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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
4-Bromo-2,6-diethyl-pyridine 4-Bromo-2,6-diethyl-pyridine 877133-54-5 C9H12BrN
QUINOLINE-2,4-DICARBOXYLIC ACID QUINOLINE-2,4-DICARBOXYLIC ACID 5323-57-9 C11H7NO4
3-CHLORO-2-FLUORO-5-(TRIFLUOROMETHYL)PYRIDINE 3-CHLORO-2-FLUORO-5-(TRIFLUOROMETHYL)PYRIDINE 72537-17-8 C6H2ClF4N
Pyrimidine, 2-bromo-5-chloro- Pyrimidine, 2-bromo-5-chloro- 124405-67-0 C4H2BrClN2
2,4-Dichloro-3-iodopyridine 2,4-Dichloro-3-iodopyridine 343781-36-2 C5H2Cl2IN
4-Chloro-2-(methylthio)-6-(propylamino)pyrimidine 4-Chloro-2-(methylthio)-6-(propylamino)pyrimidine 261765-64-4 C8H12ClN3S
5-bromo-4-(trifluoromethyl)pyrimidin-2-amine 5-bromo-4-(trifluoromethyl)pyrimidin-2-amine 935534-47-7 C5H3BrF3N3
2-Pyridyl tribromomethyl sulfone 2-Pyridyl tribromomethyl sulfone 59626-33-4 C6H4Br3NO2S
4-Amino-5-Hydroxymethyl-2-methylpyrimidine 4-Amino-5-Hydroxymethyl-2-methylpyrimidine 73-67-6 C6H9N3O
2,4-DIMETHYL-PYRIMIDINE-5-CARBOXYLIC ACID 2,4-DIMETHYL-PYRIMIDINE-5-CARBOXYLIC ACID 74356-36-8 C7H8N2O2
5-Aminoisoindolin-1-one 5-Aminoisoindolin-1-one 222036-66-0 C8H8N2O
N-BUTYL-3-METHYLPYRIDINIUM BROMIDE N-BUTYL-3-METHYLPYRIDINIUM BROMIDE 26576-85-2 C10H16BrN
2-AMINO-6-FLUORO-4-METHOXYPYRIMIDINE 2-AMINO-6-FLUORO-4-METHOXYPYRIMIDINE 130687-25-1 C5H6FN3O
3-Methoxypyridine-5-boronic acid pinacol ester 3-Methoxypyridine-5-boronic acid pinacol ester 445264-60-8 C12H18BNO3
2-Pyridinecarboxaldehyde,6-(fluoromethyl)-(9CI) 2-Pyridinecarboxaldehyde,6-(fluoromethyl)-(9CI) 208111-28-8 C7H6FNO
5H-Cyclopenta[b]pyridin-5-amine,6,7-dihydro-(9CI) 5H-Cyclopenta[b]pyridin-5-amine,6,7-dihydro-(9CI) 535935-84-3 C8H10N2
(2-Chloropyridin-3-yl)methanamine (2-Chloropyridin-3-yl)methanamine 205744-14-5 C6H7ClN2
5,6-DIHYDRO-6-METHYLURACIL 5,6-DIHYDRO-6-METHYLURACIL 2434-49-3 C5H8N2O2
benzyl 3,4-dihydro-2-methyl-4-oxopyridine-1(2H)-carboxylate benzyl 3,4-dihydro-2-methyl-4-oxopyridine-1(2H)-carboxylate 190906-91-3 C14H15NO3
Des-N-(methoxycarbonyl)-L-tert-leucine Bis-Boc Atazanavir Des-N-(methoxycarbonyl)-L-tert-leucine Bis-Boc Atazanavir 198904-86-8 C32H42N4O5
Methyl-5-bromo-2 pyrimidine carboxylate Methyl-5-bromo-2 pyrimidine carboxylate 89581-38-4 C6H5BrN2O2
2-METHOXYLYPYRIDINE-4-BORONIC ACID PINACOLATE 2-METHOXYLYPYRIDINE-4-BORONIC ACID PINACOLATE 408502-23-8 C12H18BNO3
2-Benzylpiperazine 2-Benzylpiperazine 84477-71-4 C11H16N2
