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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
2,4-Diamino pyrimidine-3-oxide 2,4-Diamino pyrimidine-3-oxide 74638-76-9 C4H6N4O
2,4-DIMETHYLTHIOPHENE 2,4-DIMETHYLTHIOPHENE 638-00-6 C6H8S
5-BROMO-2-CHLORO-4-PYRIDINEBORONIC ACID 5-BROMO-2-CHLORO-4-PYRIDINEBORONIC ACID 871329-63-4 C5H4BBrClNO2
4-CHLORO-6-ETHYL-2-METHYLPYRIMIDINE 4-CHLORO-6-ETHYL-2-METHYLPYRIMIDINE 89966-72-3 C7H9ClN2
6-Bromo-5-methoxypicolinic acid 6-Bromo-5-methoxypicolinic acid 54232-43-8 C7H6BrNO3
8-CHLORO-2-HYDROXYQUINOLINE 8-CHLORO-2-HYDROXYQUINOLINE 23981-25-1 C9H6ClNO
Ethyl 6-chloroimidazo[1,2-a]pyridine-2-carboxylate Ethyl 6-chloroimidazo[1,2-a]pyridine-2-carboxylate 67625-38-1 C10H9ClN2O2
5-FORMYLPYRIDINE-3-BORONIC ACID PINACOL ESTER 5-FORMYLPYRIDINE-3-BORONIC ACID PINACOL ESTER 848093-29-8 C12H16BNO3
4,6-dichloronicotinaldehyde 4,6-dichloronicotinaldehyde 1060811-62-2 C6H3Cl2NO
3-Bromo-2,6-diaminopyridine ,95% 3-Bromo-2,6-diaminopyridine ,95% 54903-86-5 C5H6BrN3
2,6-BIS[1-(2-METHYLPHENYLIMINO)ETHYL]PYRIDINE 2,6-BIS[1-(2-METHYLPHENYLIMINO)ETHYL]PYRIDINE 210537-32-9 C23H23N3
3,4-Pyridinediamine,N3-(phenylmethyl)- 3,4-Pyridinediamine,N3-(phenylmethyl)- 75115-28-5 C12H13N3
4-AMINO-2-METHOXY-3-NITROPYRIDINE 4-AMINO-2-METHOXY-3-NITROPYRIDINE 33623-16-4 C6H7N3O3
6-BROMOCHROMONE 6-BROMOCHROMONE 51483-92-2 C9H5BrO2
3-Methoxyquinoline 3-Methoxyquinoline 6931-17-5 C10H9NO
1-(Phenylmethyl)piperazine 1-(Phenylmethyl)piperazine 860027-50-5 C11H16N2
2,6-Dibromo-4-nitropyridine N-oxide 2,6-Dibromo-4-nitropyridine N-oxide 98027-81-7 C5H2Br2N2O3
2-Hydroxynicotinonitrile 2-Hydroxynicotinonitrile 95907-03-2 C6H4N2O
Ethyl 1-benzyl-1,2,3,6-tetrahydropyridine-4-carboxylate Ethyl 1-benzyl-1,2,3,6-tetrahydropyridine-4-carboxylate 23019-62-7 C15H19NO2
5-iodopyrimidin-4-amine 5-iodopyrimidin-4-amine 91416-96-5 C4H4IN3
5-BROMOIMIDAZO[1,2-A]PYRAZINE 5-BROMOIMIDAZO[1,2-A]PYRAZINE 87597-26-0 C6H4BrN3
3,4-DIHYDRO-2,2-DIMETHYL-4-OXO-2H-PYRAN-6-CARBOXYLIC ACID 3,4-DIHYDRO-2,2-DIMETHYL-4-OXO-2H-PYRAN-6-CARBOXYLIC ACID 80866-93-9 C8H10O4
5-bromo-6-fluoropyridin-2-amine 5-bromo-6-fluoropyridin-2-amine 944401-65-4 C5H4BrFN2
4-Methyl-2-(trifluoromethanesulfonyl)Oxypyridine 4-Methyl-2-(trifluoromethanesulfonyl)Oxypyridine 179260-78-7 C7H6F3NO3S
1-(3-AMINO-PYRIDIN-4-YL)-ETHANONE 1-(3-AMINO-PYRIDIN-4-YL)-ETHANONE 13210-52-1 C7H8N2O
3-CYANOPYRIDINE-5-BORONIC ACID PINACOL ESTER 3-CYANOPYRIDINE-5-BORONIC ACID PINACOL ESTER 402718-29-0 C12H15BN2O2
