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Heterocyclic compound

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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:
2-Acetyl-4-methylpyridine
CAS:
59576-26-0
MF:
C8H9NO
Structure:
Chemical Name:
4-Nitro-2-picoline N-oxide
CAS:
5470-66-6
MF:
C6H6N2O3
Structure:
Chemical Name:
2-ACETYLAMINO-5-BROMOPYRIDINE
CAS:
7169-97-3
MF:
C7H7BrN2O
Structure:
Chemical Name:
2-Chloro-3-methyl-5-bromopyridine
CAS:
29241-60-9
MF:
C6H5BrClN
Structure:
Chemical Name:
4-Fluoropyridine hydrochloride
CAS:
39160-31-1
MF:
C5H5ClFN
Structure:
Chemical Name:
2-Chloro-3-nitro-6-methylpyridine
CAS:
56057-19-3
MF:
C6H5ClN2O2
Structure:
Chemical Name:
2-Chloro-4-picoline
CAS:
3678-62-4
MF:
C6H6ClN
Structure:
Chemical Name:
4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile
CAS:
21642-98-8
MF:
C7H6N2O2
Structure:
Chemical Name:
3-BROMO-2-CHLORO-6-PICOLINE
CAS:
185017-72-5
MF:
C6H5BrClN
Structure:
Chemical Name:
6-Methoxynicotinic acid
CAS:
66572-55-2
MF:
C7H7NO3
Structure:
Chemical Name:
5-CHLORO-2-FLUORO-3-NITROPYRIDINE
CAS:
60186-16-5
MF:
C5H2ClFN2O2
Structure:
Chemical Name:
2-Amino-3-bromo-5-chloropyridine
CAS:
26163-03-1
MF:
C5H4BrClN2
Structure:
Chemical Name:
3-Ethynylthiophene
CAS:
67237-53-0
MF:
C6H4S
Structure:
Chemical Name:
4-Chloro-3-methylpyridine
CAS:
1681-36-3
MF:
C6H6ClN
Structure:
Chemical Name:
2,4,6-Trichloropyridine
CAS:
16063-69-7
MF:
C5H2Cl3N
Structure:
Chemical Name:
3-AMINO-2-BROMO-5-CHLOROPYRIDINE
CAS:
90902-83-3
MF:
C5H4BrClN2
Structure:
Chemical Name:
5-Bromo-2-methoxypyrimidine
CAS:
14001-66-2
MF:
C5H5BrN2O
Structure:
Chemical Name:
3-BROMO-4-CHLORO-5-NITROPYRIDINE
CAS:
31872-63-6
MF:
C5H2BrClN2O2
Structure:
Chemical Name:
4-AMINO-6-HYDROXY-2-METHYLPYRIMIDINE
CAS:
767-16-8
MF:
C5H7N3O
Structure:
Chemical Name:
N-Methylhomopiperazine
CAS:
4318-37-0
MF:
C6H14N2
Structure:
Chemical Name:
2-CYANO-3-HYDROXYPYRIDINE
CAS:
932-35-4
MF:
C6H4N2O
Structure:
Chemical Name:
2-Amino-5-chloro-3-nitropyridine
CAS:
5409-39-2
MF:
C5H4ClN3O2
Structure:
Chemical Name:
2-CHLORO-3,5-DINITROPYRIDINE
CAS:
2578-45-2
MF:
C5H2ClN3O4
Structure:
Chemical Name:
1,2,3,4-Tetrahydro-8-hydroxyquinoline
CAS:
6640-50-2
MF:
C9H11NO
Structure:
Chemical Name:
2-(methylthio)pyrimidine-4,6-diol
CAS:
1979-98-2
MF:
C5H6N2O2S
Structure:
Chemical Name:
(2-AMINO-PYRIDIN-4-YL)-METHANOL
CAS:
105250-17-7
MF:
C6H8N2O
Structure:
Chemical Name:
5-Methylpyridin-3-amine
CAS:
3430-19-1
MF:
C6H8N2
Structure:
Chemical Name:
2-AMINO-4,6-DIHYDROXY-5-NITROPYRIMIDINE
CAS:
80466-56-4
MF:
C4H4N4O4
Structure:
Chemical Name:
5-Bromo-3-pyridinecarboxaldehyde
CAS:
113118-81-3
MF:
C6H4BrNO
Structure:
Chemical Name:
2-BROMO-4,6-DIMETHYLPYRIDINE
CAS:
4926-26-5
MF:
C7H8BrN
Structure:
Chemical Name:
2-BROMO-3-NITRO-4-PICOLINE
CAS:
23056-45-3
MF:
C6H5BrN2O2
Structure:
Chemical Name:
3-FLUORO-2-HYDROXYPYRIDINE
CAS:
1547-29-1
MF:
C5H4FNO
Structure:
