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Heterocyclic compound

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 CAS MF
6,7-Dichloro-3-(trifluoromethyl)quinoxalin-2(1H)-one 6,7-Dichloro-3-(trifluoromethyl)quinoxalin-2(1H)-one 477857-25-3 C9H3Cl2F3N2O
1-(4-Fluorophenyl)-2-oxo-1,2-dihydropyridine-4-carbonitrile 1-(4-Fluorophenyl)-2-oxo-1,2-dihydropyridine-4-carbonitrile 929000-78-2 C12H7FN2O
4-HYDROXY-NICOTINIC ACID ETHYL ESTER 4-HYDROXY-NICOTINIC ACID ETHYL ESTER 57905-31-4 C8H9NO3
ethyl 2-(4,6-dichloropyrimidin-2-yl)acetate/63155-10-2 ethyl 2-(4,6-dichloropyrimidin-2-yl)acetate/63155-10-2 63155-10-2 C8H8Cl2N2O2
2-Ethoxy-4-chlor-pyrimidin 2-Ethoxy-4-chlor-pyrimidin 92520-02-0 C6H7ClN2O
(4-Chloro-pyrimidin-2-yl)-cyclopropyl-amine (4-Chloro-pyrimidin-2-yl)-cyclopropyl-amine 1044771-76-7 C7H8ClN3
3-bromo-4-methylpicolinonitrile 3-bromo-4-methylpicolinonitrile 717843-45-3 C7H5BrN2
4-chloro-2,5-diMethoxypyriMidine 4-chloro-2,5-diMethoxypyriMidine 370103-25-6 C6H7ClN2O2
2-(5-bromopyridin-2-yl)-2-methylpropanenitrile 2-(5-bromopyridin-2-yl)-2-methylpropanenitrile 871239-58-6 C9H9BrN2
1-Boc-6-benzyloctahydropyrrolo[3,4-b]pyridine 1-Boc-6-benzyloctahydropyrrolo[3,4-b]pyridine 159877-35-7 C19H28N2O2
2-Chloro-5-ethyl-pyridine 2-Chloro-5-ethyl-pyridine 90196-32-0 C7H8ClN
3,4-Diamino-6-bromopyridine 3,4-Diamino-6-bromopyridine 1033203-41-6 C5H6BrN3
6-Bromo-2-chloro-3-iodopyridine 6-Bromo-2-chloro-3-iodopyridine 1138444-17-3 C5H2BrClIN
5-Methyl-3-nitro-2-pyridinecarbonitrile 5-Methyl-3-nitro-2-pyridinecarbonitrile 1089330-68-6 C7H5N3O2
5-((4-Ethylpiperazin-1-yl)methyl)pyridin-2-amine 5-((4-Ethylpiperazin-1-yl)methyl)pyridin-2-amine 1180132-17-5 C12H20N4
1-[[[[2-[2-[2-[2-Methoxyethoxy]ethoxy]ethoxy]ethoxy]carbonyl]oxy]methyl]-4-[N'-cyano-N''-[6-[4-chlorophenoxy]hexyl]guanidino]pyridinium chloride 1-[[[[2-[2-[2-[2-Methoxyethoxy]ethoxy]ethoxy]ethoxy]carbonyl]oxy]methyl]-4-[N'-cyano-N''-[6-[4-chlorophenoxy]hexyl]guanidino]pyridinium chloride 432037-57-5 C30H43ClN5O8.Cl
2-(4-TRIFLUOROMETHYLPHENYL)PYRIMIDINE-5-CARBOXYLIC ACID METHYL ESTER 2-(4-TRIFLUOROMETHYLPHENYL)PYRIMIDINE-5-CARBOXYLIC ACID METHYL ESTER 871251-66-0 C13H9F3N2O2
4-Iodopyrimidin-2-amine 4-Iodopyrimidin-2-amine 815610-16-3 C4H4IN3
2-Chloro-3-pyridineacetic acid 2-Chloro-3-pyridineacetic acid 61494-55-1 C7H6ClNO2
4-(Dimethoxymethyl)-2-(methylthio)-pyrimidine 4-(Dimethoxymethyl)-2-(methylthio)-pyrimidine 180869-36-7 C8H12N2O2S
N-(5-Amino-3-bromopyridin-2-yl)acetamide N-(5-Amino-3-bromopyridin-2-yl)acetamide 896161-09-4 C7H8BrN3O