3-(4,4-DIMETHYL-4,5-DIHYDRO-1,3-OXAZOL-2-YL)-4-METHYLPYRIDINE 3-(4,4-DIMETHYL-4,5-DIHYDRO-1,3-OXAZOL-2-YL)-4-METHYLPYRIDINE 68981-84-0 C11H14N2O
QUINIDINE HYDROCHLORIDE QUINIDINE HYDROCHLORIDE 6151-40-2 C20H27ClN2O3
3-OXO-3-PYRIDIN-4-YL-PROPIONITRILE 3-OXO-3-PYRIDIN-4-YL-PROPIONITRILE 23821-37-6 C8H6N2O
5-(AMINOMETHYL)-N,N-DIMETHYLPYRIDIN-2-AMINE 5-(AMINOMETHYL)-N,N-DIMETHYLPYRIDIN-2-AMINE 354824-17-2 C8H13N3
6-AMINO-5-NITROSO-3-METHYLURACIL 6-AMINO-5-NITROSO-3-METHYLURACIL 61033-04-3 C5H6N4O3
S-(Trifluoromethyl)dibenzothiophenium tetrafluoroborate S-(Trifluoromethyl)dibenzothiophenium tetrafluoroborate 131880-16-5 C13H8BF7S
3-Pyridinepropanol 3-Pyridinepropanol 2859-67-8 C8H11NO
3-HYDROXY-2-METHYLPYRIDINE-4-CARBOXALDEHYDE 3-HYDROXY-2-METHYLPYRIDINE-4-CARBOXALDEHYDE 518306-10-0 C7H7NO2
3-IODO-2-(TRIFLUOROMETHYL)PYRIDINE 3-IODO-2-(TRIFLUOROMETHYL)PYRIDINE 590371-71-4 C6H3F3IN
6-TERT-BUTOXYCARBONYLAMINO-PYRIDINE-2-CARBOXYLIC ACID 6-TERT-BUTOXYCARBONYLAMINO-PYRIDINE-2-CARBOXYLIC ACID 258497-21-1 C11H14N2O4
2-AMINO-4-BROMO-6-METHYLPYRIMIDINE 2-AMINO-4-BROMO-6-METHYLPYRIMIDINE 5734-71-4 C5H6BrN3
Pyridine, 2-iodo-4-methyl- Pyridine, 2-iodo-4-methyl- 22282-60-6 C6H6IN
Imidazo[1,2-a]pyrimidine-3-carboxylic acid Imidazo[1,2-a]pyrimidine-3-carboxylic acid 64951-11-7 C7H5N3O2
2-Bromo-3-[4-(2-(5-ethyl-2-pyridyl)ethoxy)phenyl]propionic acid methyl ester 2-Bromo-3-[4-(2-(5-ethyl-2-pyridyl)ethoxy)phenyl]propionic acid methyl ester 105355-25-7 C19H22BrNO3
2-BOC-AMINO PYRIDINE-5-BORONIC ACID 2-BOC-AMINO PYRIDINE-5-BORONIC ACID 883231-20-7 C10H15BN2O4
2-Bromo-6-(2-methyl-1,3-dioxolan-2-yl)pyridine 2-Bromo-6-(2-methyl-1,3-dioxolan-2-yl)pyridine 49669-14-9 C9H10BrNO2
2-Chloro-7-iodothieno[3,2-d]pyrimidine 2-Chloro-7-iodothieno[3,2-d]pyrimidine 1152475-40-5 C6H2ClIN2S
2-Chlorothieno[2,3-d]pyrimidine 2-Chlorothieno[2,3-d]pyrimidine 83259-30-7 C6H3ClN2S
methyl6-chloropyridazine-4-carboxylate methyl6-chloropyridazine-4-carboxylate 1093860-48-0 C6H5ClN2O2
N-[2-(1H-Indol-3-yl)ethyl]-N'-(4-pyridinyl)-1,4-benzenediamine N-[2-(1H-Indol-3-yl)ethyl]-N'-(4-pyridinyl)-1,4-benzenediamine 881202-45-5 C21H20N4
5-Amino-2-bromo-6-iodopyridine 5-Amino-2-bromo-6-iodopyridine 915006-52-9 C5H4BrIN2
5-BROMOPYRAZOLO[1,5-A]PYRIMIDINE 5-BROMOPYRAZOLO[1,5-A]PYRIMIDINE 1159981-95-9 C6H4BrN3
2-(trifluoromethyl)-6-iodopyridine 2-(trifluoromethyl)-6-iodopyridine 100366-74-3 C6H3F3IN
