Pyridine compound Pyran compounds Pyridazine compounds Pyrimidines Piperazine compounds Quinoline compounds Pyrazines Isoquinoline compounds Thiophene compounds
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Heterocyclic compound

Pyridine compound Pyran compounds Pyridazine compounds Pyrimidines Piperazine compounds Quinoline compounds Pyrazines Isoquinoline compounds Thiophene compounds
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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:
4-Chlorophenethylamine
CAS:
156-41-2
MF:
C11H9ClN4
Structure:
Chemical Name:
2-Amino-5-chloropyrazine
CAS:
33332-29-5
MF:
C4H4ClN3
Structure:
Chemical Name:
3-Hexylthiophene
CAS:
1693-86-3
MF:
C10H16S
Structure:
Chemical Name:
Quinolin-2-amine
CAS:
580-22-3
MF:
C9H8N2
Structure:
Chemical Name:
6-Bromo-2-methylquinoline
CAS:
877-42-9
MF:
C10H8BrN
Structure:
Chemical Name:
Methyl 3-amino-4-methylthiophene-2-carboxylate
CAS:
85006-31-1
MF:
C7H9NO2S
Structure:
Chemical Name:
2,2'-Biquinoline
CAS:
119-91-5
MF:
C18H12N2
Structure:
Chemical Name:
2-HYDROXY-4-METHYLQUINOLINE
CAS:
607-66-9
MF:
C10H9NO
Structure:
Chemical Name:
4-Chloro-7-methoxyquinoline
CAS:
68500-37-8
MF:
C10H8ClNO
Structure:
Chemical Name:
2-Amino-3-chloropyrazine
CAS:
6863-73-6
MF:
C4H4ClN3
Structure:
Chemical Name:
2,8-BIS(TRIFLUOROMETHYL)-4-CHLOROQUINOLINE
CAS:
83012-13-9
MF:
C11H4ClF6N
Structure:
Chemical Name:
3-Acetyl-2,5-dichlorothiophene
CAS:
36157-40-1
MF:
C6H4Cl2OS
Structure:
Chemical Name:
1-Hexadecylpyridinium bromide
CAS:
140-72-7
MF:
C21H38BrN
Structure:
Chemical Name:
7,8-BENZOQUINOLINE
CAS:
230-27-3
MF:
C13H9N
Structure:
Chemical Name:
8-Quinolineboronic acid
CAS:
86-58-8
MF:
C9H8BNO2
Structure:
Chemical Name:
2-Amino-5-bromopyrazine
CAS:
59489-71-3
MF:
C4H4BrN3
Structure:
Chemical Name:
Thiophene-3-ethanol
CAS:
13781-67-4
MF:
C6H8OS
Structure:
Chemical Name:
Thianaphthene
CAS:
95-15-8
MF:
C8H6S
Structure:
Chemical Name:
4-(Trifluoromethyl)nicotinic acid
CAS:
158063-66-2
MF:
C7H4F3NO2
Structure:
Chemical Name:
Pyridine hydrochloride
CAS:
628-13-7
MF:
C5H6ClN
Structure:
Chemical Name:
Quinoxaline
CAS:
91-19-0
MF:
C8H6N2
Structure:
Chemical Name:
8-Aminoisoquinoline
CAS:
23687-27-6
MF:
C9H8N2
Structure:
Chemical Name:
2-Hydroxynicotinic acid
CAS:
609-71-2
MF:
C6H5NO3
Structure:
Chemical Name:
4,4'-DIBROMO-2,2'-BIPYRIDINE
CAS:
18511-71-2
MF:
C10H6Br2N2
Structure:
Chemical Name:
3-Bromo-5-methoxypyridine
CAS:
50720-12-2
MF:
C6H6BrNO
Structure:
Chemical Name:
5-CHLORO-3-METHYLBENZO[B]THIOPHENE
CAS:
19404-18-3
MF:
C9H7ClS
Structure:
Chemical Name:
4-NITROQUINOLINE N-OXIDE
CAS:
56-57-5
MF:
C9H6N2O3
Structure:
Chemical Name:
1-METHYLISOQUINOLINE
CAS:
1721-93-3
MF:
C10H9N
Structure:
Chemical Name:
7-Methylquinoline
CAS:
612-60-2
MF:
C10H9N
Structure:
Chemical Name:
