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:
(6-CHLORO-PYRIDIN-3-YL)-OXO-ACETIC ACID ETHYL ESTER
CAS:
902837-55-2
MF:
C9H8ClNO3
Structure:
Chemical Name:
6-CHLORO-2-METHOXYPYRIDIN-3-AMINE
CAS:
914222-86-9
MF:
C6H7ClN2O
Structure:
Chemical Name:
3-Cyano-1,2-dihydro-4-hydroxy-2-oxopyridine
CAS:
5657-64-7
MF:
C6H4N2O2
Structure:
Chemical Name:
8-Bromo-6-methylimidazo[1,2-a]pyridine
CAS:
136117-93-6
MF:
C8H7BrN2
Structure:
Chemical Name:
3,5-Dibromopyridine-4-boronic acid
CAS:
1310384-73-6
MF:
C5H4BBr2NO2
Structure:
Chemical Name:
3-Pyridazinecarboxylic acid, 6-chloro-,1-methylethyl ester
CAS:
321946-09-2
MF:
C8H9ClN2O2
Structure:
Chemical Name:
6-Chloro-2,3-diphenylimidazo[1,2-b]pyridazine
CAS:
873913-87-2
MF:
C18H12ClN3
Structure:
Chemical Name:
2-Cyano-6-methyl-4-nitropyridine
CAS:
30235-12-2
MF:
C7H5N3O2
Structure:
Chemical Name:
6-METHYL-3,4-PYRIDINEDIAMINE
CAS:
861199-62-4
MF:
C6H9N3
Structure:
Chemical Name:
5-HYDRAZINO-2-METHOXYPYRIDINE
CAS:
160664-95-9
MF:
C6H9N3O
Structure:
Chemical Name:
3,5-Dimethyl-4-nitropyridine 1-oxide
CAS:
14248-66-9
MF:
C7H8N2O3
Structure:
Chemical Name:
2-BROMO-6-METHOXY-3-NITRO-PYRIDINE
CAS:
344296-05-5
MF:
C6H5BrN2O3
Structure:
Chemical Name:
3,5-DICHLORO-4-IODOPYRIDINE, 97%
CAS:
343781-41-9
MF:
C5H2Cl2IN
Structure:
Chemical Name:
2-Amino-4,6-difluoromethoxypyrimidine
MF:
C5H5F2N3O
Structure:
Chemical Name:
2-Chloro-N-cyclohexyl-4-pyrimidinamine
CAS:
191729-06-3
MF:
C10H14ClN3
Structure:
Chemical Name:
3-Chloro-2,5-difluoropyridine
CAS:
851179-00-5
MF:
C5H2ClF2N
Structure:
Chemical Name:
3-Hydroxypyridine-4-carboxylic acid ethyl ester
CAS:
18342-97-7
MF:
C8H9NO3
Structure:
Chemical Name:
3-Iodopyridine-2-carboxylic acid
CAS:
73841-32-4
MF:
C6H4INO2
Structure:
Chemical Name:
4-(6-CHLORO-2-METHYLPYRIMIDIN-4-YL)MORPHOLINE
CAS:
22177-99-7
MF:
C9H12ClN3O
Structure:
Chemical Name:
5H-CYCLOPENTA[B]PYRIDIN-7-AMINE, 6,7-DIHYDRO-
CAS:
185122-75-2
MF:
C8H10N2
Structure:
Chemical Name:
5-(TERT-BUTYLSULFONYL)-2-(2-PYRIDYL)PYRIMIDIN-4-AMINE
CAS:
175202-19-4
MF:
C13H16N4O2S
Structure:
Chemical Name:
6-TERT-BUTYL-3H-THIENO[2,3-D]PYRIMIDIN-4-ONE
CAS:
439692-54-3
MF:
C10H12N2OS
Structure:
Chemical Name:
2-CHLORO-4-THIOCYANATOPYRIMIDINE
CAS:
854476-92-9
MF:
C5H2ClN3S
Structure:
Chemical Name:
6-CHLORO-N-ETHYL-2-(METHYLSULFANYL)-4-PYRIMIDINAMINE
CAS:
339017-83-3
MF:
C7H10ClN3S
Structure:
Chemical Name:
2-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE
CAS:
175277-89-1
MF:
C8H5F3N2O
Structure:
Chemical Name:
3-N-NONYLTHIOPHENE
CAS:
65016-63-9
MF:
C13H22S
Structure:
Chemical Name:
3-CYANOCHROMONE
CAS:
50743-17-4
MF:
C10H5NO2
Structure:
Chemical Name:
2-AMINO-3-FORMYLCHROMONE
CAS:
61424-76-8
MF:
C10H7NO3
Structure:
Chemical Name:
4'-(4-METHYLPHENYL)-2,2':6',2''-TERPYRIDINE
CAS:
89972-77-0
MF:
C22H17N3
Structure:
Chemical Name:
2-AMINO-4-TRIFLUOROMETHYL-PYRIMIDINE-5-CARBOXYLIC ACID
MF:
C6H4F3N3O2
Structure:
Chemical Name:
3-NITRO-6-PYRIDINEMETHANOL
CAS:
36625-57-7
MF:
C6H6N2O3
Structure:
Chemical Name:
6-NITRONICOTINIC ACID
CAS:
33225-73-9
MF:
C6H4N2O4
Structure:
Chemical Name:
2-METHOXY-6-METHYLPYRIDINE-3-BORONIC ACID
CAS:
1000802-75-4
MF:
C7H10BNO3
Structure:
Chemical Name:
3-THIOPHENECARBOXYLIC ACID N-BUTYL ESTER
CAS:
317385-62-9
MF:
C9H12O2S
Structure:
Chemical Name:
Benzyl 1-homopiperazine carboxylate
CAS:
117009-97-9
MF:
C13H18N2O2
Structure:
Chemical Name:
6-methyl-pyridine-2-carboxylic acid ethyl ester
CAS:
39640-51-2
MF:
C9H11NO2
Structure:
Chemical Name:
4-CHLOROPYRIDIN-3-YLBORONIC ACID, PINACOL ESTER 98
CAS:
452972-15-5
MF:
C11H15BClNO2
Structure:
Chemical Name:
3-CHLORO-6-FLUOROBENZOTHIOPHENE-2-CARBONYL CHLORIDE
CAS:
34576-83-5
MF:
C9H3Cl2FOS
Structure:
Chemical Name:
METHYL 2-METHOXYISONICOTINATE 97%METHYL 2-METHOXYPYRIDINE-4-CARBOXYLATE
CAS:
26156-51-4
MF:
C8H9NO3
Structure:
Chemical Name:
2-AMINO-4-METHYLNICOTINIC ACID,
CAS:
38076-82-3
MF:
C7H8N2O2
Structure:
Chemical Name:
2,2'-Bipyridine-4,4'-dicarboxaldehyde
CAS:
99970-84-0
MF:
C12H8N2O2
Structure:
Chemical Name:
LAURYL DIMETHYLAMINE OXIDE
CAS:
70592-80-2
MF:
C10H13Br2N
Structure:
Chemical Name:
2-AMINO-4-METHOXY-3-NITROPYRIDINE
CAS:
84487-08-1
MF:
C6H7N3O3
Structure:
Chemical Name:
3-METHYL-6-(1-METHYLHYDRAZINO)PYRIDAZINE
CAS:
175135-44-1
MF:
C6H10N4
Structure:
Chemical Name:
3-BROMO-2-FLUORO-5-CHLOROPYRIDINE
MF:
C5H2BrClFN
Structure:
Chemical Name:
ETHYL 2-HYDROXYPYRIMIDINE-5-CARBOXYLATE
MF:
C7H8N2O3
Structure:
Chemical Name:
6-Methyl-2-(methylthio)pyrimidin-4-ol
CAS:
6328-58-1
MF:
C6H8N2OS
Structure:
Chemical Name:
2-METHYL-1,5-NAPHTHYRIDINE
CAS:
7675-32-3
MF:
C9H8N2
Structure:
Chemical Name:
5-(4-FLUOROPHENYL)-2-PYRIDINAMINE
CAS:
503536-73-0
MF:
C11H9FN2
Structure:
Chemical Name:
