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:
4,4'-Dihydroxybiphenyl-3,3'-dicarboxylic acid
CAS:
13987-45-6
MF:
C14H10O6
Structure:
Chemical Name:
3-AMINO-2-CHLORO-5-FLUOROPYRIDINE
CAS:
884495-37-8
MF:
C5H4ClFN2
Structure:
Chemical Name:
O-Aminocyclo(Ser-O-amino-Ser-)
CAS:
17868-49-4
MF:
C6H12N4O4
Structure:
Chemical Name:
Diethyl 3-hydroxyglutarate
CAS:
32328-03-3
MF:
C9H16O5
Structure:
Chemical Name:
4,5-Dihydroisoxazole
CAS:
504-73-4
MF:
C3H5NO
Structure:
Chemical Name:
5-BROMO-1H-INDAZOL-3-AMINE
CAS:
61272-71-7
MF:
C7H6BrN3
Structure:
Chemical Name:
6-METHOXY-5-NITRO (1H)INDAZOLE
CAS:
152626-75-0
MF:
C8H7N3O3
Structure:
Chemical Name:
2-HYDROXY-4-METHYL-BENZOTHIOZOLE
CAS:
73443-84-2
MF:
C8H7NOS
Structure:
Chemical Name:
N-(2-HYDROXYPROPYL)MORPHOLINE
CAS:
2109-66-2
MF:
C7H15NO2
Structure:
Chemical Name:
1H-Benzotriazole-5-carboxylic acid
CAS:
60932-58-3
MF:
C7H5N3O2
Structure:
Chemical Name:
2-chloro-4,6-diphenyl-1,3,5-triazine
CAS:
3842-55-5
MF:
C15H10ClN3
Structure:
Chemical Name:
1-ethyl-1H-pyrazol-4-amine
CAS:
876343-24-7
MF:
C5H9N3
Structure:
Chemical Name:
2-Pyrimidinecarbothioamide (9CI)
CAS:
4537-73-9
MF:
C5H5N3S
Structure:
Chemical Name:
5-Nitro-2-pentanone
CAS:
22020-87-7
MF:
C5H9NO3
Structure:
Chemical Name:
6-Bromo-2-mercaptobenzothiazole
CAS:
51618-30-5
MF:
C7H4BrNS2
Structure:
Chemical Name:
ETHYL 2-(3-FORMYL-4-ISOBUTOXYPHENYL)-4-METHYLTHIAZOLE-5-CARBOXYLATE
CAS:
161798-03-4
MF:
C18H21NO4S
Structure:
Chemical Name:
8-Chloro-3-iodoimidazo[1,2-a]pyrazine
CAS:
1049677-32-8
MF:
C6H3ClIN3
Structure:
Chemical Name:
Glycine, L-α-glutamylglycyl-L-threonyl-L-phenylalanyl-L-threonyl-L-seryl-L-α-aspartyl-L-valyl-L-seryl-L-seryl-L-tyrosyl-L-leucyl-L-α-glutamylglycyl-L-glutaminyl-L-alanyl-L-alanyl-L-lysyl-L-α-glutamyl-L-phenylalanyl-L-isoleucyl-L-alanyl-L-tryptophyl-L-leucyl-L-valyl-L-arginylglycyl-L-arginyl-
CAS:
1169630-82-3
MF:
C142H216N38O45
Structure:
Chemical Name:
5-BROMO-2-CHLOROBENZOTHIAZOLE
CAS:
824403-26-1
MF:
C7H3BrClNS
Structure:
Chemical Name:
1-Chloro-1H-pyrrolo[1,2-a]pyrazine
CAS:
136927-64-5
MF:
C7H5ClN2
Structure:
Chemical Name:
5-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE
CAS:
131084-55-4
MF:
C7H5ClN2
Structure:
Chemical Name:
6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one
CAS:
1002726-62-6
MF:
C9H11N3O2
Structure:
Chemical Name:
(3-Hydroxy-1-pyrrolidinyl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone HCl
CAS:
1219976-33-6
MF:
C11H17ClN4O2
Structure:
Chemical Name:
(3-Bromophenyl)triphenylsilane
CAS:
185626-73-7
MF:
C24H19BrSi
Structure:
Chemical Name:
1-methyl-3-((methylamino)methyl)-1H-pyrazole-5-carbonitrilehydrochloride
CAS:
1643141-20-1
MF:
C7H11ClN4
Structure:
Chemical Name:
3-Bromo-4,5-dichlorotoluene
CAS:
960305-14-0
MF:
C7H5BrCl2
Structure:
Chemical Name:
1-Ethyl-1-cyclohexyl acrylate
CAS:
251909-25-8
MF:
C11H18O2
Structure:
Chemical Name:
1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one
CAS:
1373116-06-3
MF:
C15H16N6O2
Structure:
Chemical Name:
4-Bromo-3-fluorobenzenesulfonyl chloride
CAS:
351003-51-5
MF:
C6H3BrClFO2S
Structure:
Chemical Name:
6-METHYLINDOLE-3-CARBOXALDEHYDE
CAS:
4771-49-7
MF:
C10H9NO
Structure:
Chemical Name:
3-(3-Indolyl)-2-oxopropanoic acid
CAS:
392-12-1
MF:
C11H9NO3
Structure:
Chemical Name:
2-AMINO-8-CHLOROPYRIDO[3,4-D]PYRIMIDIN-4(3H)-ONE
CAS:
1413424-77-7
MF:
C7H5ClN4O
Structure:
Chemical Name:
D-Lysergic Acid Methyl Ester
CAS:
4579-64-0
MF:
C17H18N2O2
Structure:
Chemical Name:
2,3-DIHYDROXYPROPYL ACRYLATE
CAS:
10095-20-2
MF:
C6H10O4
Structure:
Chemical Name:
K-11777
CAS:
233277-99-1
MF:
C32H38N4O4S
Structure:
Chemical Name:
6-CHLORO-2-METHYLINDOLE
CAS:
6127-17-9
MF:
C9H8ClN
Structure:
Chemical Name:
2,5-Oxazolidinedione, 3,4-dimethyl-
CAS:
51784-00-0
MF:
C5H7NO3
Chemical Name:
NNMTi
CAS:
42464-96-0
Chemical Name:
(R)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride
Chemical Name:
(R)-2-(2,2-difluoroethyl)piperazine
Chemical Name:
(R)-2-(2,2-difluoroethyl)piperazine dihydrochloride
Structure:
Chemical Name:
N-BOC-1,2,3,6-TETRAHYDROPYRIDINE
CAS:
85838-94-4
MF:
C10H17NO2
Structure:
Chemical Name:
7-BROMO-1H-INDOLE-3-CARBOXYLIC ACID
CAS:
86153-25-5
MF:
C9H6BrNO2
Structure:
Chemical Name:
4-BROMO-8-METHOXYQUINOLINE
CAS:
103028-31-5
MF:
C10H8BrNO
Structure:
Chemical Name:
BOC-THIONOPHE-1-(6-NITRO)BENZOTRIAZOLIDE
CAS:
184951-87-9
MF:
C20H21N5O4S
Structure:
Chemical Name:
Ethyl 5-cyanoindole-2-carboxylate
CAS:
105191-13-7
MF:
C12H10N2O2
Structure:
Chemical Name:
6-Chloro-1-tetralone
CAS:
26673-31-4
MF:
C10H9ClO
Structure:
Chemical Name:
1-Ethylimidazole
CAS:
7098-07-9
MF:
C5H8N2
Structure:
Chemical Name:
2-Bromo-4-nitroimidazole
CAS:
65902-59-2
MF:
C3H2BrN3O2
Structure:
Chemical Name:
L-Valine, 3-methyl-N-(trifluoroacetyl)- (9CI)
CAS:
666832-71-9
MF:
C8H12F3NO3
Structure:
Chemical Name:
5-bromo-1,10-phenanthroline
CAS:
40000-20-2
MF:
C12H7BrN2
Structure:
Chemical Name:
ditetradecylamine
CAS:
17361-44-3
MF:
C28H59N
Structure:
Chemical Name:
2-Chloro-5-hydroxypyrimidine
CAS:
4983-28-2
MF:
C4H3ClN2O
Structure:
Chemical Name:
Piperazine, 1,2,2-trimethyl- (9CI)
CAS:
396133-32-7
MF:
C7H16N2
Structure:
Chemical Name:
2S-(2ALPHA,3ALPHA,BETA,7ALPHA,BETA-OCTAHYDRO-1H-INDOLE-2-CARBOXYLIC ACID PHENYL METHYL ESTER
CAS:
94062-52-9
MF:
C23H29NO5S
Structure:
Chemical Name:
5,6,7,8-TETRAHYDRO-6-(PHEHYLMETHYL)-1,6-NAPHTHYRIDIN-3-AMINE
CAS:
214699-26-0
MF:
C15H17N3
Structure:
Chemical Name:
5-Bromo-4,7-diazaindole
CAS:
875781-43-4
MF:
C6H4BrN3
Structure:
Chemical Name:
4-(5-Nitropyridin-2-yl)morpholine
CAS:
26820-62-2
MF:
C9H11N3O3
Structure:
Chemical Name:
Pyrimidine, 5-(chloromethyl)- (9CI)
CAS:
101346-02-5
MF:
C5H5ClN2
Structure:
Chemical Name:
3-AMINOMETHYL-6-(TRIFLUOROMETHYL)PYRIDINE
CAS:
387350-39-2
MF:
C7H7F3N2
Structure:
Chemical Name:
3-Bromo-4-trifluoromethylpyridine
CAS:
936841-70-2
MF:
C6H3BrF3N
Chemical Name:
Sulfa chloradazine sodium
Structure:
Chemical Name:
6-Chloro-1H-indazole
CAS:
698-25-9
MF:
C7H5ClN2
Structure:
Chemical Name:
2-(1H-indol-3-yl)acetaldehyde
CAS:
2591-98-2
MF:
C10H9NO
Structure:
Chemical Name:
1,3,4-oxadiazole
CAS:
288-99-3
MF:
C2H2N2O
Structure:
Chemical Name:
1-methylpseudouridine
CAS:
13860-38-3
MF:
C10H14N2O6
Structure:
Chemical Name:
2,3,4,5-Tetrahydro-7,8-dinitro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine
CAS:
230615-59-5
MF:
C13H10F3N3O5
Structure:
Chemical Name:
4-METHOXY (1H)INDAZOLE
CAS:
351210-06-5
MF:
C8H8N2O
Structure:
Chemical Name:
6-Trifluoromethyl-pyridine-2-carboxylic acid ethyl ester
CAS:
1010422-92-0
MF:
C9H8F3NO2
Structure:
Chemical Name:
2-Bromo-6-chloroquinoline
CAS:
891842-50-5
MF:
C9H5BrClN
Structure:
Chemical Name:
ethyl 4-bromo-1H-pyrrolo[2,3-b]pyridine-2-carboxylate
CAS:
942920-55-0
MF:
C10H9BrN2O2
Structure:
Chemical Name:
2,3,4,5-Tetrahydro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine-7,8-diamine
CAS:
230615-69-7
MF:
C13H14F3N3O
Structure:
Chemical Name:
6-chloro-4-methyl-2H-pyridazin-3-one
CAS:
1834-27-1
MF:
C5H5ClN2O
Structure:
Chemical Name:
1H-INDOLE-2-CARBOXYLIC ACID HYDRAZIDE
CAS:
5055-39-0
MF:
C9H9N3O
Structure:
Chemical Name:
(5-BROMOPYRAZIN-2-YL)CARBAMIC ACID TERT-BUTYL ESTER
CAS:
914349-79-4
MF:
C9H12BrN3O2
Structure:
Chemical Name:
3-bromo-1H-pyrazolo[4,3-c]pyridine
CAS:
633328-88-8
MF:
C6H4BrN3
Structure:
Chemical Name:
(5-Methyl-2-oxo-1,3-dioxol-4-yl)methyl 4-nitrophenyl carbonate
CAS:
173604-87-0
MF:
C12H9NO8
Structure:
Chemical Name:
4-IODO-3-METHYLANILINE
