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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
(S)-(-)-1-(4-PYRIDYL)ETHANOL (S)-(-)-1-(4-PYRIDYL)ETHANOL 54656-96-1 C7H9NO
3-(PYRIMIDIN-2-YL)BENZOIC ACID 3-(PYRIMIDIN-2-YL)BENZOIC ACID 579476-26-9 C11H8N2O2
5-VINYLURACIL 5-VINYLURACIL 37107-81-6 C6H6N2O2
2-Chloro-5-nitronicotinic acid 2-Chloro-5-nitronicotinic acid 42959-38-6 C6H3ClN2O4
2-(P-NITROBENZYL)PYRIDINE 2-(P-NITROBENZYL)PYRIDINE 620-87-1 C12H10N2O2
2-ACETAMIDO-4-METHYL-5-BROMOPYRIDINE 2-ACETAMIDO-4-METHYL-5-BROMOPYRIDINE 142404-82-8 C8H9BrN2O
2-AMINO-4-MORPHOLINO-6-METHYLPYRIMIDINE 2-AMINO-4-MORPHOLINO-6-METHYLPYRIMIDINE 7752-46-7 C9H14N4O
6-BENZYL-OCTAHYDRO-PYRROLO[3,4-B]PYRIDINE 6-BENZYL-OCTAHYDRO-PYRROLO[3,4-B]PYRIDINE 128740-14-7 C14H20N2
2-CHLORO-5-FLUORO-3-(HYDROXYMETHYL)PYRIDINE 2-CHLORO-5-FLUORO-3-(HYDROXYMETHYL)PYRIDINE 870063-52-8 C6H5ClFNO
METHYL 6-AMINO-5-BROMOPICOLINATE METHYL 6-AMINO-5-BROMOPICOLINATE 178876-82-9 C7H7BrN2O2
3-AMINO-7-AZAINDOLE 3-AMINO-7-AZAINDOLE 189882-31-3 C7H7N3
N-(CYANOMETHYL)PYRIDINIUM CHLORIDE N-(CYANOMETHYL)PYRIDINIUM CHLORIDE 17281-59-3 C7H7ClN2
3-AMINO-PYRIDINE-2-CARBALDEHYDE 3-AMINO-PYRIDINE-2-CARBALDEHYDE 55234-58-7 C6H6N2O
2-BROMO-6-METHYL-4-TRIFLUOROMETHYLPYRIDINE 2-BROMO-6-METHYL-4-TRIFLUOROMETHYLPYRIDINE 451459-17-9 C7H5BrF3N
2-HYDRAZINO-5-METHYLPYRIDINE 2-HYDRAZINO-5-METHYLPYRIDINE 4931-01-5 C6H9N3
5-ISOCYANATO-2-METHYL-PYRIDINE 5-ISOCYANATO-2-METHYL-PYRIDINE 732245-99-7 C7H6N2O
2,3,6-TRICHLOROPYRIDINE 2,3,6-TRICHLOROPYRIDINE 6515-09-9 C5H2Cl3N
2,5-DIMETHYLPYRAZOLO(1,5-A)PYRIMIDIN-7-ONE 2,5-DIMETHYLPYRAZOLO(1,5-A)PYRIMIDIN-7-ONE 98488-10-9 C8H9N3O
3-AMINOTHIOPHENE 3-AMINOTHIOPHENE 17721-06-1 C4H5NS
2-METHYL-6-(TRIFLUOROMETHYL)PYRIDINE-3-CARBONYL CHLORIDE 2-METHYL-6-(TRIFLUOROMETHYL)PYRIDINE-3-CARBONYL CHLORIDE 261635-98-7 C8H5ClF3NO
5-CHLOROPYRIDINE-2-BORONIC ACID PINACOL ESTER 5-CHLOROPYRIDINE-2-BORONIC ACID PINACOL ESTER 652148-93-1 C11H15BClNO2
5-BROMO-3-FLUORO-2-PYRIDINONE 5-BROMO-3-FLUORO-2-PYRIDINONE 156772-63-3 C5H3BrFNO
2,5-Dichlorothiophene-3-sulfonamide 2,5-Dichlorothiophene-3-sulfonamide 53595-68-9 C4H3Cl2NO2S2
2',3',5',6'-TETRAHYDRO-1'H-[3,4']BIPYRIDINYL-4'-OL 2',3',5',6'-TETRAHYDRO-1'H-[3,4']BIPYRIDINYL-4'-OL 50461-59-1 C10H14N2O
3-METHOXYPYRIDINE 3-METHOXYPYRIDINE 7295-76-3 C6H7NO
3-Pyridinepropionic acid 3-Pyridinepropionic acid 3724-19-4 C8H9NO2
4-CHLOROBENZYL 2-CHLORO-4-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLATE 4-CHLOROBENZYL 2-CHLORO-4-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLATE 175137-30-1 C13H7Cl2F3N2O2