1-(TRIPHENYLMETHYL)PYRIDINIUM TETRAFLUOROBORATE 1-(TRIPHENYLMETHYL)PYRIDINIUM TETRAFLUOROBORATE 26156-84-3 C24H20BF4N
2-bromo-6-methylpyridin-4-amine 2-bromo-6-methylpyridin-4-amine 79055-59-7 C6H7BrN2
2-Chloro-4-methyl-5-pyridinecarbonitrile 2-Chloro-4-methyl-5-pyridinecarbonitrile 66909-35-1 C7H5ClN2
3,6-Dibromo-2,5-lutidine 3,6-Dibromo-2,5-lutidine 38749-93-8 C7H7Br2N
AS703026 AS703026 1236699-92-5 C15H15FIN3O3
2-BROMO-6-METHOXY-3-NITRO-PYRIDINE 2-BROMO-6-METHOXY-3-NITRO-PYRIDINE 344296-05-5 C6H5BrN2O3
6-METHYL-3,4-PYRIDINEDIAMINE 6-METHYL-3,4-PYRIDINEDIAMINE 861199-62-4 C6H9N3
2-HYDROXY-4-PHENYLPYRIDINE 2-HYDROXY-4-PHENYLPYRIDINE 19006-81-6 C11H9NO
4-(4-DIPENTADECYLAMINOSTYRYL)-N-METHYLPYRIDINIUM IODIDE 4-(4-DIPENTADECYLAMINOSTYRYL)-N-METHYLPYRIDINIUM IODIDE 135288-72-1 C44H75IN2
5-amino-3-bromo-2-fluoropyridine 5-amino-3-bromo-2-fluoropyridine 209328-99-4 C5H4BrFN2
Pyrimidine, 4-bromo-6-methyl- (9CI) Pyrimidine, 4-bromo-6-methyl- (9CI) 69543-98-2 C5H5BrN2
Pyridine, 2-fluoro-4-methoxy- (9CI) Pyridine, 2-fluoro-4-methoxy- (9CI) 175965-83-0 C6H6FNO
4,6-DIMETHOXYPYRIMIDINE-2-CARBOXYLICACID
4,6-DIMETHOXYPYRIMIDINE-2-CARBOXYLICACID 128276-50-6 C7H8N2O4
2-Fluoro-6-(difluoromethoxy)pyridine 2-Fluoro-6-(difluoromethoxy)pyridine 947534-62-5 C6H4F3NO
2-ETHOXY-3-ISOPROPYLPYRAZINE 2-ETHOXY-3-ISOPROPYLPYRAZINE 72797-16-1 C9H14N2O
2-Pyrrolidin-1-ylpyrimidine-5-carboxaldehyde 97% 2-Pyrrolidin-1-ylpyrimidine-5-carboxaldehyde 97% 937796-10-6 C9H11N3O
3-Bromo-5-nitrobenzonitrile 3-Bromo-5-nitrobenzonitrile 49674-15-9 C7H3BrN2O2
6-Chloro-N-(3-methoxypropyl)pyridazin-3-amine 6-Chloro-N-(3-methoxypropyl)pyridazin-3-amine 898656-60-5 C8H12ClN3O
N-(tert-Butyl)-6-chloropyrimidin-4-amine N-(tert-Butyl)-6-chloropyrimidin-4-amine 945896-38-8 C8H12ClN3
5-Bromo-2-hydrazino-3-nitropyridine 5-Bromo-2-hydrazino-3-nitropyridine 15862-42-7 C5H5BrN4O2
3(2H)-Pyridazinone,4-amino-(6CI,9CI) 3(2H)-Pyridazinone,4-amino-(6CI,9CI) 55271-46-0 C4H5N3O
3,6-Pyridazinediamine(9CI) 3,6-Pyridazinediamine(9CI) 61070-99-3 C4H6N4
2-Pyridinecarbonitrile,4-bromo-,1-oxide(9CI) 2-Pyridinecarbonitrile,4-bromo-,1-oxide(9CI) 62150-44-1 C6H3BrN2O
8-Quinolinamine,5,6,7,8-tetrahydro-,(8R)-(9CI) 8-Quinolinamine,5,6,7,8-tetrahydro-,(8R)-(9CI) 369655-84-5 C9H12N2
3-Pyridinecarboximidamide,6-methyl-(9CI) 3-Pyridinecarboximidamide,6-methyl-(9CI) 201937-20-4 C7H9N3
3-Pyridinemethanol,alpha,6-dimethyl-(6CI,9CI) 3-Pyridinemethanol,alpha,6-dimethyl-(6CI,9CI) 100189-16-0 C8H11NO
