Heterocyclic compound

Heterocyclic compounds are a class of organic compounds with cyclic structure. The ring-constituting atoms in the molecule, in addition to carbon, also include one or more nitrogen, sulfur, oxygen and other atoms. Those containing one ring are called single-heterocyclic compounds, such as furan, thiazole, and pyridine. Those containing two or more rings are called fused heterocyclic compounds such as quinoline and purine. The most common and most stable are five- or six-membered heterocyclic ring. Simple heterocyclic ring is capable of merging with benzene or another heterocyclic ring to form a bicyclic, tricyclic or more complex ring system. Some kinds of heterocyclic rings have features of aromatic compounds, such as being easy to participate into substitution reaction, difficult to have addition reaction and being stable to oxidant. Heterocyclic compounds are widely found in nature, such as nucleic acids, most kinds of vitamins, chlorophyll, heme, most kinds of alkaloids, pigments and so on. A fraction of the heterocyclic compounds have aromatic characteristics, such as plants coumarone, jasmonate and animals civetone. There are many synthetic pesticides that belong to such compounds such as herbicides atrazine, amitrole, CMPT, insecticide fluorine propargite, quinoline parathion, thioquinox and so on. Simple heterocyclic compound is an important raw material of organic chemical industry.

The cyclic compounds with atoms constituting the ring system, in addition to carbon atom, also containing O, S, and N heteroatom are collectively referred to as heterocyclic compounds. According to this definition, the cyclic dicarboxylic anhydride, the cyclic imide, lactones, lactides, cyclic anhydrides, lactams, and cyclic ethers, strictly speaking, also belong to heterocyclic compounds. However, due to the nature of these compounds are similar with aliphatic compound, and can easily undergo either the cyclization of the open-chain compounds or ring open reaction to be transformed into chain compounds, thus being generally attributed to the aliphatic chemistry for discussion. Therefore, heterocyclic compounds generally refer specifically to those heterocyclic compounds with relatively stable ring system but different levels of aromatic properties, namely aromatic heterocyclic compound.

The organic heterocyclic compounds belong to a large class in the three large categories of organic compounds, open chain, carbocyclic and heterocyclic organic compounds. It contains various kinds and has a large number accounting for about one-third of all known organic compounds and is also widespread in the biosphere, having close relation with the biological growth, development, reproduction, and genetic variation and so on. Common heterocyclic compounds include furan, thiophene, pyrrole, pyridine, quinoline, carbazole and so on.

These kinds of heterocyclic compounds are widely used in organic synthesis or as pharmaceuticals, pesticides, solvents and so on. They are colorless liquids with special smell or crystallization and have specific gravity being less than or close to water. They are toxic and can be soluble in some organic solvents and slightly soluble in water. In case of fire, heat, oxidants and strong acids, it can cause fire or explosion with simultaneous deposition of toxic sulfur dioxide or nitrogen oxide gas. Furan, when being exposed to the air, is capable of forming peroxides with causing an explosion during distillation. In the management of dangerous goods, according to the risk grades of fire, explosion, toxicity risk, they were classified as flammable liquids, flammable solids and organic toxic chemicals; when used in the reservoir, the first two comply danger of the A and B class while the latter one is based on class C fire danger for conducting fire management. In case of fire, we can use foam, dry powder, water mist, 1211 and carbon dioxide for fire extinguishing agents.