5-(4-(2-(5-Ethylpyridin-2-yl)ethoxy)benzylidene)thiazolidine-2,4-dione 5-(4-(2-(5-Ethylpyridin-2-yl)ethoxy)benzylidene)thiazolidine-2,4-dione 627502-58-3 C19H18N2O3S
METHYL 6-OXO-1,6-DIHYDROPYRIDAZINE-3-CARBOXYLATE METHYL 6-OXO-1,6-DIHYDROPYRIDAZINE-3-CARBOXYLATE 63001-30-9 C6H6N2O3
2-CHLORO-3-FLUORO-4-NITROPYRIDINE N-OXIDE 2-CHLORO-3-FLUORO-4-NITROPYRIDINE N-OXIDE 101664-56-6 C5H2ClFN2O3
4-FLUORONICOTINIC ACID 4-FLUORONICOTINIC ACID 152126-33-5 C6H4FNO2
(S)-(-)-2-(ALPHA-METHYLBENZYLAMINO)-5-NITROPYRIDINE (S)-(-)-2-(ALPHA-METHYLBENZYLAMINO)-5-NITROPYRIDINE 84249-39-8 C13H13N3O2
2-ACETAMIDO-5-PICOLINE 2-ACETAMIDO-5-PICOLINE 4931-47-9 C8H10N2O
2-FLUORO-4-HYDROXYPYRIDINE 2-FLUORO-4-HYDROXYPYRIDINE 22282-69-5 C5H4FNO
4-DIMETHYLAMINOPYRIDINIUM BROMIDE PERBROMIDE 4-DIMETHYLAMINOPYRIDINIUM BROMIDE PERBROMIDE 92976-81-3 C7H11Br3N2
2,3,6-TRIFLUOROISONICOTINIC ACID 2,3,6-TRIFLUOROISONICOTINIC ACID 675602-92-3 C6H2F3NO2
2-METHYLTETRAHYDROTHIOPHENE 2-METHYLTETRAHYDROTHIOPHENE 1795-09-1 C5H10S
3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXYLIC ACID 3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXYLIC ACID 80194-68-9 C7H3ClF3NO2
(2-AMINO-5-IODO-PYRIDIN-3-YL)-METHANOL (2-AMINO-5-IODO-PYRIDIN-3-YL)-METHANOL 618107-90-7 C6H7IN2O
3,5-DICHLORO-2,6-DIFLUOROPYRIDINE 3,5-DICHLORO-2,6-DIFLUOROPYRIDINE 698-51-1 C5HCl2F2N
4-METHOXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 4-METHOXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 29681-43-4 C8H9NO3
ETHYL 4-HYDROXY-2-QUINOLINECARBOXYLATE ETHYL 4-HYDROXY-2-QUINOLINECARBOXYLATE 24782-43-2 C12H11NO3
6-(AMINOMETHYL)-2-PYRIDINE CARBOXYLIC ACID 6-(AMINOMETHYL)-2-PYRIDINE CARBOXYLIC ACID 160939-10-6 C8H10N2O2
1-ETHYL-3-METHYLPYRIDINIUM ETHYL SULFATE 1-ETHYL-3-METHYLPYRIDINIUM ETHYL SULFATE 872672-50-9 C10H17NO4S
3-AMINO-6-BROMO-2-CHLOROPYRIDINE 3-AMINO-6-BROMO-2-CHLOROPYRIDINE 169833-70-9 C5H4BrClN2
ETHYL 4-BROMO-3,5-DIMETHYL-1H-PYRROLE-2-CARBOXYLATE ETHYL 4-BROMO-3,5-DIMETHYL-1H-PYRROLE-2-CARBOXYLATE 368869-96-9 C11H9BrN2O
ISOQUINOLINE-8-CARBALDEHYDE ISOQUINOLINE-8-CARBALDEHYDE 787615-01-4 C10H7NO
4-ETHOXY-6-METHYLPYRIMIDINE 4-ETHOXY-6-METHYLPYRIMIDINE 4718-50-7 C7H10N2O
5-BROMO-4-METHYL-PYRIDINE-2-CARBONITRILE 5-BROMO-4-METHYL-PYRIDINE-2-CARBONITRILE 886364-86-9 C7H5BrN2
2-AMINO-3-CYANO-4-METHYLPYRIDINE 2-AMINO-3-CYANO-4-METHYLPYRIDINE 71493-76-0 C7H7N3
6-CHLORO-2-HYDROXYMETHYL PYRIDINE HYDROCHLORIDE 6-CHLORO-2-HYDROXYMETHYL PYRIDINE HYDROCHLORIDE 83782-89-2 C6H7Cl2NO