Chemical Name:
3-BROMOPYRIDIN-4-YLBORONIC ACID
CAS:
458532-99-5
MF:
C5H5BBrNO2
Structure:
Chemical Name:
3-CHLOROPYRIDAZINE
CAS:
1120-95-2
MF:
C4H3ClN2
Structure:
Chemical Name:
2-Bromopyrimidine
CAS:
4595-60-2
MF:
C4H3BrN2
Structure:
Chemical Name:
4-Amino-2,6-dimethoxypyrimidine
CAS:
3289-50-7
MF:
C6H9N3O2
Structure:
Chemical Name:
2-Amino-5-bromopyridine
CAS:
1072-97-5
MF:
C5H5BrN2
Structure:
Chemical Name:
7-BROMO-4-CHLOROTHIENO[3,2-D]PYRIMIDINE
CAS:
31169-27-4
MF:
C6H2BrClN2S
Structure:
Chemical Name:
2,4-Dihydroxy-3-nitropyridine
CAS:
89282-12-2
MF:
C5H4N2O4
Structure:
Chemical Name:
2,2'-DITHIOBIS(5-NITROPYRIDINE)
CAS:
2127-10-8
MF:
C10H6N4O4S2
Structure:
Chemical Name:
2-Phenylquinoline
CAS:
612-96-4
MF:
C15H11N
Structure:
Chemical Name:
5-CARBETHOXY-2-THIOURACIL
CAS:
38026-46-9
MF:
C7H8N2O3S
Structure:
Chemical Name:
4-Amino-2-ethoxypyridine
CAS:
89943-12-4
MF:
C7H10N2O
Structure:
Chemical Name:
3-Methyl-2-pyridone
CAS:
1003-56-1
MF:
C6H7NO
Structure:
Chemical Name:
3-Bromo-5-methylpyridine
CAS:
3430-16-8
MF:
C6H6BrN
Structure:
Chemical Name:
IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID
CAS:
133427-08-4
MF:
C8H6N2O2
Structure:
Chemical Name:
2,4-DICHLORO-7H-PYRROLO2,3-DPYRIMIDINE
CAS:
90213-66-4
MF:
C6H3Cl2N3
Structure:
Chemical Name:
3-Bromo-5-hydroxypyridine
CAS:
74115-13-2
MF:
C5H4BrNO
Structure:
Chemical Name:
4-Chloro-2-hydroxypyridine
CAS:
40673-25-4
MF:
C5H4ClNO
Structure:
Chemical Name:
2-BROMO-5-NITRO-6-PICOLINE
CAS:
22282-96-8
MF:
C6H5BrN2O2
Structure:
Chemical Name:
2-Chloro-4-methyl-5-nitropyridine
CAS:
23056-33-9
MF:
C6H5ClN2O2
Structure:
Chemical Name:
5-Ethyl-2-methylpyridine
CAS:
104-90-5
MF:
C8H11N
Structure:
Chemical Name:
2,4-Dichloro-5-aminopyrimidine
CAS:
5177-27-5
MF:
C4H3Cl2N3
Structure:
Chemical Name:
3-Amino-2-bromo-5-fluoropyridine
CAS:
884495-03-8
MF:
C5H4BrFN2
Structure:
Chemical Name:
3-Bromoimidazo[1,2-a]pyrimidine
CAS:
6840-45-5
MF:
C6H4BrN3
Structure:
Chemical Name:
3-CHLORO-6-PHENYLPYRIDAZINE
CAS:
20375-65-9
MF:
C10H7ClN2
Structure:
Chemical Name:
Clopyralid
CAS:
1702-17-6
MF:
C6H3Cl2NO2
Structure:
Chemical Name:
6-Chloroimidazo[2,1-f]pyridazine
CAS:
6775-78-6
MF:
C6H4ClN3
Structure:
Chemical Name:
3,6-Dihydroxy-4-methylpyridazine
CAS:
5754-18-7
MF:
C5H6N2O2
Structure:
Chemical Name:
2,3,4,6-Tetra-O-benzyl-D-glucopyranose
CAS:
4132-28-9
MF:
C34H36O6
Structure:
Chemical Name:
5-BROMO-2,3-DIFLUOROPYRIDINE
CAS:
89402-44-8
MF:
C5H2BrF2N
Structure:
Chemical Name:
5-Amino-2-chloro-3-picoline
CAS:
38186-82-2
MF:
C6H7ClN2
Structure:
Chemical Name:
4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate
CAS:
65802-56-4
MF:
C4H7N3O2S
Structure:
Chemical Name:
2-AMINO-5,6-DIMETHYL-4-HYDROXYPYRIMIDINE
CAS:
3977-23-9
MF:
C6H9N3O
Structure:
Chemical Name:
4,6-DIAMINO-2-METHYLMERCAPTOPYRIMIDINE
CAS:
1005-39-6
MF:
C5H8N4S
Structure:
Chemical Name:
2-Bromo-3-chloropyridine
CAS:
96424-68-9
MF:
C5H3BrClN
Structure:
Chemical Name:
4,6-Dimethoxy-2-methylthiopyrimidine
CAS:
90905-46-7
MF:
C7H10N2O2S
Structure:
Chemical Name:
2-CHLORO-3-FLUORO-4-IODOPYRIDINE
CAS:
148639-07-0
MF:
C5H2ClFIN
Structure:
Chemical Name:
2-Chloro-6-pyrazinecarboxylic acid methyl ester
CAS:
23611-75-8
MF:
C6H5ClN2O2
Structure:
Chemical Name:
2-Amino-4,6-dimethylpyrimidine
CAS:
767-15-7
MF:
C6H9N3
Structure:
Chemical Name:
2-CYANO-4-NITROPYRIDINE
CAS:
19235-88-2
MF:
C6H3N3O2
Structure:
Chemical Name:
2-AMINO-6-CHLORO-3-NITROPYRIDINE
CAS:
136901-10-5
MF:
C5H4ClN3O2
Structure:
Chemical Name:
2-Methoxynicotinic acid
CAS:
16498-81-0
MF:
C7H7NO3
Structure:
Chemical Name:
5-BROMO-2-HYDROXY-4-METHYLPYRIDINE
CAS:
164513-38-6
MF:
C6H6BrNO
Structure:
Chemical Name:
2-Fluoro-5-bromo-3-methylpyridine
CAS:
29312-98-9
MF:
C6H5BrFN
Structure:
Chemical Name:
2-FLUORO-3-METHYLPYRIDINE-5-BORONIC ACID
CAS:
904326-92-7
MF:
C6H7BFNO2
Structure:
Chemical Name:
5-Ethylpyridine-2,3-dicarboxylic acid diethyl ester
CAS:
105151-39-1
MF:
C13H17NO4
Structure:
Chemical Name:
Kojic acid
CAS:
501-30-4
MF:
C6H6O4
Structure:
Chemical Name:
2-Chloropyrimidine
CAS:
1722-12-9
MF:
C4H3ClN2
Structure:
Chemical Name:
5-HYDROXY-2-METHOXYPYRIDINE
CAS:
51834-97-0
MF:
C6H7NO2
Structure:
Chemical Name:
N-Methylpyrrole-2-carboxylic acid
CAS:
6973-60-0
MF:
C6H7NO2
Structure:
Chemical Name:
2-Amino-5-iodopyridine
CAS:
20511-12-0
MF:
C5H5IN2
Structure:
Chemical Name:
5-Bromo-2-iodopyrimidine
CAS:
183438-24-6
MF:
C4H2BrIN2
Structure:
Chemical Name:
2,5-Dibromopyridine
CAS:
624-28-2
MF:
C5H3Br2N
Structure:
Chemical Name:
4-AMINO-3-HYDROXY PYRIDINE
CAS:
52334-53-9
MF:
C5H6N2O
Structure:
Chemical Name:
2-ACETYL-5-CHLOROTHIOPHENE
CAS:
6310-09-4
MF:
C6H5ClOS
Structure:
Chemical Name:
5-FLUORO-2-HYDROXY-3-NITROPYRIDINE
CAS:
136888-20-5
MF:
C5H3FN2O3
Structure:
Chemical Name:
3-(2-Chloroethyl)-2-methylpyrido[1,2-a]pyrimidin-4-one
CAS:
41078-70-0
MF:
C11H11ClN2O
Structure:
Chemical Name:
5-Amino-2-hydroxypyridine
CAS:
33630-94-3
MF:
C5H6N2O
Structure:
Chemical Name:
4-Amino-2-chloro-3-nitropyridine
CAS:
2789-25-5
MF:
C5H4ClN3O2
Structure:
Chemical Name:
2-Chloro-5-nitropyrimidine
CAS:
10320-42-0
MF:
C4H2ClN3O2
Structure:
Chemical Name:
2-Chloro-4-hydroxypyridine
CAS:
17368-12-6
MF:
C5H4ClNO
Structure:
Chemical Name:
3,4,5-TRICHLOROPYRIDAZINE
CAS:
14161-11-6
MF:
C4HCl3N2
Structure:
Chemical Name:
5,6,7,8-Tetrahydroquinolin-8-ol
CAS:
14631-46-0
MF:
C9H11NO
Structure:
Chemical Name:
2-Amino-6-methoxypyridine
CAS:
17920-35-3
MF:
C6H8N2O
Structure:
Chemical Name:
2-Methoxypyridin-3-amine
CAS:
20265-38-7
MF:
C6H8N2O
Structure:
Chemical Name:
2-Chloro-3-methyl-5-nitropyridine
CAS:
22280-56-4
MF:
C6H5ClN2O2
Structure:
Chemical Name:
2,5-DIBROMO-3-BUTYLTHIOPHENE
CAS:
116971-10-9
MF:
C8H10Br2S
Structure:
Chemical Name:
2-Amino-5-bromo-4,6-dimethylpyrimidine
CAS:
4214-57-7
MF:
C6H8BrN3
Structure:
Chemical Name:
5-Bromo-2-methylpyridine
CAS:
3430-13-5
MF:
C6H6BrN