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Structure Chemical Name CAS MF
2-Chloro-4-cyanopyridine 2-Chloro-4-cyanopyridine 33252-30-1 C6H3ClN2
2-Acetyl-4-methylpyridine 2-Acetyl-4-methylpyridine 59576-26-0 C8H9NO
2-Chloro-3-methyl-5-bromopyridine 2-Chloro-3-methyl-5-bromopyridine 29241-60-9 C6H5BrClN
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
3-Amino-2-bromo-5-fluoropyridine 3-Amino-2-bromo-5-fluoropyridine 884495-03-8 C5H4BrFN2
5-Ethyl-2-methylpyridine 5-Ethyl-2-methylpyridine 104-90-5 C8H11N
2,4-Dichloro-5-aminopyrimidine 2,4-Dichloro-5-aminopyrimidine 5177-27-5 C4H3Cl2N3
2-Chloro-4-methyl-5-nitropyridine 2-Chloro-4-methyl-5-nitropyridine 23056-33-9 C6H5ClN2O2
2-BROMO-5-NITRO-6-PICOLINE 2-BROMO-5-NITRO-6-PICOLINE 22282-96-8 C6H5BrN2O2
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
2-Chloro-4-picoline 2-Chloro-4-picoline 3678-62-4 C6H6ClN
4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile 4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile 21642-98-8 C7H6N2O2
3-BROMO-2-CHLORO-6-PICOLINE 3-BROMO-2-CHLORO-6-PICOLINE 185017-72-5 C6H5BrClN
6-Methoxynicotinic acid 6-Methoxynicotinic acid 66572-55-2 C7H7NO3
5-CHLORO-2-FLUORO-3-NITROPYRIDINE 5-CHLORO-2-FLUORO-3-NITROPYRIDINE 60186-16-5 C5H2ClFN2O2
2-Amino-3-bromo-5-chloropyridine 2-Amino-3-bromo-5-chloropyridine 26163-03-1 C5H4BrClN2
2-Chloro-4-hydroxypyridine 2-Chloro-4-hydroxypyridine 17368-12-6 C5H4ClNO
5-Bromo-2-methylpyridine 5-Bromo-2-methylpyridine 3430-13-5 C6H6BrN
2-CYANO-3-HYDROXYPYRIDINE 2-CYANO-3-HYDROXYPYRIDINE 932-35-4 C6H4N2O
2-Amino-5-chloro-3-nitropyridine 2-Amino-5-chloro-3-nitropyridine 5409-39-2 C5H4ClN3O2
2-CHLORO-3,5-DINITROPYRIDINE 2-CHLORO-3,5-DINITROPYRIDINE 2578-45-2 C5H2ClN3O4
1,2,3,4-Tetrahydro-8-hydroxyquinoline 1,2,3,4-Tetrahydro-8-hydroxyquinoline 6640-50-2 C9H11NO
2-Methylthio-4,6-pyrimidinedione 2-Methylthio-4,6-pyrimidinedione 1979-98-2 C5H6N2O2S
(2-AMINO-PYRIDIN-4-YL)-METHANOL (2-AMINO-PYRIDIN-4-YL)-METHANOL 105250-17-7 C6H8N2O
5-Methylpyridin-3-amine 5-Methylpyridin-3-amine 3430-19-1 C6H8N2
2-AMINO-4,6-DIHYDROXY-5-NITROPYRIMIDINE 2-AMINO-4,6-DIHYDROXY-5-NITROPYRIMIDINE 80466-56-4 C4H4N4O4
5-Bromo-3-formylpyridine 5-Bromo-3-formylpyridine 113118-81-3 C6H4BrNO
2-BROMO-4,6-DIMETHYLPYRIDINE 2-BROMO-4,6-DIMETHYLPYRIDINE 4926-26-5 C7H8BrN
2-BROMO-3-NITRO-4-PICOLINE 2-BROMO-3-NITRO-4-PICOLINE 23056-45-3 C6H5BrN2O2
3-FLUORO-2-HYDROXYPYRIDINE 3-FLUORO-2-HYDROXYPYRIDINE 1547-29-1 C5H4FNO
3-BROMOPYRIDIN-4-YLBORONIC ACID 3-BROMOPYRIDIN-4-YLBORONIC ACID 458532-99-5 C5H5BBrNO2
3-CHLOROPYRIDAZINE 3-CHLOROPYRIDAZINE 1120-95-2 C4H3ClN2
2-Bromopyrimidine 2-Bromopyrimidine 4595-60-2 C4H3BrN2
