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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-PYRIDIN-3-YL-BENZOIC ACID 4-PYRIDIN-3-YL-BENZOIC ACID 4385-75-5 C12H9NO2
2-AMINO-5-BROMO-4 6-DIMETHYLPYRIDINE 2-AMINO-5-BROMO-4 6-DIMETHYLPYRIDINE 89856-44-0 C7H9BrN2
(DHQD)2PYR (DHQD)2PYR 149725-81-5 C56H60N6O4
6-CHLORO-2-METHYLPYRIDINE-3-BORONIC ACID 6-CHLORO-2-METHYLPYRIDINE-3-BORONIC ACID 913836-15-4 C6H7BClNO2
4-AMINO-5-BROMO-3-METHYLPYRIDINE 4-AMINO-5-BROMO-3-METHYLPYRIDINE 97944-43-9 C6H7BrN2
2-METHYL-4-PHENYL-5-PYRIMIDINECARBOXYLIC ACID 2-METHYL-4-PHENYL-5-PYRIMIDINECARBOXYLIC ACID 127958-10-5 C12H10N2O2
Poly(3-hexylthiophene-2,5-diyl) Poly(3-hexylthiophene-2,5-diyl) 104934-50-1 C10H14R2S
5-FLUORO-4-IODO-2-METHOXYPYRIDINE 5-FLUORO-4-IODO-2-METHOXYPYRIDINE 884495-13-0 C6H5FINO
2-ACETAMIDO-3-PICOLINE 2-ACETAMIDO-3-PICOLINE 7463-30-1 C8H10N2O
5-BROMO-2-CHLORO-4-(METHYLTHIO)PYRIMIDINE 5-BROMO-2-CHLORO-4-(METHYLTHIO)PYRIMIDINE 59549-51-8 C5H4BrClN2S
2-THIOPHENAMINE 2-THIOPHENAMINE 616-46-6 C4H5NS
2,3-DICYANOPYRAZINE 2,3-DICYANOPYRAZINE 13481-25-9 C6H2N4
6-BROMOFLAVONE 6-BROMOFLAVONE 1218-80-0 C15H9BrO2
Piroctone olamine Piroctone olamine 68890-66-4 C16H30N2O3
8-BROMO-4-HYDROXYQUINOLINE-3-CARBOXYLIC ACID 8-BROMO-4-HYDROXYQUINOLINE-3-CARBOXYLIC ACID 35973-17-2 C10H6BrNO3
2-(METHYLTHIO)-5-PYRIDINYL-BORONIC ACID 2-(METHYLTHIO)-5-PYRIDINYL-BORONIC ACID 321438-86-2 C6H8BNO2S
3-MERCAPTO-6-METHYLPYRIDAZINE 3-MERCAPTO-6-METHYLPYRIDAZINE 5788-47-6 C5H6N2S
2-(2-DIMETHYLAMINOETHYL)PYRIDINE 2-(2-DIMETHYLAMINOETHYL)PYRIDINE 6304-27-4 C9H14N2
ethyl 6-bromoH-pyrrolo[1,2-f]pyrimidine-3-carboxylate ethyl 6-bromoH-pyrrolo[1,2-f]pyrimidine-3-carboxylate 588720-12-1 C10H9BrN2O2
(Z,E)-N'-hydroxy-2-(2-oxopyridin-1(2H)-yl)Ethanimidamide (Z,E)-N'-hydroxy-2-(2-oxopyridin-1(2H)-yl)Ethanimidamide 871544-57-9 C7H9N3O2
5-methoxyisoquinoline 5-methoxyisoquinoline 90806-58-9 C10H9NO
1-(2-aminoethyl)pyridin-2(1H)-one 1-(2-aminoethyl)pyridin-2(1H)-one 35597-92-3 C7H10N2O
ETHYL-2,4-DIMETHYL-5-PYRIMIDINE CARBOXYLATE ETHYL-2,4-DIMETHYL-5-PYRIMIDINE CARBOXYLATE 2226-86-0 C9H12N2O2
4-METHOXY-5-AMINO-6-CHLOROPYRIMIDINE 4-METHOXY-5-AMINO-6-CHLOROPYRIMIDINE 15846-19-2 C5H6ClN3O
2-CHLORO-5-FLUORO-3-HYDROXYPYRIDINE 2-CHLORO-5-FLUORO-3-HYDROXYPYRIDINE 884494-35-3 C5H3ClFNO
2-METHOXYTETRAHYDROPYRAN 2-METHOXYTETRAHYDROPYRAN 6581-66-4 C6H12O2
5,7-DIMETHYLPYRIDO[2,3-D]PYRIMIDIN-4(3H)-ONE 5,7-DIMETHYLPYRIDO[2,3-D]PYRIMIDIN-4(3H)-ONE 1913-72-0 C9H9N3O
