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:
BUTTPARK 19\09-05
CAS:
43024-61-9
MF:
C9H9N3O3
Structure:
Chemical Name:
2-AZETIDIN-1-YL-5-BROMO-PYRIMIDINE
CAS:
850349-22-3
MF:
C7H8BrN3
Structure:
Chemical Name:
3-AMINO-4-METHYL-PYRIDAZINE
CAS:
90568-15-3
MF:
C5H7N3
Structure:
Chemical Name:
3H-TRIAZOLO[4,5-B]PYRIDINE, 6-BROMO-
CAS:
92276-38-5
MF:
C5H3BrN4
Structure:
Chemical Name:
3-(TRIMETHYLSILYL)PYRIDINE-4-CARBONITRILE
CAS:
17379-38-3
MF:
C9H12N2Si
Structure:
Chemical Name:
METHYL 2-IODO-3-PYRIDINECARBOXYLATE
CAS:
913836-18-7
MF:
C7H6INO2
Structure:
Chemical Name:
GAMMA-CHLORO-2-BUTYROTHIENONE
CAS:
43076-59-1
MF:
C8H9ClOS
Structure:
Chemical Name:
BOC-D-ASP-OTBU
CAS:
77004-75-2
MF:
C13H23NO6
Structure:
Chemical Name:
2-HYDROXY-5-IODO-6-METHYLPYRIDINE
CAS:
927870-76-6
MF:
C6H6INO
Structure:
Chemical Name:
3,5-DICHLORO-4-FLUOROPYRIDINE
MF:
C5H2Cl2FN
Structure:
Chemical Name:
2-FLUORO-6-METHYLPYRIDINE-3-BORONIC ACID
MF:
C6H7BFNO2
Structure:
Chemical Name:
6-AMINOQUINOLINE HYDROCHLORIDE
CAS:
53472-17-6
MF:
C9H9ClN2
Structure:
Chemical Name:
6-Mercaptonicotinic acid
CAS:
92823-43-3
MF:
C6H5NO2S
Structure:
Chemical Name:
2-PYRIDYLDITHIOCARBAMIC ACID ETHYL ESTER
CAS:
13037-05-3
MF:
C8H10N2S2
Structure:
Chemical Name:
5-BROMO-2-(ISOPROPYLAMINO)PYRIMIDINE
CAS:
77476-95-0
MF:
C7H10BrN3
Structure:
Chemical Name:
(2-CHLORO-PYRIDIN-3-YL)-OXO-ACETIC ACID ETHYL ESTER
CAS:
902837-56-3
MF:
C9H8ClNO3
Structure:
Chemical Name:
SALICYLIDENE 2-AMINOPYRIDINE
CAS:
1823-47-8
MF:
C12H10N2O
Structure:
Chemical Name:
3,4-DICHLOROPYRIDINE HCL
CAS:
159732-45-3
MF:
C5H4Cl3N
Structure:
Chemical Name:
7-HYDROXYCOUMARIN-3-CARBOXYLIC ACID
CAS:
779-27-1
MF:
C10H6O5
Structure:
Chemical Name:
2-Acetylamino-5-bromo-3-methylpyridine
CAS:
142404-81-7
MF:
C8H9BrN2O
Structure:
Chemical Name:
ALPHA-OCTITHIOPHENE
CAS:
113728-71-5
MF:
C32H18S8
Structure:
Chemical Name:
2,5-DIAMINO-4-PICOLINE
CAS:
6909-93-9
MF:
C6H9N3
Structure:
Chemical Name:
6-(Chloromethyl)-2-phenylpyrimidin-4-ol
CAS:
35252-98-3
MF:
C11H9ClN2O
Chemical Name:
3-FLUOROPYRIDIN-34-YLBORONIC ACID
Chemical Name:
2,2'-ANHYDRO-(-D-ARABINOFURANOSYL)CYTIDINE
MF:
C9H12N3O4
Structure:
Chemical Name:
BENZYL-(2-METHYLSULFANYL-PYRIMIDIN-4-YL)-AMINE
CAS:
91719-61-8
MF:
C12H13N3S
Structure:
Chemical Name:
4,6-DIHYDROXY-2-METHOXYPYRIMIDINE
CAS:
1758-98-1
MF:
C5H6N2O3
Structure:
Chemical Name:
THIENO[3,2-B]THIOPHENE-2-CARBOXYLIC ACID
CAS:
1723-27-9
MF:
C7H4O2S2
Structure:
Chemical Name:
(3-AMINO-PYRIDIN-4-YL)-METHANOL
CAS:
152398-05-5
MF:
C6H8N2O
Structure:
Chemical Name:
2,3,5,6-TETRAFLUORO-4-PYRIDINE-CARBONITRILE
CAS:
16297-07-7
MF:
C6F4N2
Structure:
Chemical Name:
2-AMINO-3-CHLOROMETHYL PYRIDINE
CAS:
858431-29-5
MF:
C6H7ClN2
Structure:
Chemical Name:
3-(PYRIMIDIN-2-YL)BROMOBENZENE
CAS:
885468-36-0
MF:
C10H7BrN2
Structure:
Chemical Name:
4,6-DIPHENYL-1,2,3,4-TETRAHYDROPYRIMIDINE-2-THIONE
CAS:
6381-55-1
MF:
C16H14N2S
Structure:
Chemical Name:
2-MORPHOLINO-4,6-DIFLUORO-PYRIMIDINE
CAS:
189003-02-9
MF:
C8H9F2N3O
Structure:
Chemical Name:
4-AMINOMETHYL-PYRIDIN-3-YLAMINE
CAS:
144288-49-3
MF:
C6H9N3
Structure:
Chemical Name:
2-AMINO-4-HYDROXY-6-ISOPROPYLPYRIMIDINE
CAS:
73576-32-6
MF:
C7H11N3O
Structure:
Chemical Name:
2-FLUORO-3-NITRO-5-BROMO PYRIDINE
CAS:
886372-98-1
MF:
C5H2BrFN2O2
Structure:
Chemical Name:
1-BENZYL-4-METHYL-1,2,3,6-TETRAHYDRO-PYRIDINE
CAS:
32018-56-7
MF:
C13H17N
Structure:
Chemical Name:
2-CHLORO-5-IODO-3-METHYLPYRIDINE
CAS:
59782-89-7
MF:
C6H5ClIN
Structure:
Chemical Name:
4-methyl-2-pyrid-4-yl-1,3-thiazole-5-carboxylic acid
CAS:
144060-98-0
MF:
C10H8N2O2S
Structure:
Chemical Name:
tert-Butyl 4-(4-cyanopyrid-2-yl)piperazine-1-carboxylate
CAS:
884507-31-7
MF:
C15H20N4O2
Structure:
Chemical Name:
6-Amino-3(2H)-pyridazinone
CAS:
10071-13-3
MF:
C4H5N3O
Structure:
Chemical Name:
1,5,6,7-Tetrahydro-4-hydroxy-2H-cyclopenta[b]pyridin-2-one
CAS:
55618-81-0
MF:
C8H9NO2
Structure:
Chemical Name:
5-bromo-1H,5H-pyrimidine-4,6-dione
CAS:
52176-13-3
MF:
C4H3BrN2O2
Structure:
Chemical Name:
thiophene-3-thiol
CAS:
7774-73-4
MF:
C4H4S2
Structure:
Chemical Name:
2-Fluoro-3-Iodo-6-Methylpyridine
MF:
C6H5FIN
Structure:
Chemical Name:
8-Chlorotetrazolo[1,5-a]pyridine
CAS:
40971-88-8
MF:
C5H3ClN4
Structure:
Chemical Name:
4-Chloro-2-methyl-6-(pyrrolidin-1-yl)pyrimidine
CAS:
914349-69-2
MF:
C9H12ClN3
Structure:
Chemical Name:
5-Bromo-2-chloropyridine-3-boronic acid
CAS:
1072944-19-4
MF:
C5H4BBrClNO2
Structure:
Chemical Name:
2-Cyano-3,5-dimethylpyridine
CAS:
7584-09-0
MF:
C8H8N2
Structure:
Chemical Name:
2-Cyano-4-fluoropyridine
CAS:
847225-56-3
MF:
C6H3FN2