7-(TRIFLUOROMETHYL)IMIDAZO[1,2-A]PYRIMIDINE 7-(TRIFLUOROMETHYL)IMIDAZO[1,2-A]PYRIMIDINE 375857-66-2 C7H4F3N3
6-METHYL-2,3-PYRIDINEDICARBOXYLIC ACID 6-METHYL-2,3-PYRIDINEDICARBOXYLIC ACID 53636-70-7 C8H7NO4
5-tert-butyl 2-ethyl 6,7-dihydrothiazolo[5,4-c]pyridine-2,5(4H)-dicarboxylate 5-tert-butyl 2-ethyl 6,7-dihydrothiazolo[5,4-c]pyridine-2,5(4H)-dicarboxylate 1053656-51-1 C14H20N2O4S
2-METHYLPYRIDINE-4-SULFONIC ACID 2-METHYLPYRIDINE-4-SULFONIC ACID 408533-46-0 C6H7NO3S
3-BROMOISONICOTINIC ACID METHYL ESTER 3-BROMOISONICOTINIC ACID METHYL ESTER 59786-31-1 C7H6BrNO2
4-(5-NITROPYRIDIN-2-YL)BENZOIC ACID 4-(5-NITROPYRIDIN-2-YL)BENZOIC ACID 223127-49-9 C12H8N2O4
2,6-DIMETHYLPYRIDINIUM P-TOLUENESULFONATE 2,6-DIMETHYLPYRIDINIUM P-TOLUENESULFONATE 93471-41-1 C14H17NO3S
2,6-Dimethoxypyridine-3-carboxylic acid 2,6-Dimethoxypyridine-3-carboxylic acid 16727-43-8 C8H9NO4
ETHYL PYRROLO[1,2-C]PYRIMIDINE-3-CARBOXYLATE ETHYL PYRROLO[1,2-C]PYRIMIDINE-3-CARBOXYLATE 107407-80-7 C10H10N2O2
3-amino-6-chloropyrazine-2-carboxylic acid 3-amino-6-chloropyrazine-2-carboxylic acid 2727-13-1 C5H4ClN3O2
(2-Methyl-6-trifluoromethylpyridin-3-yl)amine (2-Methyl-6-trifluoromethylpyridin-3-yl)amine 383907-17-3 C7H7F3N2
4-CYANO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 4-CYANO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 878194-91-3 C12H15BN2O2
5-HYDROXYMETHYLQUINOLINE 5-HYDROXYMETHYLQUINOLINE 16178-42-0 C10H9NO
4-Amino-2-(3-pyridyl)pyrimidine-5-carbonitrile 4-Amino-2-(3-pyridyl)pyrimidine-5-carbonitrile 175205-75-1 C10H7N5
2-FLUORO-3,4-DIIODOPYRIDINE 2-FLUORO-3,4-DIIODOPYRIDINE 153034-83-4 C5H2FI2N
2,8-DICHLORO-QUINOLINE-3-CARBALDEHYDE 2,8-DICHLORO-QUINOLINE-3-CARBALDEHYDE 144918-96-7 C10H5Cl2NO
7-BROMOTHIENO[3,2-D]PYRIMIDIN-4(1H)-ONE 7-BROMOTHIENO[3,2-D]PYRIMIDIN-4(1H)-ONE 31169-25-2 C6H3BrN2OS
N719 N719 207347-46-4 2C16H36N.2C12H7N2O4.C2N2RuS2
2-AMINO-3-CHLORO-5-BROMOPYRIDINE 2-AMINO-3-CHLORO-5-BROMOPYRIDINE 38185-55-6 C5H4BrClN2
4,6-DICHLORO-5-FLUORO-2-METHYLPYRIMIDINE 4,6-DICHLORO-5-FLUORO-2-METHYLPYRIMIDINE 105806-13-1 C5H3Cl2FN2
3-BROMO-5-CHLOROPYRAZOLO[1,5-A]PYRIMIDINE 3-BROMO-5-CHLOROPYRAZOLO[1,5-A]PYRIMIDINE 960613-96-1 C6H3BrClN3
2,4-DICHLORO-6,7-DIHYDRO-5H-CYCLOPENTAPYRIMIDINE 2,4-DICHLORO-6,7-DIHYDRO-5H-CYCLOPENTAPYRIMIDINE 5466-43-3 C7H6Cl2N2
Methyl-6-bromopyrazine-2-carboxylate Methyl-6-bromopyrazine-2-carboxylate 40155-34-8 C6H5BrN2O2
2,6-DIAMINO-3-NITROSOPYRIDINE 2,6-DIAMINO-3-NITROSOPYRIDINE 89323-10-4 C5H6N4O