(5-METHYLPYRIDIN-2-YL)METHANAMINE
CAS:
45715-08-0
MF:
C7H10N2
Structure:
Chemical Name:
2-Hydroxy-4(1H)-pyrimidinethione
CAS:
203268-53-5
MF:
C4H4N2OS
Structure:
Chemical Name:
4-Nitropyridine-2-carboxylic acid 1-oxide
CAS:
14933-78-9
MF:
C6H4N2O5
Structure:
Chemical Name:
1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one, monosodium salt
CAS:
17795-21-0
MF:
C5H5N4NaO
Structure:
Chemical Name:
4-Chloro-6,7-dihydro-5H-cyclopenta-pyridin-7-OL
CAS:
126053-15-4
MF:
C8H8ClNO
Structure:
Chemical Name:
PYRAZOLO[1,5-A]PYRIMIDINE-3-CARBALDEHYDE
CAS:
879072-59-0
MF:
C7H5N3O
Structure:
Chemical Name:
3-METHOXYCARBONYL-5-NITRO-2(1H)-PYRIDINONE
CAS:
856579-28-7
MF:
C7H6N2O5
Structure:
Chemical Name:
2-AMINO-6-FLUORO-4-HYDRAZINOPYRIMIDINE
CAS:
188987-85-1
MF:
C4H6FN5
Structure:
Chemical Name:
4-(METHYLAMINO)-3-NITROPYRIDINE
CAS:
1633-41-6
MF:
C6H7N3O2
Structure:
Chemical Name:
1-BROMO-2-METHOXY-3-NITRO-BENZENE
CAS:
31872-76-1
MF:
C6H5BrN2O3
Structure:
Chemical Name:
4-CHLOROFURO[3,2-D]PYRIMIDINE
CAS:
655255-09-7
MF:
C6H3ClN2O
Structure:
Chemical Name:
5-BROMO-2,4-DIMETHYLPYRIDINE
CAS:
27063-92-9
MF:
C7H8BrN
Structure:
Chemical Name:
4-AMINO-5-BROMO-6-CHLOROPYRIMIDINE
CAS:
663193-80-4
MF:
C4H3BrClN3
Structure:
Chemical Name:
3-CHLOROPYRIDAZINE-4-CARBONITRILE
CAS:
1445-56-3
MF:
C5H2ClN3
Structure:
Chemical Name:
4-Bromo-2-pyridinecarboxamide
CAS:
62150-46-3
MF:
C6H5BrN2O
Structure:
Chemical Name:
Pyridine, 2,4-dichloro-5-iodo-
CAS:
343781-49-7
MF:
C5H2Cl2IN
Structure:
Chemical Name:
4-CHLORO-6-METHYLNICOTINONITRILE
CAS:
38875-76-2
MF:
C7H5ClN2
Structure:
Chemical Name:
2-CHLORO-5-FLUORO-4-IODOPYRIDINE
MF:
C5H2ClFIN
Structure:
Chemical Name:
4-AMINO-2-BROMO-3-NITROPYRIDINE
CAS:
84487-14-9
MF:
C5H4BrN3O2
Structure:
Chemical Name:
2(3H)-PYRIDINONE, 3-CHLORO-5-(TRIFLUOROMETHYL)-
CAS:
79623-37-3
MF:
C6H3ClF3NO
Structure:
Chemical Name:
2-Bromo-6-methoxypyrimidine
CAS:
944709-74-4
MF:
C5H5BrN2O
Structure:
Chemical Name:
ethyl 4-amino-2-chloropyrimidine-5-carboxylate,4-amino-2-chloro-pyrimidine-5-carboxylic acid ethyl ester
CAS:
71406-78-5
MF:
C7H8ClN3O2
Structure:
Chemical Name:
4-Chloro-7H-pyrrolo[2,3-d]pyrimidine-5-carbaldehyde
CAS:
908287-21-8
MF:
C7H4ClN3O
Structure:
Chemical Name:
4-(Trifluoromethyl)pyrimidine-5-carboxylic acid
CAS:
220880-12-6
MF:
C6H3F3N2O2
Structure:
Chemical Name:
2-Chloro-4-ethoxy-6-methyl-pyrimidine
CAS:
37482-64-7
MF:
C7H9ClN2O
Structure:
Chemical Name:
5-pyrimidineethanol
CAS:
875251-47-1
MF:
C6H8N2O
Structure:
Chemical Name:
2-Amino-4-hydroxypyridine hydrochloride
CAS:
1187932-09-7
MF:
C5H6N2O.HCl
Structure:
Chemical Name:
6-Chlorooxazolo[4,5-b]pyridin-2(3H)-one
CAS:
35570-68-4
MF:
C6H3ClN2O2
Structure:
Chemical Name:
2-Amino-3-hydroxy-5-chloropyridine
CAS:
40966-87-8
MF:
C5H5ClN2O
Structure:
Chemical Name:
2-Amino-4,6-dichloro-nicotinicacidmethylester
CAS:
1044872-40-3
MF:
C7H6Cl2N2O2
Structure:
Chemical Name:
MK-1775
CAS:
955365-80-7
MF:
C27H32N8O2
Structure:
Chemical Name:
2,5-Dichloronicotinonitrile
CAS:
126954-66-3
MF:
C6H2Cl2N2
Structure:
Chemical Name:
N-(4-Methoxybenzyl)-4-nitropyridin-2-aMine
CAS:
942076-74-6
MF:
C13H13N3O3
Structure:
Chemical Name:
2-broMo-5-fluoropyridine-3,4-diaMine
CAS:
1227958-29-3
MF:
C5H5BrFN3
Structure:
Chemical Name:
1-METHYL-4-PHENYL-1,2,3,6-TETRAHYDROPYRIDINE
CAS:
28289-54-5
MF:
C12H15N
Structure:
Chemical Name:
N-Methyl-1-(pyridin-4-yl)methanamine
CAS:
6971-44-4
MF:
C7H10N2
Structure:
Chemical Name:
PIPERIDINE-4-CARBOXYLIC ACID (5-METHYL-PYRIDIN-2-YL)-AMIDE
CAS:
110105-97-0
MF:
C12H17N3O
Structure:
Chemical Name:
4-Phenylpyridine-N-oxide
CAS:
1131-61-9
MF:
C11H9NO
Structure:
Chemical Name:
2-N-OCTYLTHIOPHENE
CAS:
880-36-4
MF:
C12H20S
Structure:
Chemical Name:
4-AMINO-5-CHLOROPYRIDAZIN-6-ON
CAS:
6339-19-1
MF:
C4H4ClN3O
Structure:
Chemical Name:
4-(2-FURYL)-2-PYRIMIDINETHIOL
CAS:
190579-95-4
MF:
C8H6N2OS
Structure:
Chemical Name:
TRANS-DECAHYDROISOQUINOLINE
CAS:
2744-09-4
MF:
C9H17N
Structure:
Chemical Name:
1-PYRIDIN-4-YL-ETHANOL
CAS:
23389-75-5
MF:
C7H9NO
Structure:
Chemical Name:
2-CHLORO-5-N-DECYLPYRIMIDINE
CAS:
170434-06-7
MF:
C14H23ClN2
Structure:
Chemical Name:
8-METHYL-4-QUINAZOLONE
CAS:
19181-54-5
MF:
C9H8N2O
Structure:
Chemical Name:
4-(HYDROXYMETHYL)PICOLINITRILE
CAS:
71935-32-5
MF:
C7H6N2O
Structure:
Chemical Name:
4-HYDROXY-2-PHENYL-5-PYRIMIDINECARBOXYLIC ACID
CAS:
56406-26-9
MF:
C11H8N2O3
Structure:
Chemical Name:
Mivobulin
CAS:
122332-18-7
MF:
C17H19N5O2
Structure:
Chemical Name:
2-AMINO-4,6-DIHYDROXYPYRIDINE
MF:
C5H6N2O2
Structure:
Chemical Name:
4-METHYL-6-PHENYLPYRIMIDIN-2-AMINE
CAS:
15755-15-4
MF:
C11H11N3
Structure:
Chemical Name:
2-(4-Bromophenyl)imidazo[1,2-a]pyridine
CAS:
34658-66-7
MF:
C13H9BrN2