLPYRIDINE 5-ACETYL-2-METHYLPYRIDINE 36357-38-7 C8H9NO
3-Aminopyridin-4-ol 3-Aminopyridin-4-ol 6320-39-4 C5H6N2O
5-Amino-2-chloropyridine 5-Amino-2-chloropyridine 5350-93-6 C5H5ClN2
4-Cyanopyridine 4-Cyanopyridine 100-48-1 C6H4N2
(3-IODO-PYRIDIN-4-YL)-CARBAMIC ACID TERT-BUTYL ESTER (3-IODO-PYRIDIN-4-YL)-CARBAMIC ACID TERT-BUTYL ESTER 211029-67-3 C10H13IN2O2
2-Amino-5-chloro-4-picoline 2-Amino-5-chloro-4-picoline 36936-27-3 C6H7ClN2
2-Amino-5-chloropyridine 2-Amino-5-chloropyridine 1072-98-6 C5H5ClN2
3-Bromo-2-fluoropyridine 3-Bromo-2-fluoropyridine 36178-05-9 C5H3BrFN
2,3,5-Tribromopyridine 2,3,5-Tribromopyridine 75806-85-8 C5H2Br3N
3-BROMO-5-FLUORO-2-METHOXYPYRIDINE 3-BROMO-5-FLUORO-2-METHOXYPYRIDINE 884494-81-9 C6H5BrFNO
5-BROMOPYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 5-BROMOPYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 29682-15-3 C7H6BrNO2
3-ACETYL-2-CHLOROPYRIDINE 3-ACETYL-2-CHLOROPYRIDINE 55676-21-6 C7H6ClNO
2-CHLORO-3-FLUOROPYRIDINE-4-BORONIC ACID 2-CHLORO-3-FLUOROPYRIDINE-4-BORONIC ACID 937595-71-6 C5H4BClFNO2
2-Trifluoromethyl-5-pyridineboric acid 2-Trifluoromethyl-5-pyridineboric acid 868662-36-6 C6H5BF3NO2
2-METHOXY-5-NITRO-4-PICOLINE 2-METHOXY-5-NITRO-4-PICOLINE 6635-90-1 C7H8N2O3
2-Amino-3-bromo-6-methylpyridine 2-Amino-3-bromo-6-methylpyridine 126325-46-0 C6H7BrN2
4-Amino-2-chloropyridine 4-Amino-2-chloropyridine 14432-12-3 C5H5ClN2
2-(Chloromethyl)-3,5-dimethyl-4-methoxypyridine 2-(Chloromethyl)-3,5-dimethyl-4-methoxypyridine 84006-10-0 C9H12ClNO
2-Fluoropyridine-5-carboxaldehyde 2-Fluoropyridine-5-carboxaldehyde 677728-92-6 C6H4FNO
2,4-DICHLORO-5-NITROPYRIDINE 2,4-DICHLORO-5-NITROPYRIDINE 4487-56-3 C5H2Cl2N2O2
5-Amino-2,3-dichloropyridine 5-Amino-2,3-dichloropyridine 98121-41-6 C5H4Cl2N2
2,6-Diaminopyridine 2,6-Diaminopyridine 141-86-6 C5H7N3
3-BROMO-2-HYDROXY-5-METHYLPYRIDINE 3-BROMO-2-HYDROXY-5-METHYLPYRIDINE 17282-02-9 C6H6BrNO
5-Iodo-3-methyl-2-pyridinamine 5-Iodo-3-methyl-2-pyridinamine 166266-19-9 C6H7IN2
3-ETHYNYLPYRIDINE 3-ETHYNYLPYRIDINE 2510-23-8 C7H5N
5-Nitropyridine-2-carboxylic acid 5-Nitropyridine-2-carboxylic acid 30651-24-2 C6H4N2O4
(6-BROMO-PYRIDIN-3-YL)-METHANOL (6-BROMO-PYRIDIN-3-YL)-METHANOL 122306-01-8 C6H6BrNO
4-Amino-3-bromopyridine 4-Amino-3-bromopyridine 13534-98-0 C5H5BrN2
2-Amino-6-chloro-3-nitropyridine 2-Amino-6-chloro-3-nitropyridine 27048-04-0 C5H4ClN3O2
2-[N,N-BIS(TRIFLUOROMETHANESULFONYL)AMINO]-5-CHLOROPYRIDINE 2-[N,N-BIS(TRIFLUOROMETHANESULFONYL)AMINO]-5-CHLOROPYRIDINE 145100-51-2 C7H3ClF6N2O4S2