2-TRIFLUOROMETHYL-PYRIMIDINE-5-CARBALDEHYDE 2-TRIFLUOROMETHYL-PYRIMIDINE-5-CARBALDEHYDE 304693-66-1 C6H3F3N2O
TERT-BUTYL 4-BROMOPYRIDIN-2-YLCARBAMATE TERT-BUTYL 4-BROMOPYRIDIN-2-YLCARBAMATE 207799-10-8 C10H13BrN2O2
Uracil 5-carboxylic acid Uracil 5-carboxylic acid 59299-01-3 C5H4N2O4
2,4-DICHLORO-5-AMINO-6-METHYLPYRIMIDINE 2,4-DICHLORO-5-AMINO-6-METHYLPYRIMIDINE 13162-27-1 C5H5Cl2N3
1-PYRIMIDIN-2-YL-PIPERIDIN-4-ONE 1-PYRIMIDIN-2-YL-PIPERIDIN-4-ONE 116247-92-8 C9H11N3O
2-BENZYL-4,5-DICHLORO-2,3-DIHYDROPYRIDAZIN-3-ONE 2-BENZYL-4,5-DICHLORO-2,3-DIHYDROPYRIDAZIN-3-ONE 41933-33-9 C11H8Cl2N2O
4-PHENYLPYRIMIDIN-2-AMINE 4-PHENYLPYRIMIDIN-2-AMINE C10H9N3
2-(2'-AMINOETHYL)-6-METHYLPYRIDINE 2-(2'-AMINOETHYL)-6-METHYLPYRIDINE 19363-94-1 C8H12N2
3-CHLORO-5-METHYLPYRIDINE 3-CHLORO-5-METHYLPYRIDINE 19230-55-8 C6H6ClN
Ethyl thiophene-3-carboxylate Ethyl thiophene-3-carboxylate 5751-80-4 C7H8O2S
4-Amino-3-pyridinesulfonamide 4-Amino-3-pyridinesulfonamide 75903-62-7 C5H7N3O2S
4-TERT-BUTYLPYRIDINE 4-TERT-BUTYLPYRIDINE 3978-81-2 C9H13N
2-CHLORO-3-FLUOROPYRIDINE-5-BORONIC ACID 2-CHLORO-3-FLUOROPYRIDINE-5-BORONIC ACID 1072946-66-7 C5H4BClFNO2
(3,4-DIMETHOXY-BENZYL)-PYRIDIN-4-YLMETHYL-AMINE (3,4-DIMETHOXY-BENZYL)-PYRIDIN-4-YLMETHYL-AMINE 57342-20-8 C15H18N2O2
6-BROMO-2-METHOXY-3-NITRO-PYRIDINE 6-BROMO-2-METHOXY-3-NITRO-PYRIDINE 58819-77-5 C6H5BrN2O3
2,6-DIAMINO-4-METHYL PYRIDINE 2,6-DIAMINO-4-METHYL PYRIDINE 38439-33-7 C6H9N3
2,2,2-TRIFLUORO-1-PYRIDIN-2-YL-ETHYLAMINE 2,2,2-TRIFLUORO-1-PYRIDIN-2-YL-ETHYLAMINE 503173-14-6 C7H7F3N2
4,6-BIS(DIFLUOROMETHOXY)-2-(METHYLTHIO)PYRIMIDINE 4,6-BIS(DIFLUOROMETHOXY)-2-(METHYLTHIO)PYRIMIDINE 100478-25-9 C7H6F4N2O2S
tert-Butyl thiophen-2-ylcarbamate tert-Butyl thiophen-2-ylcarbamate 56267-50-6 C9H13NO2S
5-BROMO-2-FLUORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 5-BROMO-2-FLUORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073353-50-0 C11H14BBrFNO2
3-Ethyl-5-methyl-4-(2-chlorophenyl)-2-(2,2-diethoxy-ethoxymethyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate 3-Ethyl-5-methyl-4-(2-chlorophenyl)-2-(2,2-diethoxy-ethoxymethyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate 103094-30-0 C24H32ClNO7
2-amino-6-methylpyridin-3-ol 2-amino-6-methylpyridin-3-ol 20348-16-7 C6H8N2O
2-methoxy-4,6-dimethylpyrimidine 2-methoxy-4,6-dimethylpyrimidine 14001-61-7 C7H10N2O
Pyrimidine, 2-chloro-5-(trifluoromethyl)- (9CI) Pyrimidine, 2-chloro-5-(trifluoromethyl)- (9CI) 69034-12-4 C5H2ClF3N2