1-BENZYL-4-HYDROXY-5-AZAINDOLE 1-BENZYL-4-HYDROXY-5-AZAINDOLE 26956-47-8 C14H12N2O
2-CHLORO-5-METHYL-4-NITROPYRIDINE-N-OXIDE 2-CHLORO-5-METHYL-4-NITROPYRIDINE-N-OXIDE 60323-96-8 C6H5ClN2O3
4-Chloro-6-(methoxymethyl)-2-(pyridin-3-yl)pyrimidine 4-Chloro-6-(methoxymethyl)-2-(pyridin-3-yl)pyrimidine 339279-00-4 C11H10ClN3O
7-CHLORO-2,5-DIMETHYL-PYRAZOLO[1,5-A]PYRIMIDINE 7-CHLORO-2,5-DIMETHYL-PYRAZOLO[1,5-A]PYRIMIDINE 136549-13-8 C8H8ClN3
6-chloro-5-iodonicotinic acid 6-chloro-5-iodonicotinic acid 59782-87-5 C6H3ClINO2
2-methoxy-4,6-dimethylpyrimidine-5-carboxylic acid 2-methoxy-4,6-dimethylpyrimidine-5-carboxylic acid 4786-61-2 C8H10N2O3
(5-nitropyridin-2-yl)hydrazine (5-nitropyridin-2-yl)hydrazine 6343-98-2 C5H6N4O2
4-fluoro-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid 4-fluoro-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid 1016241-81-8 C7H4FN3O2
4-PHENYL-5-METHYL-6-HYDROXYPYRIMIDINE 4-PHENYL-5-METHYL-6-HYDROXYPYRIMIDINE 37898-32-1 C11H10N2O
5-Fluoro-2-methoxy-3-methylpyridine 5-Fluoro-2-methoxy-3-methylpyridine 884494-89-7 C7H8FNO
THIANAPHTHENE-2-CARBOXAMIDE THIANAPHTHENE-2-CARBOXAMIDE 6314-42-7 C9H7NOS
3-AMINO-6-(CHLOROMETHYL)-2-PYRAZINECARBONITRILE 4-OXIDE 3-AMINO-6-(CHLOROMETHYL)-2-PYRAZINECARBONITRILE 4-OXIDE 40127-89-7 C6H5ClN4O
5-fluoropyrimidin-4-amine 5-fluoropyrimidin-4-amine 811450-26-7 C4H4FN3
3-Cyano-4-trifluoromethyl-6-(4''-bromophenyl)pyridine-2-one 3-Cyano-4-trifluoromethyl-6-(4''-bromophenyl)pyridine-2-one 32801-22-2 C13H6BrF3N2O
1-(3-CHLOROPYRIDIN-2-YL)PIPERAZINE 1-(3-CHLOROPYRIDIN-2-YL)PIPERAZINE C9H12ClN3
6-BROMO-3-CYANOCHROMONE 6-BROMO-3-CYANOCHROMONE 52817-13-7 C10H4BrNO2
2-Chloro-3-nitropyridine-6-amine 2-Chloro-3-nitropyridine-6-amine 84487-03-6 C5H4ClN3O2
4-AMINO-5-IODOPYRIDINE-3-CARBOXALDEHYDE 4-AMINO-5-IODOPYRIDINE-3-CARBOXALDEHYDE 902837-57-4 C6H5IN2O
6-METHYL-2,2'-BIPYRIDINE 6-METHYL-2,2'-BIPYRIDINE 56100-22-2 C11H10N2
5-BROMO-2-PHENYLPYRIMIDINE 5-BROMO-2-PHENYLPYRIMIDINE 38696-20-7 C10H7BrN2
5-CHLORO-2-(CHLOROMETHYL)PYRIDINE 5-CHLORO-2-(CHLOROMETHYL)PYRIDINE 10177-24-9 C6H5Cl2N
(3-FLUOROPYRIDIN-4-YL)METHANAMINE (3-FLUOROPYRIDIN-4-YL)METHANAMINE 870063-62-0 C6H7FN2
3-(HYDRAZINO)PYRIDAZINE HYDROCHLORIDE 3-(HYDRAZINO)PYRIDAZINE HYDROCHLORIDE 117043-87-5 C4H7ClN4
5-Chloro-4-iodo-2(1H)-pyridinone 5-Chloro-4-iodo-2(1H)-pyridinone 1125410-07-2 C5H3ClINO
3-Bromo-6-quinolineacetic acid 3-Bromo-6-quinolineacetic acid 1022091-93-5 C11H8BrNO2