3-bromo-6-methylpyridazine 3-bromo-6-methylpyridazine 65202-58-6 C5H5BrN2
6-CHLORO-4-HYDROXYCOUMARIN 6-CHLORO-4-HYDROXYCOUMARIN 19484-57-2 C9H5ClO3
5-bromo-6-hydroxypyridine-3-carbonitrile 5-bromo-6-hydroxypyridine-3-carbonitrile 19840-44-9 C6H3BrN2O
4-(3-Bromophenyl)-2-chloropyrimidine 4-(3-Bromophenyl)-2-chloropyrimidine 499195-47-0 C10H6BrClN2
5-[2-Cyclopropyl-1-(2-fluorophenyl)-2-oxoethyl]-5,6,7,7a-tetrahydrothieno[3,2-c]pyridin-2(4H)-one 5-[2-Cyclopropyl-1-(2-fluorophenyl)-2-oxoethyl]-5,6,7,7a-tetrahydrothieno[3,2-c]pyridin-2(4H)-one 150322-38-6 C18H18FNO2S
2,6-bis(chloromethyl)pyridine 2,6-bis(chloromethyl)pyridine 55422-79-2 C7H8Cl3N
5-Amino-2-hydroxypyridine 5-Amino-2-hydroxypyridine 59315-46-7 C5H6N2O
5-Pyrimidinecarboxaldehyde, 2,4-dichloro- 5-Pyrimidinecarboxaldehyde, 2,4-dichloro- 871254-61-4 C5H2Cl2N2O
4-BROMO-2-CHLORO-5-FLUOROPYRIDINE 4-BROMO-2-CHLORO-5-FLUOROPYRIDINE 884495-10-7 C5H2BrClFN
4-Fluoropyridin-3-yl Boronic Acid 4-Fluoropyridin-3-yl Boronic Acid 860626-80-8 C5H5BFNO2
5-BROMO-4-CYANOPYRIMIDINE 5-BROMO-4-CYANOPYRIMIDINE 114969-66-3 C5H2BrN3
TERT-BUTYL 5-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-3,6-DIHYDROPYRIDINE-1(2H)-CARBOXYLATE TERT-BUTYL 5-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-3,6-DIHYDROPYRIDINE-1(2H)-CARBOXYLATE 885693-20-9 C16H28BNO4
6-CHLORO-2,2'-BIPYRIDINE 6-CHLORO-2,2'-BIPYRIDINE 13040-77-2 C10H7ClN2
2-Pyridinecarboxaldehyde, 3,6-dichloro- 2-Pyridinecarboxaldehyde, 3,6-dichloro- 343781-53-3 C6H3Cl2NO
6-CHLORO-5-METHYLPYRIDINE-3-CARBALDEHYDE 6-CHLORO-5-METHYLPYRIDINE-3-CARBALDEHYDE 176433-43-5 C7H6ClNO
2-CHLOROPYRIMIDINE-5-BORONIC ACID PINACOL ESTER 2-CHLOROPYRIMIDINE-5-BORONIC ACID PINACOL ESTER 1003845-08-6 C10H14BClN2O2
2-BROMO-5-FLUORO-3-PYRIDINECARBOXYLIC ACID 2-BROMO-5-FLUORO-3-PYRIDINECARBOXYLIC ACID 38186-89-9 C6H3BrFNO2
4-methoxy-3,5-dimethylpicolinaldehyde 4-methoxy-3,5-dimethylpicolinaldehyde 110464-72-7 C9H11NO2
7-Dimethylamino-4-methylcoumarin 7-Dimethylamino-4-methylcoumarin 87-01-4 C12H13NO2
2,4,5-Trichloro-7H-pyrrolo[2,3-d]pyrimidine 2,4,5-Trichloro-7H-pyrrolo[2,3-d]pyrimidine 1053228-28-6 C6H2Cl3N3
3,5-dichloropyridazin-4-amine 3,5-dichloropyridazin-4-amine 53180-76-0 C4H3Cl2N3
3-fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine 3-fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine 944401-75-6 C11H16BFN2O2
2-MERCAPTO-6-PROPYLPYRIMIDIN-4-OL 2-MERCAPTO-6-PROPYLPYRIMIDIN-4-OL 53939-84-7 C8H12N2OS