3-AMINO-6-BROMOPYRAZINE-2-CARBONITRILE 3-AMINO-6-BROMOPYRAZINE-2-CARBONITRILE 17231-51-5 C5H3BrN4
Pyridine hydrofluoride Pyridine hydrofluoride 62778-11-4 C5H6FN
2,3-DIHYDRO-1H-PYRROLO[3,4-C]PYRIDINE 2,3-DIHYDRO-1H-PYRROLO[3,4-C]PYRIDINE 496-13-9 C7H8N2
5-AMINO-2-METHOXY-ISONICOTINIC ACID 5-AMINO-2-METHOXY-ISONICOTINIC ACID 183741-91-5 C7H8N2O3
Methyl 3-hydroxypyrazine-2-carboxylate Methyl 3-hydroxypyrazine-2-carboxylate 27825-20-3 C6H6N2O3
2-N-PROPYLTHIOPHENE 2-N-PROPYLTHIOPHENE 1551-27-5 C7H10S
5-NITRO-2-HYDROXY-4-METHOXYPYRIDINE 5-NITRO-2-HYDROXY-4-METHOXYPYRIDINE 607373-82-0 C6H6N2O4
1-(3-METHYLPYRIDIN-2-YL)PIPERAZINE 1-(3-METHYLPYRIDIN-2-YL)PIPERAZINE 111960-11-3 C10H15N3
2,6-DIMETHYL-NICOTINIC ACID 2,6-DIMETHYL-NICOTINIC ACID 5860-71-9 C8H9NO2
N-BOC-4-(4-CARBOXYPHENYL) PIPERIDINE N-BOC-4-(4-CARBOXYPHENYL) PIPERIDINE 149353-75-3 C17H23NO4
1-Cyclopentylpiperazine 1-Cyclopentylpiperazine 21043-40-3 C9H18N2
7-Hydroxy-6-methoxy-3,4-dihydroisoquinoline 7-Hydroxy-6-methoxy-3,4-dihydroisoquinoline 4602-73-7 C10H11NO2
2-(BROMOACETYL)PYRIDINE HYDROBROMIDE 2-(BROMOACETYL)PYRIDINE HYDROBROMIDE 17570-98-8 C7H7Br2NO
2-METHYL-5-NITROPYRIDIN-3-AMINE 2-METHYL-5-NITROPYRIDIN-3-AMINE 51984-61-3 C6H7N3O2
3-Methylpyridine-4-sulfonic acid 3-Methylpyridine-4-sulfonic acid 14045-23-9 C6H7NO3S
N-(3-IODO-PYRIDIN-4-YL)-2,2-DIMETHYL-PROPIONAMIDE N-(3-IODO-PYRIDIN-4-YL)-2,2-DIMETHYL-PROPIONAMIDE 113975-33-0 C10H13IN2O
2-CHLORO-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 2-CHLORO-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 99368-67-9 C6H2ClF3N2O2
2,8-DICHLOROQUINOLINE 2,8-DICHLOROQUINOLINE 4470-83-1 C9H5Cl2N
4-CHLORO-3-IODOPYRIDINE 4-CHLORO-3-IODOPYRIDINE 89167-34-0 C5H3ClIN
ISOQUINOLINE-3-CARBOXYLIC ACID HYDRATE ISOQUINOLINE-3-CARBOXYLIC ACID HYDRATE 207399-25-5 C10H9NO3
2,6-DIBROMO-3-HYDROXYPYRIDINE 2,6-DIBROMO-3-HYDROXYPYRIDINE 6602-33-1 C5H3Br2NO
5-IODO-4-METHYL-PYRIDIN-2-YLAMINE 5-IODO-4-METHYL-PYRIDIN-2-YLAMINE 356561-08-5 C6H7IN2
2-Ethoxy-3-pyridineboronic acid 2-Ethoxy-3-pyridineboronic acid 854373-97-0 C7H10BNO3
2,5-DIAMINO-3-PICOLINE, 2,5-DIAMINO-3-PICOLINE, 106070-58-0 C6H9N3
DIETHYL 3 4-PYRIDINEDICARBOXYLATE  97 DIETHYL 3 4-PYRIDINEDICARBOXYLATE 97 1678-52-0 C11H13NO4
1-(CYCLOPROPANECARBONYL)PIPERAZINE  97 1-(CYCLOPROPANECARBONYL)PIPERAZINE 97 59878-57-8 C8H14N2O
2-Mercapto-6-(trifluoromethyl)pyridine 2-Mercapto-6-(trifluoromethyl)pyridine 121307-80-0 C6H4F3NS