ethyl6-chloro-3-hydroxypyridazine-4-carboxylate ethyl6-chloro-3-hydroxypyridazine-4-carboxylate 61404-41-9 C7H7ClN2O3
4,4'-(6-chloropyriMidine-2,4-diyl)diMorpholine 4,4'-(6-chloropyriMidine-2,4-diyl)diMorpholine 10244-24-3 C12H17ClN4O2
N'-HYDROXY-2-THIOPHENECARBOXIMIDAMIDE N'-HYDROXY-2-THIOPHENECARBOXIMIDAMIDE 53370-51-7 C5H6N2OS
(5-METHOXYPYRIDIN-2-YL)METHANOL (5-METHOXYPYRIDIN-2-YL)METHANOL 127978-70-5 C7H9NO2
3-PHENOXYTHIOPHENE 3-PHENOXYTHIOPHENE 63285-84-7 C10H8OS
2,4,5-TRIAMINO-6-PYRIMIDINOL DIHYDROCHLORIDE 2,4,5-TRIAMINO-6-PYRIMIDINOL DIHYDROCHLORIDE 51324-37-9 C4H9Cl2N5O
2,4-BIS(DIETHYLAMINO)-6-FLUORO-PYRIMIDINE 2,4-BIS(DIETHYLAMINO)-6-FLUORO-PYRIMIDINE 1648-44-8 C12H21FN4
3-ACETYL-2-METHYL-5-PHENYLTHIOPHENE 3-ACETYL-2-METHYL-5-PHENYLTHIOPHENE 40932-63-6 C13H12OS
5-FLUORO-4-FORMYL-2-METHOXYPYRIDINE 5-FLUORO-4-FORMYL-2-METHOXYPYRIDINE 884495-12-9 C7H6FNO2
5-(4-[2-(5-ETHYL-2-PYRIDYL)ETHOXY]BENZYL)-2-IMINO-4-THIAZOLIDINONE 5-(4-[2-(5-ETHYL-2-PYRIDYL)ETHOXY]BENZYL)-2-IMINO-4-THIAZOLIDINONE C19H21N3O2S
THIOPHENE-3-CARBOXALDOXIME THIOPHENE-3-CARBOXALDOXIME 42466-50-2 C5H5NOS
(6-CHLORO-2-PHENYL-4-PYRIMIDINYL)METHYL METHYL ETHER (6-CHLORO-2-PHENYL-4-PYRIMIDINYL)METHYL METHYL ETHER C12H11ClN2O
3-FLUORO-2-(4-MORPHOLINO)PYRIDINE 3-FLUORO-2-(4-MORPHOLINO)PYRIDINE 693235-16-4 C9H11FN2O
2-AMINO-3,5-DIFLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 2-AMINO-3,5-DIFLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 883498-68-8 C6H3F5N2
4-(5-OCTYL-2-PYRIMIDINYL)PHENYL HEPTANOATE 4-(5-OCTYL-2-PYRIMIDINYL)PHENYL HEPTANOATE 58415-91-1 C25H36N2O2
TETRAFLUOROPYRIDAZINE TETRAFLUOROPYRIDAZINE 7627-80-7 C4F4N2
2,6-DICHLORO-5-FLUORONICOTINOYL CHLORIDE 2,6-DICHLORO-5-FLUORONICOTINOYL CHLORIDE 96568-02-4 C6HCl3FNO
5-FORMYL-2-ISOPROXYPYRIDINE 5-FORMYL-2-ISOPROXYPYRIDINE 884495-35-6 C9H11NO2
5-(tert-Butylcarbamoyl)pyridine-3-boronic acid 5-(tert-Butylcarbamoyl)pyridine-3-boronic acid 913835-99-1 C10H15BN2O3
5-BROMOPYRIDINE-3-SULPHONYL CHLORIDE HYDROCHLORIDE 95 5-BROMOPYRIDINE-3-SULPHONYL CHLORIDE HYDROCHLORIDE 95 913836-25-6 C5H4BrCl2NO2S
4,6-DIAMINOPYRIMIDINE HEMISULFATE, MONOHYDRATE, 98 4,6-DIAMINOPYRIMIDINE HEMISULFATE, MONOHYDRATE, 98 77709-02-5 C4H8N4O4S
ETRIMFOS ALCOHOL METABOLITE ETRIMFOS ALCOHOL METABOLITE 38249-44-4 C8H12N2O2
Levodropropizine Levodropropizine 99291-25-5 C13H20N2O2
2-HYDROXY-4-METHYLPYRIMIDINE-5-CARBOXYLIC ACID 2-HYDROXY-4-METHYLPYRIMIDINE-5-CARBOXYLIC ACID C6H6N2O3
3-NITROPYRIDINE-2-SULFONIC ACID 3-NITROPYRIDINE-2-SULFONIC ACID 54247-50-6 C5H4N2O5S
2,6-DIHYDROXY-3-NITROPYRIDINE 2,6-DIHYDROXY-3-NITROPYRIDINE 16013-84-6 C5H4N2O4