4-Amino-2,6-dimethoxypyrimidine 4-Amino-2,6-dimethoxypyrimidine 3289-50-7 C6H9N3O2
2-Amino-5-bromopyridine 2-Amino-5-bromopyridine 1072-97-5 C5H5BrN2
7-BROMO-4-CHLOROTHIENO[3,2-D]PYRIMIDINE 7-BROMO-4-CHLOROTHIENO[3,2-D]PYRIMIDINE 31169-27-4 C6H2BrClN2S
2,4-Dihydroxy-3-nitropyridine 2,4-Dihydroxy-3-nitropyridine 89282-12-2 C5H4N2O4
2,2'-DITHIOBIS(5-NITROPYRIDINE) 2,2'-DITHIOBIS(5-NITROPYRIDINE) 2127-10-8 C10H6N4O4S2
2-Phenylquinoline 2-Phenylquinoline 612-96-4 C15H11N
5-CARBETHOXY-2-THIOURACIL 5-CARBETHOXY-2-THIOURACIL 38026-46-9 C7H8N2O3S
4-Amino-2-ethoxypyridine 4-Amino-2-ethoxypyridine 89943-12-4 C7H10N2O
3-Methyl-2-pyridone 3-Methyl-2-pyridone 1003-56-1 C6H7NO
3-Bromo-5-methylpyridine 3-Bromo-5-methylpyridine 3430-16-8 C6H6BrN
IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID 133427-08-4 C8H6N2O2
2,4-DICHLORO-7H-PYRROLO2,3-DPYRIMIDINE 2,4-DICHLORO-7H-PYRROLO2,3-DPYRIMIDINE 90213-66-4 C6H3Cl2N3
3-Bromo-5-hydroxypyridine 3-Bromo-5-hydroxypyridine 74115-13-2 C5H4BrNO
4-Chloro-2-hydroxypyridine 4-Chloro-2-hydroxypyridine 40673-25-4 C5H4ClNO
3-Ethynylthiophene 3-Ethynylthiophene 67237-53-0 C6H4S
4-Chloro-3-methylpyridine 4-Chloro-3-methylpyridine 1681-36-3 C6H6ClN
2,4,6-Trichloropyridine 2,4,6-Trichloropyridine 16063-69-7 C5H2Cl3N
3-AMINO-2-BROMO-5-CHLOROPYRIDINE 3-AMINO-2-BROMO-5-CHLOROPYRIDINE 90902-83-3 C5H4BrClN2
5-Bromo-2-methoxypyrimidine 5-Bromo-2-methoxypyrimidine 14001-66-2 C5H5BrN2O
3-CHLOROISONICOTINALDEHYDE 3-CHLOROISONICOTINALDEHYDE 72990-37-5 C6H4ClNO
(R)-2,5-Dihydro-3,6-dimethoxy-2-isopropylpyrazine (R)-2,5-Dihydro-3,6-dimethoxy-2-isopropylpyrazine 109838-85-9 C9H16N2O2
2-Amino-5-bromo-3-nitropyridine 2-Amino-5-bromo-3-nitropyridine 6945-68-2 C5H4BrN3O2
4,6-Dimethoxypyrimidine 4,6-Dimethoxypyrimidine 5270-94-0 C6H8N2O2
3-CHLORO-2-METHOXY-5-(TRIFLUOROMETHYL)PYRIDINE 3-CHLORO-2-METHOXY-5-(TRIFLUOROMETHYL)PYRIDINE 175136-17-1 C7H5ClF3NO
3-Bromoimidazo[1,2-a]pyrimidine 3-Bromoimidazo[1,2-a]pyrimidine 6840-45-5 C6H4BrN3
3-CHLORO-6-PHENYLPYRIDAZINE 3-CHLORO-6-PHENYLPYRIDAZINE 20375-65-9 C10H7ClN2
2-Amino-4-(trifluoromethyl)pyridine 2-Amino-4-(trifluoromethyl)pyridine 106447-97-6 C6H5F3N2
2-Amino-4-chloropyridine 2-Amino-4-chloropyridine 19798-80-2 C5H5ClN2
Clopyralid Clopyralid 1702-17-6 C6H3Cl2NO2
6-Chloroimidazo[2,1-f]pyridazine 6-Chloroimidazo[2,1-f]pyridazine 6775-78-6 C6H4ClN3
3,6-Dihydroxy-4-methylpyridazine 3,6-Dihydroxy-4-methylpyridazine 5754-18-7 C5H6N2O2
2,3,4,6-Tetra-O-benzyl-D-glucopyranose 2,3,4,6-Tetra-O-benzyl-D-glucopyranose 4132-28-9 C34H36O6
5-BROMO-2,3-DIFLUOROPYRIDINE 5-BROMO-2,3-DIFLUOROPYRIDINE 89402-44-8 C5H2BrF2N
5-Amino-2-chloro-3-picoline 5-Amino-2-chloro-3-picoline 38186-82-2 C6H7ClN2