2-BROMOPYRIMIDIN-5-AMINE 2-BROMOPYRIMIDIN-5-AMINE 56621-91-1 C4H4BrN3
3-CHLORO-6-PYRROL-1-YL-PYRIDAZINE 3-CHLORO-6-PYRROL-1-YL-PYRIDAZINE 5096-76-4 C8H6ClN3
Methyl 2-amino-5-bromo-4-pyridinecarboxylate Methyl 2-amino-5-bromo-4-pyridinecarboxylate 882499-87-8 C7H7BrN2O2
2,4-DIAMINO-6-ETHOXYPYRIMIDINE 2,4-DIAMINO-6-ETHOXYPYRIMIDINE 116436-03-4 C6H10N4O
5-BROMO-4-METHOXYCARBONYL-2(1H)-PYRIDINONE 5-BROMO-4-METHOXYCARBONYL-2(1H)-PYRIDINONE 913836-17-6 C7H6BrNO3
N-octylpyridin-4-amine N-octylpyridin-4-amine 64690-19-3 C13H22N2
5-Chloro-N-tert-butyl-2-thiophenesulfonamide 5-Chloro-N-tert-butyl-2-thiophenesulfonamide 155731-14-9 C8H12ClNO2S2
5-Aminopyridine-2-carboxamide 5-Aminopyridine-2-carboxamide 145255-19-2 C6H7N3O
4-Amino-2-hydroxy-3-nitropyridine 4-Amino-2-hydroxy-3-nitropyridine 88511-57-3 C5H5N3O3
1,3-Dichloro-7-methylisoquinoline 1,3-Dichloro-7-methylisoquinoline 21902-37-4 C10H7Cl2N
5-Amino-1-chloroisoquinoline 5-Amino-1-chloroisoquinoline 374554-54-8 C9H7ClN2
1-(6-Pyridazinyl)piperazine 1-(6-Pyridazinyl)piperazine 51047-56-4 C8H12N4
4,6-Dihydroxynicotinic acid 4,6-Dihydroxynicotinic acid 5466-62-6 C6H5NO4
5-Chloropyridine-2-carboxylic acid methyl ester 5-Chloropyridine-2-carboxylic acid methyl ester 132308-19-1 C7H6ClNO2
2-Hydroxymethyl-3-methyl-4-(3-methoxy propanoxyl)pyridine 2-Hydroxymethyl-3-methyl-4-(3-methoxy propanoxyl)pyridine 118175-10-3 C11H17NO3
5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 30766-12-2 C7H7NO3
2-Chloro-4,6-dimethyl-3-pyridinecarboxylic acid 2-Chloro-4,6-dimethyl-3-pyridinecarboxylic acid 66662-48-4 C8H8ClNO2
6-Mercapto-4(1H)-pyrimidinone 6-Mercapto-4(1H)-pyrimidinone 6311-83-7 C4H4N2OS
5-AMINO-3-PYRIDINECARBOXAMIDE 5-AMINO-3-PYRIDINECARBOXAMIDE 60524-14-3 C6H7N3O
3,5-Dichloro-4-Picoline 3,5-Dichloro-4-Picoline 100868-46-0 C6H5Cl2N
2-Bromo-6-Fluoro-4-Picoline 2-Bromo-6-Fluoro-4-Picoline 180608-37-1 C6H5BrFN
2-Ethylpyrimidine-5-carbaldehyde 2-Ethylpyrimidine-5-carbaldehyde 205518-89-4 C7H8N2O
6-chloropyridine-3,4-diamine hydrochloride 6-chloropyridine-3,4-diamine hydrochloride 2604-40-2 C5H7Cl2N3
2,4-DIBROMO-3-NITROPYRIDINE 2,4-DIBROMO-3-NITROPYRIDINE 121263-10-3 C5H2Br2N2O2
2-HYDROXY-3-AMINO-5-CHLOROPYRIDINE 2-HYDROXY-3-AMINO-5-CHLOROPYRIDINE 98027-36-2 C5H5ClN2O
2-Pyrimidinamine, 4-bromo- (9CI) 2-Pyrimidinamine, 4-bromo- (9CI) 343926-69-2 C4H4BrN3
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