2-Bromo-4-methylpyridine 2-Bromo-4-methylpyridine 4926-28-7 C6H6BrN
5-Bromo-3-nitropyridine-2-carbonitrile 5-Bromo-3-nitropyridine-2-carbonitrile 573675-25-9 C6H2BrN3O2
2-Pyridylacetic acid hydrochloride 2-Pyridylacetic acid hydrochloride 16179-97-8 C7H8ClNO2
2,6-Difluoropyridine-3-boronic acid 2,6-Difluoropyridine-3-boronic acid 136466-94-9 C5H4BF2NO2
5-Chloronicotinic acid 5-Chloronicotinic acid 22620-27-5 C6H4ClNO2
2-Hydroxy-5-iodopyridine 2-Hydroxy-5-iodopyridine 13472-79-2 C5H4INO
2,4-DICHLORO-6-METHYL-3-NITROPYRIDINE 2,4-DICHLORO-6-METHYL-3-NITROPYRIDINE 63897-12-1 C6H4Cl2N2O2
Ethyl 2-aminopyridine-3-carboxylate Ethyl 2-aminopyridine-3-carboxylate 13362-26-0 C8H10N2O2
2-Amino-3,5-dichloropyridine 2-Amino-3,5-dichloropyridine 4214-74-8 C5H4Cl2N2
3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one 3-(2-Chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one 63234-80-0 C11H15ClN2O
2-HYDROXY-6-METHYLPYRIDINE 2-HYDROXY-6-METHYLPYRIDINE 91914-07-7 C6H7NO
2-Bromo-4-ethylpyridine 2-Bromo-4-ethylpyridine 54453-91-7 C7H8BrN
3-Picolyl chloride hydrochloride 3-Picolyl chloride hydrochloride 6959-48-4 C6H7Cl2N
2,6-Dichloropyridin-3-amine 2,6-Dichloropyridin-3-amine 62476-56-6 C5H4Cl2N2
2-Hydrazinopyridine 2-Hydrazinopyridine 4930-98-7 C5H7N3
2-Amino-5-bromo-4-methylpyridine 2-Amino-5-bromo-4-methylpyridine 98198-48-2 C6H7BrN2
4-Pyridyl acetone 4-Pyridyl acetone 6304-16-1 C8H9NO
2-Chloropyridine-N-oxide 2-Chloropyridine-N-oxide 2402-95-1 C5H4ClNO
3-BROMO-5-CHLORO-2-METHOXY-PYRIDINE 3-BROMO-5-CHLORO-2-METHOXY-PYRIDINE 102830-75-1 C6H5BrClNO
2-Methoxy-5-(trifluoromethyl)pyridine 2-Methoxy-5-(trifluoromethyl)pyridine 175277-45-9 C7H6F3NO
N-Methyl-4-pyridinamine N-Methyl-4-pyridinamine 1121-58-0 C6H8N2
2-Chloro-4-bromopyridine 2-Chloro-4-bromopyridine 73583-37-6 C5H3BrClN
5-CYANO-2-METHYLPYRIDINE 5-CYANO-2-METHYLPYRIDINE 3222-48-8 C7H6N2
4-Bromopyridine hydrochloride 4-Bromopyridine hydrochloride 19524-06-2 C5H5BrClN
2-Fluoropyridine-6-carboxylic acid 2-Fluoropyridine-6-carboxylic acid 402-69-7 C6H4FNO2
2-Fluoro-3-nitropyridine 2-Fluoro-3-nitropyridine 1480-87-1 C5H3FN2O2
2-Hydroxy-6-methyl-5-nitropyridine 2-Hydroxy-6-methyl-5-nitropyridine 28489-45-4 C6H6N2O3
3-Chloro-2-nitropyridine 3-Chloro-2-nitropyridine 54231-32-2 C5H3ClN2O2
5-BROMO-2-HYDRAZINOPYRIDINE 5-BROMO-2-HYDRAZINOPYRIDINE 77992-44-0 C5H6BrN3
3-FORMYL-6-METHYL-PYRIDINE 3-FORMYL-6-METHYL-PYRIDINE 53014-84-9 C7H7NO
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