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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-PYRIDINE-2-CARBONITRILE 4-BROMO-PYRIDINE-2-CARBONITRILE 62150-45-2 C6H3BrN2
Picloram Picloram 1918-02-1 C6H3Cl3N2O2
2,4-DIAMINO-PYRIMIDINE-5-CARBALDEHYDE 2,4-DIAMINO-PYRIMIDINE-5-CARBALDEHYDE 20781-06-0 C5H6N4O
2,3,5-Trichloropyridine 2,3,5-Trichloropyridine 16063-70-0 C5H2Cl3N
3,5-Dibromo-2-chloropyridine 3,5-Dibromo-2-chloropyridine 40360-47-2 C5H2Br2ClN
5-Chloro-2-nitropyridine 5-Chloro-2-nitropyridine 52092-47-4 C5H3ClN2O2
1-BENZHYDRYLPIPERAZINE 1-BENZHYDRYLPIPERAZINE 841-77-0 C17H20N2
6-FORMYL-URACIL MONOHYDRATE 6-FORMYL-URACIL MONOHYDRATE 36327-91-0 C5H4N2O3
6-Hydroxypyrimidine-4-carboxylic acid 6-Hydroxypyrimidine-4-carboxylic acid 6299-87-2 C5H4N2O3
5-AMINO-2-CHLOROPYRIDINE-4-CARBOXYLIC ACID 5-AMINO-2-CHLOROPYRIDINE-4-CARBOXYLIC ACID 58483-95-7 C6H5ClN2O2
3-[(Methylamino)methyl]pyridine 3-[(Methylamino)methyl]pyridine 20173-04-0 C7H10N2
Methyl 2-chloro-4-(trifluoromethyl)pyrimidine-5-carboxylate Methyl 2-chloro-4-(trifluoromethyl)pyrimidine-5-carboxylate 175137-27-6 C7H4ClF3N2O2
Methyl2,4-Dichloropyrimidine-5-carboxylate Methyl2,4-Dichloropyrimidine-5-carboxylate 3177-20-6 C6H4Cl2N2O2
5-Amino-2-bromopyridine 5-Amino-2-bromopyridine 13534-97-9 C5H5BrN2
2-amino-5-bromopyridin-3-ol 2-amino-5-bromopyridin-3-ol 39903-01-0 C5H5BrN2O
3-Chloroisoquinoline 3-Chloroisoquinoline 19493-45-9 C9H6ClN
2-Chloro-5-methoxypyrimidine 2-Chloro-5-methoxypyrimidine 22536-65-8 C5H5ClN2O
2-Chloro-5-nitropyridin-4-amine 2-Chloro-5-nitropyridin-4-amine 2604-39-9 C5H4ClN3O2
3-Amino-2-bromo-5-fluoropyridine 3-Amino-2-bromo-5-fluoropyridine 884495-03-8 C5H4BrFN2
4-Nitro-2-picoline N-oxide 4-Nitro-2-picoline N-oxide 5470-66-6 C6H6N2O3
2-ACETYLAMINO-5-BROMOPYRIDINE 2-ACETYLAMINO-5-BROMOPYRIDINE 7169-97-3 C7H7BrN2O
2-Chloro-3-methyl-5-bromopyridine 2-Chloro-3-methyl-5-bromopyridine 29241-60-9 C6H5BrClN
4-Fluoropyridine hydrochloride 4-Fluoropyridine hydrochloride 39160-31-1 C5H5ClFN
4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile 4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile 21642-98-8 C7H6N2O2
3-BROMO-2-CHLORO-6-PICOLINE 3-BROMO-2-CHLORO-6-PICOLINE 185017-72-5 C6H5BrClN
6-Methoxynicotinic acid 6-Methoxynicotinic acid 66572-55-2 C7H7NO3