Structure:
Chemical Name:
2-Methyl-3-nitropyridine-6-carboxylic acid
CAS:
24194-98-7
MF:
C7H6N2O4
Structure:
Chemical Name:
2-Chloro-4-Bromo-3-Picoline
CAS:
128071-86-3
MF:
C6H5BrClN
Structure:
Chemical Name:
3,4-Dichloro-2-Picoline
CAS:
103949-58-2
MF:
C6H5Cl2N
Structure:
Chemical Name:
ETHYL 4-HYDROXY-6-METHYL-2-OXO-1,2-DIHYDROPYRIDINE-3-CARBOXYLATE
CAS:
10350-10-4
MF:
C9H11NO4
Structure:
Chemical Name:
2-AMINO-3-BROMO-5,6-DIMETHYLPYRIDINE
CAS:
161091-49-2
MF:
C7H9BrN2
Structure:
Chemical Name:
4-METHYL-PYRIDINE-2,3-DIAMINE
CAS:
53929-59-2
MF:
C6H9N3
Structure:
Chemical Name:
6-METHYL-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER
CAS:
104408-25-5
MF:
C6H10ClN3
Structure:
Chemical Name:
1-Formylhomopiperazine
CAS:
29053-62-1
MF:
C6H12N2O
Structure:
Chemical Name:
Isoquinoline-4-carboxylic acid
CAS:
7159-36-6
MF:
C10H7NO2
Structure:
Chemical Name:
METHYL 3-METHOXYTHIOPHENE-2-CARBOXYLATE
CAS:
62353-75-7
MF:
C7H8O3S
Structure:
Chemical Name:
PYRAZINE-2,3-DICARBOXYLIC ACID MONOAMIDE
CAS:
67367-37-7
MF:
C6H5N3O3
Structure:
Chemical Name:
3,5-DIMETHYLPYRIDINE-N-OXIDE
CAS:
3718-65-8
MF:
C7H9NO
Structure:
Chemical Name:
6-METHYL-2-PHENYL-4(1H)PYRIMIDINONE
CAS:
13514-79-9
MF:
C11H10N2O
Structure:
Chemical Name:
2-CHLOROMETHYL-3,4-DIMETHOXY PYRIDINE HYDROCHLORIDE
CAS:
169905-10-6
MF:
C8H10ClNO2
Structure:
Chemical Name:
4-CHLORO-3(2H)-PYRIDAZINONE
CAS:
1677-79-8
MF:
C4H3ClN2O
Structure:
Chemical Name:
2,5-Dimethylpiperazine
CAS:
106-55-8
MF:
C6H14N2
Structure:
Chemical Name:
ETHYL-4-METHYL PYRIMIDINE-5-CARBOXYLATE
CAS:
110960-73-1
MF:
C8H10N2O2
Structure:
Chemical Name:
2-(AMINOMETHYL)-3-CHLORO-5-(TRIFLUOROMETHYL)-PYRIDINE HYDROCHLORIDE
CAS:
175277-74-4
MF:
C7H6ClF3N2
Structure:
Chemical Name:
N-(TETRAHYDRO-2H-PYRAN-2-YLOXY)SUCCINIMIDE
CAS:
55610-40-7
MF:
C9H13NO4
Structure:
Chemical Name:
3-CHLORO-2-HYDROXY-5-FORMYLPYRIDINE
CAS:
627501-18-2
MF:
C6H4ClNO2
Structure:
Chemical Name:
5-FLUORO-2-METHOXYISONICOTINIC ACID
CAS:
884495-30-1
MF:
C7H6FNO3
Structure:
Chemical Name:
2-METHOXY-4-(TRIFLUOROMETHYL)PYRIDINE-5-CARBOXAMIDE
CAS:
175204-87-2
MF:
C8H7F3N2O2
Structure:
Chemical Name:
1-(3,5-DICHLORO-2-PYRIDINYL)PIPERAZINE
MF:
C9H11Cl2N3
Structure:
Chemical Name:
2,6-DIFLUORO-4-CYANO-PYRIDINE
CAS:
51991-35-6
MF:
C6H2F2N2
Structure:
Chemical Name:
6,7-DIHYDRO-5H-ISOQUINOLIN-8-ONE
CAS:
21917-88-4
MF:
C9H9NO
Structure:
Chemical Name:
5-ACETAMIDO-2-BROMOPYRIDINE
CAS:
29958-19-8
MF:
C7H7BrN2O
Structure:
Chemical Name:
Tetrahydro-4H-Pyran-4-one
CAS:
143562-54-3
Structure:
Chemical Name:
7-Methylimidazo(1,2-a)pyridine
CAS:
874-39-5
MF:
C8H8N2
Structure:
Chemical Name:
3,5-DINITRO-4-HYDROXYPYRIDINE
CAS:
10425-71-5
MF:
C5H3N3O5
Structure:
Chemical Name:
4-Ethoxy-2-Fluoropyridine
CAS:
175965-82-9
MF:
C7H8FNO
Structure:
Chemical Name:
2-Fluoro-4-Bromo-3-Picoline
CAS:
128071-79-4
MF:
C6H5BrFN
Structure:
Chemical Name:
Pyrimidine, 2-(chloromethyl)-5-methyl
CAS:
126504-85-6
MF:
C6H7ClN2
Structure:
Chemical Name:
2-BENZYLAMINO-4-BENZYLOXY-5-BROMOPYRIMIDINE
CAS:
885952-25-0
MF:
C18H16BrN3O
Structure:
Chemical Name:
2-Methanesulfonyl-pyrimidine-4-carbaldehyde
CAS:
874279-27-3
MF:
C6H6N2O3S
Structure:
Chemical Name:
Ethanone, 1-(5-hydroxy-2-pyridinyl)- (9CI)
CAS:
67310-56-9
MF:
C7H7NO2
Structure:
Chemical Name:
2-(METHYLTHIO)-3-ETHYLPYRAZINE
CAS:
72987-62-3
MF:
C7H10N2S
Structure:
Chemical Name:
2-PHENOXYPYRIDINE
CAS:
4783-68-0
MF:
C11H9NO
Structure:
Chemical Name:
Pyridine, 4-(bromomethyl)- (9CI)
CAS:
54751-01-8
MF:
C6H6BrN
Structure:
Chemical Name:
2-BROMO-3-HYDROXYPYRIDINE-N-OXIDE
CAS:
6602-29-5
MF:
C5H4BrNO2
Structure:
Chemical Name:
(6-bromo-3H-imidazo[4,5-b]pyridin-2-yl)methanol
CAS:
172648-19-0
MF:
C7H6BrN3O
Structure:
Chemical Name:
4(1H)-Pyrimidinone, 2-methoxy- (9CI)
CAS:
25902-86-7
MF:
C5H6N2O2
Structure:
Chemical Name:
1-Pyrrolidineacetic acid, 3-hydroxy- (9CI)
CAS:
258530-57-3
MF:
C6H11NO3
Structure:
Chemical Name:
4-chlorofuro[2,3-d]pyrimidine
CAS:
918340-51-9
MF:
C6H3ClN2O
Structure:
Chemical Name:
2-Benzyloxy-pyridine-5-boronic acid
CAS:
929250-35-1
MF:
C12H12BNO3
Structure:
Chemical Name:
2-Bromo-3-fluoro-5-(trifluoromethyl)pyridine
CAS:
89402-29-9
MF:
C6H2BrF4N
Structure:
Chemical Name:
(S,S)-6-BENZYL-OCTAHYDRO-PYRROLO[3,4-B]PYRIDINE DIHYDROCHLORIDE
CAS:
151213-39-7
MF:
C14H20N2
Structure:
Chemical Name:
2-Chloro-6-(trifluoromethyl)pyrimidin-4-amine
CAS:
85730-36-5
MF:
C5H3ClF3N3
Structure:
Chemical Name:
6-Amino-1-benzyl-5-bromouracil
CAS:
72816-87-6
MF:
C11H10BrN3O2
Structure:
Chemical Name:
METHYLPYRIDIN-2-YLMETHYLAMINE DIHYDROCHLORIDE
CAS:
21035-59-6
MF:
C7H10N2