CAS:
4949-69-3
MF:
C7H8IN
Structure:
Chemical Name:
(R)-3-amino-1-butanol
CAS:
61477-40-5
MF:
C4H11NO
Structure:
Chemical Name:
5-Bromoindole-2-carboxylic acid methyl ester
CAS:
210345-56-5
MF:
C10H8BrNO2
Structure:
Chemical Name:
3'-Fluoro-5'-(trifluoromethyl)acetophenone
CAS:
202664-54-8
MF:
C9H6F4O
Structure:
Chemical Name:
4,4-DIFLUOROHEXAHYDRO-1H-AZEPINE HYDROCHLORIDE
CAS:
1094073-72-9
MF:
C6H12ClF2N
Structure:
Chemical Name:
3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine
CAS:
877173-84-7
MF:
C6H3BrClN3
Structure:
Chemical Name:
3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine
CAS:
877173-84-7
MF:
C6H3BrClN3
Structure:
Chemical Name:
3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine
CAS:
877173-84-7
MF:
C6H3BrClN3
Structure:
Chemical Name:
3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine
CAS:
877173-84-7
MF:
C6H3BrClN3
Structure:
Chemical Name:
(S)-(3-(3,4-dichlorophenyl)-3-(3-iodopropyl)piperidin-1-yl)(phenyl)methanone
CAS:
188916-67-8
MF:
C21H22Cl2INO
Structure:
Chemical Name:
3-(cyclopropylmethoxy)-4-(difluoromethoxy)benzoic Acid
CAS:
162401-62-9
MF:
C12H12F2O4
Structure:
Chemical Name:
4-AMino-5-Methylpyridin-2-ol
CAS:
95306-64-2
MF:
C6H8N2O
Structure:
Chemical Name:
4-HO-MiPT
CAS:
77872-43-6
MF:
C14H20N2O
Structure:
Chemical Name:
1-Cyclopropyl-6-fluoro-1,4-dihydro-8-hydroxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid
CAS:
721970-36-1
MF:
C20H22FN3O4
Structure:
Chemical Name:
1,4-Bis(benzhydryl)piperazine Dihydrochloride
CAS:
56265-29-3
MF:
C30H32Cl2N2
Structure:
Chemical Name:
6-BroMo-5-chloro-pyridine-2-carboxylic acid
CAS:
1214328-42-3
MF:
C6H3BrClNO2
Structure:
Chemical Name:
tert-butyl 4-(1H-benzo[d]iMidazol-2-yl)piperidine-1-carboxylate
CAS:
953071-73-3
MF:
C17H23N3O2
Structure:
Chemical Name:
3-Methylsulfonyl-azetidine hydrochloride
CAS:
1400764-60-4
MF:
C4H10ClNO2S
Structure:
Chemical Name:
Piperazine, 1-(cyclopropylcarbonyl)-, Monohydrochloride
CAS:
1021298-67-8
MF:
C8H15ClN2O
Structure:
Chemical Name:
tert-butyl (1R,2S,5S)-2-aMino-5-(diMethylcarbaMoyl)cyclohexylcarbaMate
CAS:
365998-36-3
MF:
C14H27N3O3
Structure:
Chemical Name:
2-(2-butyl-4-hydroxy-6-MethylpyriMidin-5-yl)-N,N-diMethylacetaMide
CAS:
1315478-13-7
MF:
C13H21N3O2
Structure:
Chemical Name:
1-[2-Chloro-1-hydroxy-3-(6-quinolinyl)propyl]-2,5-pyrrolidinedione
CAS:
1197377-31-3
MF:
C16H15ClN2O3
Structure:
Chemical Name:
2-Chloro-5-(trifluoromethyl)benzyl alcohol
CAS:
64372-62-9
MF:
C8H6ClF3O