Pyridine compound Pyran compounds Pyridazine compounds Pyrimidines Piperazine compounds Quinoline compounds Pyrazines Isoquinoline compounds Thiophene compounds
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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-Amino-4-(trifluoromethyl)pyridine
CAS:
106447-97-6
MF:
C6H5F3N2
Structure:
Chemical Name:
2-Amino-4-chloropyridine
CAS:
19798-80-2
MF:
C5H5ClN2
Structure:
Chemical Name:
2-Amino-5-bromo-3-nitropyridine
CAS:
6945-68-2
MF:
C5H4BrN3O2
Structure:
Chemical Name:
4,6-Dimethoxypyrimidine
CAS:
5270-94-0
MF:
C6H8N2O2
Structure:
Chemical Name:
3-CHLORO-2-METHOXY-5-(TRIFLUOROMETHYL)PYRIDINE
CAS:
175136-17-1
MF:
C7H5ClF3NO
Structure:
Chemical Name:
3-CHLOROISONICOTINALDEHYDE
CAS:
72990-37-5
MF:
C6H4ClNO
Structure:
Chemical Name:
5-BROMO-2-HYDROXY-3-PICOLINE
CAS:
89488-30-2
MF:
C6H6BrNO
Structure:
Chemical Name:
2-HYDROXY-4-PYRIDINECARBOXALDEHYDE
CAS:
188554-13-4
MF:
C6H5NO2
Structure:
Chemical Name:
(R)-2,5-Dihydro-3,6-dimethoxy-2-isopropylpyrazine
CAS:
109838-85-9
MF:
C9H16N2O2
Structure:
Chemical Name:
2-Chloro-6-trifluoromethylnicotinic acid
CAS:
280566-45-2
MF:
C7H3ClF3NO2
Structure:
Chemical Name:
4-Amino-2-chloro-5-fluoropyrimidine
CAS:
155-10-2
MF:
C4H3ClFN3
Structure:
Chemical Name:
Homopiperazine
CAS:
505-66-8
MF:
C5H12N2
Structure:
Chemical Name:
4-NITRO-PYRIDIN-2-YLAMINE
CAS:
4487-50-7
MF:
C5H5N3O2
Structure:
Chemical Name:
5-Bromo-2-methyl-3-nitropyridine
CAS:
911434-05-4
MF:
C6H5BrN2O2
Structure:
Chemical Name:
2,5-DIBROMOTHIENO[3,2-B]THIOPHENE
CAS:
25121-87-3
MF:
C6H2Br2S2
Structure:
Chemical Name:
3,6-DIBROMOTHIENO[3,2-B]THIOPHENE
CAS:
392662-65-6
MF:
C6H2Br2S2
Structure:
Chemical Name:
N-(4,6-DIMETHYLPYRIMIDIN-2-YL)BENZENE-1,4-DIAMINE
CAS:
99931-82-5
MF:
C8H11BrN4
Structure:
Chemical Name:
2-BROMO-5-CHLORO-3-NITROPYRIDINE
CAS:
75806-86-9
MF:
C5H2BrClN2O2
Structure:
Chemical Name:
4-Methylnicotinic acid
CAS:
3222-50-2
MF:
C7H7NO2
Structure:
Chemical Name:
2-Amino-3-bromo-5-nitropyridine
CAS:
15862-31-4
MF:
C5H4BrN3O2
Structure:
Chemical Name:
4-Amino-2-bromopyrimidine-5-carbonitrile
CAS:
94741-70-5
MF:
C5H3BrN4
Structure:
Chemical Name:
Imidazo[1,2-a]pyridine
CAS:
274-76-0
MF:
C7H6N2
Structure:
Chemical Name:
8-Bromomethylquinoline
CAS:
7496-46-0
MF:
C10H8BrN
Structure:
Chemical Name:
2,4-Dihydroxypyridine
CAS:
626-03-9
MF:
C5H5NO2
Structure:
Chemical Name:
2-AMINO-4-CHLORO-6-HYDROXY-5-NITROPYRIMIDINE
CAS:
1007-99-4
MF:
C4H3ClN4O3
Structure:
Chemical Name:
4-Nitro-2,3-lutidine-N-oxide
CAS:
37699-43-7
MF:
C7H8N2O3
Structure:
Chemical Name:
2-HYDROXY-4-HYDRAZINO-PYRIMIDINE
CAS:
3310-41-6
MF:
C4H6N4O
Structure:
Chemical Name:
3-Bromo-2-pyridinamine
CAS:
13534-99-1
MF:
C5H5BrN2
Structure:
Chemical Name:
3-Amino-5-fluoropyridine
CAS:
210169-05-4
MF:
C5H5FN2
Structure:
Chemical Name:
4-CHLORO-5H-PYRROLO[3,2-D] PYRIMIDINE
CAS:
84905-80-6
MF:
C6H4ClN3
Structure:
Chemical Name:
2-Dimethylaminopyridine
CAS:
5683-33-0
MF:
C7H10N2
Structure:
Chemical Name:
5-BROMO-2-METHYLPYRIDIN-3-AMINE
CAS:
914358-73-9
MF:
C6H7BrN2
Structure:
Chemical Name:
5,6-DIBROMOPYRIDINE-3-CARBOXYLIC ACID
CAS:
29241-64-3
MF:
C6H3Br2NO2
Structure:
Chemical Name:
2-Vinylpyridine
CAS:
100-69-6
MF:
C7H7N
Structure:
Chemical Name:
3-Hydroxypyridine
CAS:
109-00-2
MF:
C5H5NO
Structure:
Chemical Name:
4-Bromo-2,6-diaminopyridine
CAS:
329974-09-6
MF:
C5H6BrN3
Structure:
Chemical Name:
6-Chloro-2,3-diaminopyridine
CAS:
40851-95-4
MF:
C5H6ClN3
Structure:
Chemical Name:
2,3-Dibromo-5-fluoropyridine
CAS:
878207-82-0
MF:
C5H2Br2FN
Structure:
Chemical Name:
4-IODO-2-METHOXYPYRIDINE
CAS:
98197-72-9
MF:
C6H6INO
Structure:
Chemical Name:
2-{[4-(3-Methoxypropoxy)-3-methylpyridine-2-yl]methylthio}-1H-benzimidazole
CAS:
117977-21-6
MF:
C18H21N3O2S
Structure:
Chemical Name:
6-Bromopyridine-2-boronic acid pinacol ester
CAS:
651358-83-7
MF:
C11H15BBrNO2
Structure:
Chemical Name:
2-Bromopyridine N-oxide hydrobromide
CAS:
206860-49-3
MF:
C5H5Br2NO
Structure:
Chemical Name:
6-Chloropyrazine-2-carboxylic acid
CAS:
23688-89-3
MF:
C5H3ClN2O2
Structure:
Chemical Name:
3-Chloro-6-iodopyridazine
CAS:
135034-10-5
MF:
C4H2ClIN2
Structure:
Chemical Name:
2-Cyano-5-nitropyridine
CAS:
100367-55-3
MF:
C6H3N3O2
Structure:
Chemical Name:
5-Hydroxymethyluracil
CAS:
4433-40-3
MF:
C5H6N2O3
Structure:
Chemical Name:
4-Iodopyridine
CAS:
15854-87-2
MF:
C5H4IN
Structure:
Chemical Name:
6-Chloropyridazin-3-ol
CAS:
19064-67-6
MF:
C4H3ClN2O
Structure:
Chemical Name:
6-AMINO-5-METHYLNICOTINONITRILE
CAS:
183428-91-3
MF:
C7H7N3
Structure:
Chemical Name:
4,6-Dimethyl-2-hydroxypyrimidine
CAS:
108-79-2
MF:
C6H8N2O
Structure:
Chemical Name:
5-IODO-6-METHYL-PYRIDIN-2-YLAMINE
CAS:
75073-11-9
MF:
C6H7IN2
Structure:
Chemical Name:
2,3,5-Trifluoropyridine
CAS:
76469-41-5
MF:
C5H2F3N
Structure:
Chemical Name:
2-AMINO-5-CHLORO-3-PICOLINE
CAS:
20712-16-7
MF:
C6H7ClN2
Structure:
Chemical Name:
2-Aminopyridine-5-boronic acid, pinacol ester
CAS:
827614-64-2
MF:
C11H17BN2O2
Structure:
Chemical Name:
6-CHLOROPYRIDINE-2-BORONIC ACID PINACOL ESTER
CAS:
652148-92-0
MF:
C11H15BClNO2
Structure:
Chemical Name:
7-BROMO-1-CHLOROISOQUINOLINE
CAS:
215453-51-3
MF:
C9H5BrClN
Structure:
Chemical Name:
PYRIMIDINE-4-CARBOXALDEHYDE
CAS:
2435-50-9
MF:
C5H4N2O
Structure:
Chemical Name:
3-BROMO-2-FLUORO-6-PICOLINE
CAS:
375368-78-8
MF:
C6H5BrFN
Structure:
Chemical Name:
1-Ethylpiperazine
CAS:
5308-25-8
MF:
C6H14N2
Structure:
Chemical Name:
2-Bromo-3-nitropyridine
CAS:
19755-53-4
MF:
C5H3BrN2O2
Structure:
Chemical Name:
5-Bromouracil
CAS:
51-20-7
MF:
C4H3BrN2O2
Structure:
Chemical Name:
4-Amino-3-nitropyridine
CAS:
1681-37-4
MF:
C5H5N3O2
Structure:
Chemical Name:
6-AMINO-2-METHYLQUINOLINE
CAS:
65079-19-8
MF:
C10H10N2
Structure:
Chemical Name:
3-Ethylpyridine
CAS:
536-78-7
MF:
C7H9N
Structure:
Chemical Name:
6-ISOPROPYLQUINOLINE
CAS:
135-79-5
MF:
C12H13N
Structure:
Chemical Name:
3,4,5-Trichloropyridine
CAS:
33216-52-3
MF:
C5H2Cl3N
Structure:
Chemical Name:
2,4-DIAMINO-6-HYDROXY-5-NITROSOPYRIMIDINE
CAS:
2387-48-6
MF:
C4H5N5O2
Structure:
Chemical Name:
4,6-Dimethoxy-2-methylpyrimidine
CAS:
13566-48-8
MF:
C7H10N2O2
Structure:
Chemical Name:
5-Azacytosine
CAS:
931-86-2
MF:
C3H4N4O
Structure:
Chemical Name:
6-Chloro-2-methyl-3-nitropyridine
CAS:
22280-60-0
MF:
C6H5ClN2O2
Structure:
Chemical Name:
2,4,6-Trichloropyrimidine
CAS:
3764-01-0
MF:
C4HCl3N2
Structure:
Chemical Name:
Methyl 4-aminopyridine-3-carboxylate
CAS:
16135-36-7
MF:
C7H8N2O2
Structure:
Chemical Name:
3-Amino-6-fluoro-2-methylpyridine
CAS:
28489-47-6
MF:
C6H7FN2
Structure:
Chemical Name:
4-HYDROXY-1-METHYL-2-QUINOLONE
CAS:
1677-46-9
MF:
C10H9NO2
Structure:
Chemical Name:
5-BROMOPYRIMIDINE-2-CARBOXYLIC ACID
CAS:
37131-87-6
MF:
C5H3BrN2O2
Structure:
Chemical Name:
4,6-Diaminopyrimidine
CAS:
2434-56-2
MF:
C4H6N4
Structure:
Chemical Name:
2-Chloro-5-fluoronicotinic acid
CAS:
38186-88-8
MF:
C6H3ClFNO2
Structure:
Chemical Name:
2-Amino-5-bromo-4-methyl-3-nitropyridine
CAS:
100367-40-6
MF:
C6H6BrN3O2
Structure:
Chemical Name:
2-Chloro-4,6-dimethylpyridine
CAS:
30838-93-8
MF:
C7H8ClN
Structure:
Chemical Name:
2-Amino-3-nitro-6-picoline
CAS:
21901-29-1
MF:
C6H7N3O2
Structure:
Chemical Name:
2,4-DIBROMOPYRIMIDINE
CAS:
3921-01-5
MF:
C4H2Br2N2
Structure:
Chemical Name:
4,6-Dichloro-2-(methylsulfonyl)pyrimidine
CAS:
4489-34-3
MF:
C5H4Cl2N2O2S
Structure:
Chemical Name:
2-Amino-3-nitro-4-picoline
CAS:
6635-86-5
MF:
C6H7N3O2
Structure:
Chemical Name:
3-AMINO-2-CHLOROPYRIDINE
CAS:
94770-75-9
MF:
C5H5ClN2.ClH
Structure:
Chemical Name:
5-Hydroxypyrazine-2-carboxylic acid
CAS:
34604-60-9
MF:
C5H4N2O3
Structure:
Chemical Name:
3,4-Diaminopyridine
CAS:
54-96-6
MF:
C5H7N3
Structure:
Chemical Name:
6-Methylpyridine-2-carbonitrile
CAS:
1620-75-3
MF:
C7H6N2
Structure:
Chemical Name:
5-BROMO-2,3-DIHYDRO-1H-PYRROLO[2,3-B]PYRIDINE
CAS:
115170-40-6
MF:
C7H7BrN2
Structure:
Chemical Name:
2-Methylthio-4-pyrimidinol
CAS:
5751-20-2
MF:
C5H6N2OS
Structure:
Chemical Name:
5-FLUORO-4-HYDROXYQUINAZOLINE
CAS:
436-72-6
MF:
C8H5FN2O
Structure:
Chemical Name:
3,5-BIS(METHYLSULFONYL)ANILINE
CAS:
101990-69-6
MF:
C6H5Cl2NO
Structure:
Chemical Name:
5-Amino-2-methylpyridine
CAS:
3430-14-6
MF:
C6H8N2
Structure:
Chemical Name:
4-Nitropyridine N-oxide
CAS:
1124-33-0
MF:
C5H4N2O3
Structure:
Chemical Name:
4-CHLORO-2-METHYLPYRIMIDINE
CAS:
4994-86-9
MF:
C5H5ClN2
Structure:
Chemical Name:
3-BROMOPYRIDINE-2-CARBOXYLIC ACID
CAS:
30683-23-9
MF:
C6H4BrNO2
Structure:
Chemical Name:
PYRIDINE-2-CARBOXAMIDE
CAS:
1452-77-3
MF:
C6H6N2O
Structure:
Chemical Name:
2-(2-Hydroxyethyl)pyridine
CAS:
103-74-2
MF:
C7H9NO
Structure:
Chemical Name:
4-Amino-6-chloro-2-methylpyrimidine
CAS:
1749-68-4
MF:
C5H6ClN3
Structure:
Chemical Name:
6-Aminothiouracil
CAS:
1004-40-6
MF:
C4H5N3OS
Structure:
Chemical Name:
4,6-Dichloro-5-methylpyrimidine
CAS:
4316-97-6
MF:
C5H4Cl2N2