3-NITROISONICOTINALDEHYDE 3-NITROISONICOTINALDEHYDE 153813-70-8 C6H4N2O3
2-(6-CHLORO-3-PYRIDAZINYL)-2-PHENYLACETONITRILE 2-(6-CHLORO-3-PYRIDAZINYL)-2-PHENYLACETONITRILE 73535-73-6 C12H8ClN3
2-CHLORO-3-CYANOQUINOLINE 2-CHLORO-3-CYANOQUINOLINE 95104-21-5 C10H5ClN2
2-HYDROXYTETRAHYDROPYRAN 2-HYDROXYTETRAHYDROPYRAN 694-54-2 C5H10O2
3,4-DICHLOROPYRIDINE HCL 3,4-DICHLOROPYRIDINE HCL 159732-45-3 C5H4Cl3N
SALICYLIDENE 2-AMINOPYRIDINE SALICYLIDENE 2-AMINOPYRIDINE 1823-47-8 C12H10N2O
5-BROMO-2-(ISOPROPYLAMINO)PYRIMIDINE 5-BROMO-2-(ISOPROPYLAMINO)PYRIMIDINE 77476-95-0 C7H10BrN3
2-FLUORO-6-METHYLPYRIDINE-3-BORONIC ACID 2-FLUORO-6-METHYLPYRIDINE-3-BORONIC ACID C6H7BFNO2
6-AMINOQUINOLINE HYDROCHLORIDE 6-AMINOQUINOLINE HYDROCHLORIDE 53472-17-6 C9H9ClN2
6-Mercaptonicotinic acid 6-Mercaptonicotinic acid 92823-43-3 C6H5NO2S
2-PYRIDYLDITHIOCARBAMIC ACID ETHYL ESTER 2-PYRIDYLDITHIOCARBAMIC ACID ETHYL ESTER 13037-05-3 C8H10N2S2
BOC-D-ASP-OTBU BOC-D-ASP-OTBU 77004-75-2 C13H23NO6
2-BROMO-3-HYDROXYPYRIDINE-N-OXIDE 2-BROMO-3-HYDROXYPYRIDINE-N-OXIDE 6602-29-5 C5H4BrNO2
(6-bromo-3H-imidazo[4,5-b]pyridin-2-yl)methanol (6-bromo-3H-imidazo[4,5-b]pyridin-2-yl)methanol 172648-19-0 C7H6BrN3O
4(1H)-Pyrimidinone, 2-methoxy- (9CI) 4(1H)-Pyrimidinone, 2-methoxy- (9CI) 25902-86-7 C5H6N2O2
1-Pyrrolidineacetic acid, 3-hydroxy- (9CI) 1-Pyrrolidineacetic acid, 3-hydroxy- (9CI) 258530-57-3 C6H11NO3
4-chlorofuro[2,3-d]pyrimidine 4-chlorofuro[2,3-d]pyrimidine 918340-51-9 C6H3ClN2O
2-Benzyloxy-pyridine-5-boronic acid 2-Benzyloxy-pyridine-5-boronic acid 929250-35-1 C12H12BNO3
2-Bromo-3-fluoro-5-(trifluoromethyl)pyridine 2-Bromo-3-fluoro-5-(trifluoromethyl)pyridine 89402-29-9 C6H2BrF4N
(S,S)-6-BENZYL-OCTAHYDRO-PYRROLO[3,4-B]PYRIDINE DIHYDROCHLORIDE
(S,S)-6-BENZYL-OCTAHYDRO-PYRROLO[3,4-B]PYRIDINE DIHYDROCHLORIDE 151213-39-7 C14H20N2
2-Chloro-6-(trifluoromethyl)pyrimidin-4-amine 2-Chloro-6-(trifluoromethyl)pyrimidin-4-amine 85730-36-5 C5H3ClF3N3
6-Amino-1-benzyl-5-bromouracil 6-Amino-1-benzyl-5-bromouracil 72816-87-6 C11H10BrN3O2
METHYLPYRIDIN-2-YLMETHYLAMINE DIHYDROCHLORIDE METHYLPYRIDIN-2-YLMETHYLAMINE DIHYDROCHLORIDE 21035-59-6 C7H10N2
4-CHLORO-6-METHYLTHIOPYRIMIDINE 4-CHLORO-6-METHYLTHIOPYRIMIDINE 89283-48-7 C5H5ClN2S
5-BROMO-2-IODOPYRIDIN-3-OL 5-BROMO-2-IODOPYRIDIN-3-OL 188057-49-0 C5H3BrINO
4-aminopicolinonitrile 4-aminopicolinonitrile 98139-15-2 C6H5N3