3,5-DIMETHOXYPYRIDINE-4-CARBOXALDEHYDE 3,5-DIMETHOXYPYRIDINE-4-CARBOXALDEHYDE 204862-70-4 C8H9NO3
2-PHENYLPYRIMIDIN-5-AMINE 2-PHENYLPYRIMIDIN-5-AMINE 59808-52-5 C10H9N3
4-IODO-2-METHOXYPYRIDINE 4-IODO-2-METHOXYPYRIDINE C6H6INO
2,3-DIPHENYLPYRAZINE 2,3-DIPHENYLPYRAZINE 1588-89-2 C16H12N2
3,5-DINITROISONICOTINIC ACID 3,5-DINITROISONICOTINIC ACID 191017-95-5 C6H3N3O6
6-METHYLBENZOTHIOPHENE 6-METHYLBENZOTHIOPHENE 16587-47-6 C9H8S
3-METHOXY-2-PYRIDINECARBOXYLIC ACID 3-METHOXY-2-PYRIDINECARBOXYLIC ACID 16478-52-7 C7H7NO3
4-ACETAMIDO-3-NITROPYRIDINE 4-ACETAMIDO-3-NITROPYRIDINE 79371-42-9 C7H7N3O3
3,4-DINITROPYRIDINE 3,4-DINITROPYRIDINE 14916-69-9 C5H3N3O4
ASISCHEM C63549 ASISCHEM C63549 335030-80-3 C7H7N3O2
4-CHLORO-5-METHOXY-2-(METHYLSULFANYL)PYRIMIDINE 4-CHLORO-5-METHOXY-2-(METHYLSULFANYL)PYRIMIDINE 87026-45-7 C6H7ClN2OS
2,5-DIBROMOPYRIDINE-3-BORONIC ACID PINACOL ESTER 2,5-DIBROMOPYRIDINE-3-BORONIC ACID PINACOL ESTER 852228-17-2 C11H14BBr2NO2
4-CYANO-2-IODOPYRIDINE 4-CYANO-2-IODOPYRIDINE 114821-24-8 C6H3IN2
6-FLUOROPYRIDO[3,4-D]PYRIMIDIN-4-OL 6-FLUOROPYRIDO[3,4-D]PYRIMIDIN-4-OL 171178-44-2 C7H4FN3O
3-BROMO-5-(METHYLTHIO)PYRIDINE 3-BROMO-5-(METHYLTHIO)PYRIDINE 142137-18-6 C6H6BrNS
7-CHLORO-BENZO[B]THIOPHENE 7-CHLORO-BENZO[B]THIOPHENE 90407-14-0 C8H5ClS
(4-METHYLPYRIDIN-3-YL)METHANOL (4-METHYLPYRIDIN-3-YL)METHANOL 4664-27-1 C7H9NO
2-Amino-3,5-dinitro-6-methylpyridine 2-Amino-3,5-dinitro-6-methylpyridine 25864-34-0 C6H6N4O4
2-(Dimethylamino)pyrimidine-4-carboxaldehyde 2-(Dimethylamino)pyrimidine-4-carboxaldehyde 872707-78-3 C7H9N3O
3-Amino-6-(propylthio)pyridazine 3-Amino-6-(propylthio)pyridazine 113121-36-1 C7H11N3S
2-Hydroxy-5-methylpyrimidine 2-Hydroxy-5-methylpyrimidine 41398-85-0 C5H6N2O
3-Chloro-2-mercapto-5-nitropyridine 3-Chloro-2-mercapto-5-nitropyridine 64007-60-9 C5H3ClN2O2S
3-Methyl-4-nitropyridine-2-carboxylic acid 3-Methyl-4-nitropyridine-2-carboxylic acid 30235-17-7 C7H6N2O4
5-Iodopyridine-2-carboxylic acid 5-Iodopyridine-2-carboxylic acid 32046-43-8 C6H4INO2
2-TRIFLUOROMETHYL-3-CYANOPYRIDINE 2-TRIFLUOROMETHYL-3-CYANOPYRIDINE 870066-15-2 C7H3F3N2
5-BROMO-2-CHLORO-4-(1-PYRROLIDINYL)PYRIMIDINE 5-BROMO-2-CHLORO-4-(1-PYRROLIDINYL)PYRIMIDINE 57054-90-7 C8H9BrClN3
2-amino-4,6-bis(difluoromethoxy)pyrimidine 2-amino-4,6-bis(difluoromethoxy)pyrimidine 86209-44-4 C6H5F4N3O2
4(1H)-Pyrimidinone, 2-ethoxy- (7CI,9CI) 4(1H)-Pyrimidinone, 2-ethoxy- (7CI,9CI) 25957-58-8 C6H8N2O2
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