4-Pyridinol,5-amino-2-chloro-(9CI) 4-Pyridinol,5-amino-2-chloro-(9CI) 138084-66-9 C5H5ClN2O
2-(6-CHLORO-3-PYRIDAZINYL)-2-(2-PYRIDINYL)ACETONITRILE 2-(6-CHLORO-3-PYRIDAZINYL)-2-(2-PYRIDINYL)ACETONITRILE 338779-25-2 C11H7ClN4
TERT-BUTYL 4-AMINO-4-CYANOPIPERIDINE-1-CARBOXYLATE TERT-BUTYL 4-AMINO-4-CYANOPIPERIDINE-1-CARBOXYLATE 331281-25-5 C11H19N3O2
2-(TRIFLUOROMETHYL)THIOPHENE 2-(TRIFLUOROMETHYL)THIOPHENE 86093-76-7 C5H3F3S
5-Chloro-2-methoxy-3-nitropyridine 5-Chloro-2-methoxy-3-nitropyridine 22353-52-2 C6H5ClN2O3
2-Chloro-5-cyanopyridin-3-ylboronic acid 2-Chloro-5-cyanopyridin-3-ylboronic acid 957060-96-7 C6H4BClN2O2
6-Chloro-N-cyclopropylpyridazin-3-amine 6-Chloro-N-cyclopropylpyridazin-3-amine 941294-45-7 C7H8ClN3
4-Chloro-6-(cyclopropylamino)pyrimidine 4-Chloro-6-(cyclopropylamino)pyrimidine 941294-43-5 C7H8ClN3
5-Bromo-2-methoxypyridin-4-ylboronic acid 5-Bromo-2-methoxypyridin-4-ylboronic acid 957060-94-5 C6H7BBrNO3
7-Methoxyimidazo[1,2-a]pyridine-8-carbonitrile 7-Methoxyimidazo[1,2-a]pyridine-8-carbonitrile 834869-04-4 C9H7N3O
7-isoquinolinecarboxylic acid 7-isoquinolinecarboxylic acid 221050-96-0 C10H7NO2
2,4-dichloro-5-ethylpyrimidine 2,4-dichloro-5-ethylpyrimidine 34171-40-9 C6H6Cl2N2
5-bromo-4-chloropyrimidin-2-amine 5-bromo-4-chloropyrimidin-2-amine 1044767-99-8 C4H3BrClN3
Methyl 4-bromonicotinate Methyl 4-bromonicotinate 1043419-29-9 C7H6BrNO2
3-Bromo-2,6-dimethoxypyridine 3-Bromo-2,6-dimethoxypyridine 13445-16-4 C7H8BrNO2
3-METHYLPICOLINIC ACID HYDROCHLORIDE 3-METHYLPICOLINIC ACID HYDROCHLORIDE 123811-72-3 C7H8ClNO2
3-N-PROPYLTHIOPHENE 3-N-PROPYLTHIOPHENE 1518-75-8 C7H10S
1-(5-Nitro-2-pyridinyl)piperidine-3-methanol 1-(5-Nitro-2-pyridinyl)piperidine-3-methanol 419542-61-3 C11H15N3O3
1,3-DIMETHYLURACIL-5-CARBOXALDEHYDE 1,3-DIMETHYLURACIL-5-CARBOXALDEHYDE 4869-46-9 C7H8N2O3
3-HYDRAZINOPYRIDINE Dihydrochloride 3-HYDRAZINOPYRIDINE Dihydrochloride 42166-50-7 C5H7N3
2-[4-N-(HEXYLOXY)PHENYL]-5-N-OCTYLPYRIMIDINE 2-[4-N-(HEXYLOXY)PHENYL]-5-N-OCTYLPYRIMIDINE 57202-48-9 C24H36N2O
6-METHYLIMIDAZO[1,2-B]PYRIDAZINE 6-METHYLIMIDAZO[1,2-B]PYRIDAZINE 17412-38-3 C7H7N3
1-N-BOC-4-(3-AMINOMETHYLPYRIDYL)PIPERIDINE 1-N-BOC-4-(3-AMINOMETHYLPYRIDYL)PIPERIDINE 883516-43-6 C16H25N3O2
2-Phenyl-nicotinic acid ethyl ester 2-Phenyl-nicotinic acid ethyl ester 144501-28-0 C14H13NO2
5-Pyrimidinecarbonitrile,  2,4,6-triamino- 5-Pyrimidinecarbonitrile, 2,4,6-triamino- 465531-97-9 C5H6N6
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