5H-Cyclopenta[c]pyridin-5-one,6,7-dihydro-(9CI) 5H-Cyclopenta[c]pyridin-5-one,6,7-dihydro-(9CI) 350847-80-2 C8H7NO
SODIUM NICOTINATE SODIUM NICOTINATE 54-86-4 C6H6NNaO2
3-Pyridinecarbonitrile,5-methoxy-(9CI) 3-Pyridinecarbonitrile,5-methoxy-(9CI) 298204-74-7 C7H6N2O
3-Pyridazinecarboxylicacid,6-methyl-,methylester(9CI) 3-Pyridazinecarboxylicacid,6-methyl-,methylester(9CI) 106584-51-4 C7H8N2O2
4-Pyridinamine,2,5-dichloro-(9CI) 4-Pyridinamine,2,5-dichloro-(9CI) 405230-82-2 C5H4Cl2N2
2-CHLORO-4-HYDROXY-5-FLUOROPYRIMIDINE 2-CHLORO-4-HYDROXY-5-FLUOROPYRIMIDINE C4H2ClFN2O
(5-BROMO-PYRIMIDIN-2-YL)-PHENYL-AMINE (5-BROMO-PYRIMIDIN-2-YL)-PHENYL-AMINE 886365-88-4 C10H8BrN3
2-Amino-5-bromo-4-methylpyridine-3-carbonitrile 2-Amino-5-bromo-4-methylpyridine-3-carbonitrile 180994-87-0 C7H6BrN3
1,3-Dichloro-7-fluoroisoquinoline 1,3-Dichloro-7-fluoroisoquinoline 941294-25-3 C9H4Cl2FN
6-Chloro-N-(3-methoxypropyl)pyrimidin-4-amine 6-Chloro-N-(3-methoxypropyl)pyrimidin-4-amine 941294-46-8 C8H12ClN3O
4-Chloro-6-(pyrrolidin-1-yl)pyrimidine 4-Chloro-6-(pyrrolidin-1-yl)pyrimidine 939986-64-8 C8H10ClN3
5-Bromo-4-(2-methylphenyl)pyrimidine 5-Bromo-4-(2-methylphenyl)pyrimidine 941294-34-4 C11H9BrN2
Ethyl 8-bromo-6-chloroimidazo[1,2-a]pyridine-2-carboxylate Ethyl 8-bromo-6-chloroimidazo[1,2-a]pyridine-2-carboxylate 951884-22-3 C10H8BrClN2O2
6-BENZYLOXY-3-HYDROXYPYRIDINE 6-BENZYLOXY-3-HYDROXYPYRIDINE 725256-57-5 C12H11NO2
4-AMINO-5-BROMOPYRROLO[2,3-D]PYRIMIDINE 4-AMINO-5-BROMOPYRROLO[2,3-D]PYRIMIDINE 22276-99-9 C6H5BrN4
(4-Bromopyridin-3-yl)methanol (4-Bromopyridin-3-yl)methanol 197007-87-7 C6H6BrNO
6-CHLORO-IMIDAZO[1,2-B]PYRIDAZINE-3-CARBOXALDEHYDE 6-CHLORO-IMIDAZO[1,2-B]PYRIDAZINE-3-CARBOXALDEHYDE 154578-26-4 C7H4ClN3O
2,6-DICHLOROIMIDAZO[1,2-B]PYRIDAZINE 2,6-DICHLOROIMIDAZO[1,2-B]PYRIDAZINE 112581-77-8 C6H3Cl2N3
N-(3-Bromo-5-fluoropyridin-2-yl)acetamide N-(3-Bromo-5-fluoropyridin-2-yl)acetamide 1065074-95-4 C7H6BrFN2O
2-Bromo-6-chloropyrazine 2-Bromo-6-chloropyrazine 916791-07-6 C4H2BrClN2
2-Morpholinopyrimidin-4-ol 2-Morpholinopyrimidin-4-ol 19810-79-8 C8H11N3O2
4-Chloro-5,6-difluoropyridine-3-carboxylic acid 4-Chloro-5,6-difluoropyridine-3-carboxylic acid 851386-32-8 C6H2ClF2NO2
2,6-Dichloro-4-methyl-3-nitropyridine 2,6-Dichloro-4-methyl-3-nitropyridine 60010-03-9 C6H4Cl2N2O2
3-Bromo-2-fluoro--pyridine-5-carboxylic acid
3-Bromo-2-fluoro--pyridine-5-carboxylic acid 29241-63-2 C6H3BrFNO2
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