2-Bromo-6-methoxypyridine
CAS:
40473-07-2
MF:
C6H6BrNO
Structure:
Chemical Name:
Methyl 2-aminopyridine-4-carboxylate
CAS:
6937-03-7
MF:
C7H8N2O2
Structure:
Chemical Name:
2-Chlorothiophene
CAS:
96-43-5
MF:
C4H3ClS
Structure:
Chemical Name:
6,7-Dimethoxyquinazoline-2,4-dione
CAS:
28888-44-0
MF:
C10H10N2O4
Structure:
Chemical Name:
3-Methoxythiophene
CAS:
17573-92-1
MF:
C5H6OS
Structure:
Chemical Name:
6-CHLOROQUINOLINE
CAS:
612-57-7
MF:
C9H6ClN
Structure:
Chemical Name:
Methyl 3-amino-2-pyrazinecarboxylate
CAS:
16298-03-6
MF:
C6H7N3O2
Structure:
Chemical Name:
2,3-Dibromothiophene
CAS:
3140-93-0
MF:
C4H2Br2S
Structure:
Chemical Name:
1-Chloroisoquinoline
CAS:
19493-44-8
MF:
C9H6ClN
Structure:
Chemical Name:
4-CHLOROQUINOLINE
CAS:
611-35-8
MF:
C9H6ClN
Structure:
Chemical Name:
8-Chloroquinoline
CAS:
611-33-6
MF:
C9H6ClN
Structure:
Chemical Name:
2,2'-BITHIOPHENE
CAS:
492-97-7
MF:
C8H6S2
Structure:
Chemical Name:
Isocarbostyril
CAS:
491-30-5
MF:
C9H7NO
Structure:
Chemical Name:
8-Hydroxyquinoline-5-sulfonic acid
CAS:
84-88-8
MF:
C9H7NO4S
Structure:
Chemical Name:
ISOQUINOLINE N-OXIDE
CAS:
1532-72-5
MF:
C9H7NO
Structure:
Chemical Name:
6-Fluoroquinaldine
CAS:
1128-61-6
MF:
C10H8FN
Structure:
Chemical Name:
Pyrazine
CAS:
290-37-9
MF:
C4H4N2
Structure:
Chemical Name:
2-CHLOROQUINOLINE-3-CARBALDEHYDE
CAS:
73568-25-9
MF:
C10H6ClNO
Structure:
Chemical Name:
2,6-Pyridinedicarboxylic acid
CAS:
499-83-2
MF:
C7H5NO4
Structure:
Chemical Name:
Isonicotinic acid
CAS:
55-22-1
MF:
C6H5NO2
Structure:
Chemical Name:
2,5-Dibromothiophene
CAS:
3141-27-3
MF:
C4H2Br2S
Structure:
Chemical Name:
(2-Chloro-3-pyridinyl)methanol
CAS:
42330-59-6
MF:
C6H6ClNO
Structure:
Chemical Name:
2-Quinolinecarboxaldehyde
CAS:
5470-96-2
MF:
C10H7NO
Structure:
Chemical Name:
2-Thiophenecarboxylic acid
CAS:
527-72-0
MF:
C5H4O2S
Structure:
Chemical Name:
8-(TRIFLUOROMETHYL)QUINOLIN-4-OL
CAS:
23779-96-6
MF:
C10H6F3NO
Structure:
Chemical Name:
5-Nitroisoquinoline
CAS:
607-32-9
MF:
C9H6N2O2
Structure:
Chemical Name:
2,6-DIMETHYLQUINOLINE
CAS:
877-43-0
MF:
C11H11N
Structure:
Chemical Name:
3-Hydroxyisoquinoline
CAS:
7651-81-2
MF:
C9H7NO
Structure:
Chemical Name:
4-Acetylpyridine
CAS:
1122-54-9
MF:
C7H7NO
Structure:
Chemical Name:
3,5-Pyridinedicarboxylic acid
CAS:
499-81-0
MF:
C7H5NO4
Structure:
Chemical Name:
5-Bromopyridine-2-carboxylic acid
CAS:
30766-11-1
MF:
C6H4BrNO2
Structure:
Chemical Name:
2-Methyl-6-quinolinecarboxylic acid
CAS:
635-80-3
MF:
C11H9NO2
Structure:
Chemical Name:
2-Methoxy-5-pyridineboronic acid
CAS:
163105-89-3
MF:
C6H8BNO3
Structure:
Chemical Name:
6-Bromoisoquinoline
CAS:
34784-05-9
MF:
C9H6BrN
Structure:
Chemical Name:
8-Mercaptoquinoline hydrochloride
CAS:
34006-16-1
MF:
C9H8ClNS
Structure:
Chemical Name:
2-Amino-3-pyridinecarboxaldehyde
CAS:
7521-41-7