4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate 4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate 65802-56-4 C4H7N3O2S
2-AMINO-5,6-DIMETHYL-4-HYDROXYPYRIMIDINE 2-AMINO-5,6-DIMETHYL-4-HYDROXYPYRIMIDINE 3977-23-9 C6H9N3O
4,6-DIAMINO-2-METHYLMERCAPTOPYRIMIDINE 4,6-DIAMINO-2-METHYLMERCAPTOPYRIMIDINE 1005-39-6 C5H8N4S
2-Methoxynicotinic acid 2-Methoxynicotinic acid 16498-81-0 C7H7NO3
5-BROMO-2-HYDROXY-4-METHYLPYRIDINE 5-BROMO-2-HYDROXY-4-METHYLPYRIDINE 164513-38-6 C6H6BrNO
2-Fluoro-5-bromo-3-methylpyridine 2-Fluoro-5-bromo-3-methylpyridine 29312-98-9 C6H5BrFN
2-FLUORO-3-METHYLPYRIDINE-5-BORONIC ACID 2-FLUORO-3-METHYLPYRIDINE-5-BORONIC ACID 904326-92-7 C6H7BFNO2
5-Ethylpyridine-2,3-dicarboxylic acid diethyl ester 5-Ethylpyridine-2,3-dicarboxylic acid diethyl ester 105151-39-1 C13H17NO4
Kojic acid Kojic acid 501-30-4 C6H6O4
2-Chloropyrimidine 2-Chloropyrimidine 1722-12-9 C4H3ClN2
5-HYDROXY-2-METHOXYPYRIDINE 5-HYDROXY-2-METHOXYPYRIDINE 51834-97-0 C6H7NO2
N-Methylpyrrole-2-carboxylic acid N-Methylpyrrole-2-carboxylic acid 6973-60-0 C6H7NO2
2-Amino-5-iodopyridine 2-Amino-5-iodopyridine 20511-12-0 C5H5IN2
5-Bromo-2-iodopyrimidine 5-Bromo-2-iodopyrimidine 183438-24-6 C4H2BrIN2
2,5-Dibromopyridine 2,5-Dibromopyridine 624-28-2 C5H3Br2N
4-AMINO-3-HYDROXY PYRIDINE 4-AMINO-3-HYDROXY PYRIDINE 52334-53-9 C5H6N2O
2-ACETYL-5-CHLOROTHIOPHENE 2-ACETYL-5-CHLOROTHIOPHENE 6310-09-4 C6H5ClOS
5-FLUORO-2-HYDROXY-3-NITROPYRIDINE 5-FLUORO-2-HYDROXY-3-NITROPYRIDINE 136888-20-5 C5H3FN2O3
3-(2-Chloroethyl)-2-methylpyrido[1,2-a]pyrimidin-4-one 3-(2-Chloroethyl)-2-methylpyrido[1,2-a]pyrimidin-4-one 41078-70-0 C11H11ClN2O
3-Amino-6-hydroxypyridine 3-Amino-6-hydroxypyridine 33630-94-3 C5H6N2O
4-AMINO-6-HYDROXY-2-METHYLPYRIMIDINE 4-AMINO-6-HYDROXY-2-METHYLPYRIMIDINE 767-16-8 C5H7N3O
N-Methylhomopiperazine N-Methylhomopiperazine 4318-37-0 C6H14N2
4-Amino-2-chloro-3-nitropyridine 4-Amino-2-chloro-3-nitropyridine 2789-25-5 C5H4ClN3O2
2-Chloro-5-nitropyrimidine 2-Chloro-5-nitropyrimidine 10320-42-0 C4H2ClN3O2
3,4,5-TRICHLOROPYRIDAZINE 3,4,5-TRICHLOROPYRIDAZINE 14161-11-6 C4HCl3N2
5,6,7,8-Tetrahydroquinolin-8-ol 5,6,7,8-Tetrahydroquinolin-8-ol 14631-46-0 C9H11NO
2-Amino-6-methoxypyridine 2-Amino-6-methoxypyridine 17920-35-3 C6H8N2O
2-Methoxypyridin-3-amine 2-Methoxypyridin-3-amine 20265-38-7 C6H8N2O
2-Chloro-3-methyl-5-nitropyridine 2-Chloro-3-methyl-5-nitropyridine 22280-56-4 C6H5ClN2O2
2,5-DIBROMO-3-BUTYLTHIOPHENE 2,5-DIBROMO-3-BUTYLTHIOPHENE 116971-10-9 C8H10Br2S
2-Amino-5-bromo-4,6-dimethylpyrimidine 2-Amino-5-bromo-4,6-dimethylpyrimidine 4214-57-7 C6H8BrN3
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