Pyrimidine, 5-methoxy- (6CI,7CI,8CI,9CI) Pyrimidine, 5-methoxy- (6CI,7CI,8CI,9CI) 31458-33-0 C5H6N2O
2-(3-METHOXY-PHENYL)-PIPERAZINE 2-(3-METHOXY-PHENYL)-PIPERAZINE 790164-75-9 C11H16N2O
6-oxo-1,6-dihydropyridazine-4-carboxylicacid 6-oxo-1,6-dihydropyridazine-4-carboxylicacid 867130-58-3 C5H4N2O3
4-Chloro-2,6-dimethyl-3-nitropyridine 4-Chloro-2,6-dimethyl-3-nitropyridine 15513-48-1 C7H7ClN2O2
4-(3-Pyridyl)-2-chloropyrimidine 4-(3-Pyridyl)-2-chloropyrimidine 483324-01-2 C9H6ClN3
2-Hydrazino-4,6-dimethylpyrimidine 2-Hydrazino-4,6-dimethylpyrimidine 23906-13-0 C6H10N4
5-Hydroxy-1,4-dihydropyrimidin-4-one 5-Hydroxy-1,4-dihydropyrimidin-4-one 15837-41-9 C4H4N2O2
4(1H)-Pyrimidinone, 6-ethyl- (9CI) 4(1H)-Pyrimidinone, 6-ethyl- (9CI) 124703-78-2 C6H8N2O
CHROMONE-3-CARBOXALDEHYDE CHROMONE-3-CARBOXALDEHYDE 17422-74-1 C10H6O3
7,8-DIHYDROXY-6-METHOXYCOUMARIN 7,8-DIHYDROXY-6-METHOXYCOUMARIN 574-84-5 C10H8O5
4-Chloro-7-methyl-7H-pyrrolo[2,3-d]pyrimidine 4-Chloro-7-methyl-7H-pyrrolo[2,3-d]pyrimidine 7781-10-4 C7H6ClN3
Ethyl 2-methylpyrimidine-5-carboxylate Ethyl 2-methylpyrimidine-5-carboxylate 2134-38-5 C8H10N2O2
5-BROMOPYRIDINE-3-CARBOHYDRAZIDE 5-BROMOPYRIDINE-3-CARBOHYDRAZIDE 112193-41-6 C6H6BrN3O
2-Cyanoamino-4,6-dihydroxypyrimidine 2-Cyanoamino-4,6-dihydroxypyrimidine 55067-10-2 C5H4N4O2
4-METHYL-7-AZAINDOLE 4-METHYL-7-AZAINDOLE 824-24-8 C8H8N2
5-Trifluoromethyl-pyridine-2-carboxylic acid methyl ester 5-Trifluoromethyl-pyridine-2-carboxylic acid methyl ester 124236-37-9 C8H6F3NO2
6-Bromopyridine-2-carboxamide 98% 6-Bromopyridine-2-carboxamide 98% 25194-52-9 C6H5BrN2O
1H-Imidazo[4,5-b]pyridine,5-bromo-(8CI) 1H-Imidazo[4,5-b]pyridine,5-bromo-(8CI) 28279-52-9 C6H4BrN3
2-(TERT-BUTOXYCARBONYLAMINO)PYRIDINE 2-(TERT-BUTOXYCARBONYLAMINO)PYRIDINE 38427-94-0 C10H14N2O2
4-HYDROXY-3-NITROPYRIDINE N-OXIDE 4-HYDROXY-3-NITROPYRIDINE N-OXIDE 31872-57-8 C5H4N2O4
2-Amino-5-bromoisonicotinic acid 2-Amino-5-bromoisonicotinic acid 1000339-23-0 C6H5BrN2O2
4-Chloro-5-nitro-2-hydroxypyridine 4-Chloro-5-nitro-2-hydroxypyridine 850663-54-6 C5H3ClN2O3
4-CHLORO-6-ETHYLTHIENO[2,3-D]PYRIMIDINE 4-CHLORO-6-ETHYLTHIENO[2,3-D]PYRIMIDINE 81136-42-7 C8H7ClN2S
4-Chloro-5-methyl-7H-pyrrolo[2,3-d]pyrimidine 4-Chloro-5-methyl-7H-pyrrolo[2,3-d]pyrimidine 1618-36-6 C7H6ClN3
6-HYDROXY-1,2,3,4-TETRAHYDRO-ISOQUINOLINE-3-CARBOXYLIC ACID 6-HYDROXY-1,2,3,4-TETRAHYDRO-ISOQUINOLINE-3-CARBOXYLIC ACID 76824-99-2 C10H11NO3
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