MF:
C6H6N2O
Structure:
Chemical Name:
6-Bromoquinoline
CAS:
5332-25-2
MF:
C9H6BrN
Structure:
Chemical Name:
6-Fluoronicotinic acid
CAS:
403-45-2
MF:
C6H4FNO2
Structure:
Chemical Name:
7-Bromoquinoline
CAS:
4965-36-0
MF:
C9H6BrN
Structure:
Chemical Name:
QUINOLINE-4-CARBOXYLIC ACID
CAS:
486-74-8
MF:
C10H7NO2
Structure:
Chemical Name:
Quinoline
CAS:
91-22-5
MF:
C9H7N
Structure:
Chemical Name:
6-NITROQUINOLINE
CAS:
613-50-3
MF:
C9H6N2O2
Structure:
Chemical Name:
4-CHLORO-8-(TRIFLUOROMETHYL)QUINOLINE
CAS:
23779-97-7
MF:
C10H5ClF3N
Structure:
Chemical Name:
Decahydroquinoline
CAS:
2051-28-7
MF:
C9H17N
Structure:
Chemical Name:
3-Pyridylacetic acid hydrochloride
CAS:
6419-36-9
MF:
C7H8ClNO2
Structure:
Chemical Name:
Nipecotic acid
CAS:
498-95-3
MF:
C6H11NO2
Structure:
Chemical Name:
4-Hydroxyquinoline
CAS:
611-36-9
MF:
C9H7NO
Structure:
Chemical Name:
8-Methylquinoline
CAS:
611-32-5
MF:
C10H9N
Structure:
Chemical Name:
N-Boc-3-pyrrolidinone
CAS:
101385-93-7
MF:
C9H15NO3
Structure:
Chemical Name:
3-Hydroxy-2-methyl-4-quinolinecarboxylic acid
CAS:
117-57-7
MF:
C11H9NO3
Structure:
Chemical Name:
6-Quinolinecarboxylic acid
CAS:
10349-57-2
MF:
C10H7NO2
Structure:
Chemical Name:
3-Quinolinecarboxaldehyde
CAS:
13669-42-6
MF:
C10H7NO
Structure:
Chemical Name:
2-Hydroxy-4-quinolincarboxylic acid
CAS:
15733-89-8
MF:
C10H7NO3
Structure:
Chemical Name:
5-Bromoisoquinoline
CAS:
34784-04-8
MF:
C9H6BrN
Structure:
Chemical Name:
3,4-Dibromothiophene
CAS:
3141-26-2
MF:
C4H2Br2S
Structure:
Chemical Name:
2-Bromopyridine-4-carboxylic acid
CAS:
66572-56-3
MF:
C6H4BrNO2
Structure:
Chemical Name:
2,4-DIMETHYLQUINOLINE
CAS:
1198-37-4
MF:
C11H11N
Structure:
Chemical Name:
2-Chloro-6-aminopyrazine
CAS:
33332-28-4
MF:
C4H4ClN3
Structure:
Chemical Name:
1-Isoquinolinecarbonitrile
CAS:
1198-30-7
MF:
C10H6N2
Structure:
Chemical Name:
2-Iodothiophene
CAS:
3437-95-4
MF:
C4H3IS
Structure:
Chemical Name:
6-BROMO-4-CHLOROQUINOLINE
CAS:
65340-70-7
MF:
C9H5BrClN
Structure:
Chemical Name:
5-Methyl-2-thiophenecarboxylic acid
CAS:
1918-79-2
MF:
C6H6O2S
Structure:
Chemical Name:
2,6-Dichloro-5-fluoronicotinic acid
CAS:
82671-06-5
MF:
C6H2Cl2FNO2
Structure:
Chemical Name:
2-(Hydroxymethyl)pyridine
CAS:
586-98-1
MF:
C6H7NO
Structure:
Chemical Name:
Aminopyrazine
CAS:
5049-61-6
MF:
C4H5N3
Structure:
Chemical Name:
2-Amino-5-methyl-3-thiophenecarbonitrile
CAS:
138564-58-6
MF:
C6H6N2S
Structure:
Chemical Name:
5-Bromothiophenesulfonyl chloride
CAS:
55854-46-1
MF:
C4H2BrClO2S2
Structure:
Chemical Name:
7-FLUORO-2-METHYLQUINOLINE
CAS:
1128-74-1
MF:
C10H8FN
Structure:
Chemical Name:
8-Bromoquinoline
CAS:
16567-18-3
MF:
C9H6BrN
Structure:
Chemical Name:
2-Methoxypyridine
CAS:
1628-89-3
MF:
C6H7NO
Structure:
Chemical Name:
6-(Trifluoromethyl)nicotinic acid
CAS:
231291-22-8
MF:
C7H4F3NO2