5-CHLORO-2-FLUORO-3-NITROPYRIDINE 5-CHLORO-2-FLUORO-3-NITROPYRIDINE 60186-16-5 C5H2ClFN2O2
2-Amino-3-bromo-5-chloropyridine 2-Amino-3-bromo-5-chloropyridine 26163-03-1 C5H4BrClN2
3-Ethynylthiophene 3-Ethynylthiophene 67237-53-0 C6H4S
4-Chloro-3-methylpyridine 4-Chloro-3-methylpyridine 1681-36-3 C6H6ClN
2,4,6-Trichloropyridine 2,4,6-Trichloropyridine 16063-69-7 C5H2Cl3N
3-AMINO-2-BROMO-5-CHLOROPYRIDINE 3-AMINO-2-BROMO-5-CHLOROPYRIDINE 90902-83-3 C5H4BrClN2
5-Bromo-2-methoxypyrimidine 5-Bromo-2-methoxypyrimidine 14001-66-2 C5H5BrN2O
3-BROMO-4-CHLORO-5-NITROPYRIDINE 3-BROMO-4-CHLORO-5-NITROPYRIDINE 31872-63-6 C5H2BrClN2O2
4-Aminomethylquinoline hydrochloride 4-Aminomethylquinoline hydrochloride 5632-13-3 C10H10N2
2-Amino-6-methyl-4-pyrimidinol 2-Amino-6-methyl-4-pyrimidinol 3977-29-5 C5H7N3O
3-Cyano-6-methyl-2(1H)-pyridinone 3-Cyano-6-methyl-2(1H)-pyridinone 4241-27-4 C7H6N2O
2-Chloro-4-cyanopyridine 2-Chloro-4-cyanopyridine 33252-30-1 C6H3ClN2
2-Acetyl-4-methylpyridine 2-Acetyl-4-methylpyridine 59576-26-0 C8H9NO
4-Hydroxypyridine-2-carboxylic acid 4-Hydroxypyridine-2-carboxylic acid 22468-26-4 C6H5NO3
Methyl 2-amino-5-bromonicotinate Methyl 2-amino-5-bromonicotinate 50735-34-7 C7H7BrN2O2
3-BROMO-2-CHLORO-4-PICOLINE 3-BROMO-2-CHLORO-4-PICOLINE 55404-31-4 C6H5BrClN
2-Chloro-3-cyano-4,6-dimethylpyridine 2-Chloro-3-cyano-4,6-dimethylpyridine 14237-71-9 C8H7ClN2
Methyl 2-oxo-1,2-dihydro-3-pyridinecarboxylate Methyl 2-oxo-1,2-dihydro-3-pyridinecarboxylate 10128-91-3 C7H7NO3
Methyl 2-chloro-6-methylpyridine-4-carboxylate Methyl 2-chloro-6-methylpyridine-4-carboxylate 3998-90-1 C8H8ClNO2
5-CYANO-2-FLUORO-3-PICOLINE 5-CYANO-2-FLUORO-3-PICOLINE 261625-67-6 C7H5FN2
4-Chloropyridine-2-carboxamide 4-Chloropyridine-2-carboxamide 99586-65-9 C6H5ClN2O
2-Fluoro-6-methyl-3-nitropyridine 2-Fluoro-6-methyl-3-nitropyridine 19346-45-3 C6H5FN2O2
2,6-Dihydroxypyridine 2,6-Dihydroxypyridine 626-06-2 C5H5NO2
2-Bromo-5-(trifluoromethyl)pyridine 2-Bromo-5-(trifluoromethyl)pyridine 50488-42-1 C6H3BrF3N
2-Picoline-N-oxide 2-Picoline-N-oxide 931-19-1 C6H7NO
2,5-Dichloropyrimidine 2,5-Dichloropyrimidine 22536-67-0 C4H2Cl2N2
Thiophene-3,4-dicarboxylic acid Thiophene-3,4-dicarboxylic acid 4282-29-5 C6H4O4S
3-Pyridyl bromide 3-Pyridyl bromide 626-55-1 C5H4BrN
4-AMINO-6-HYDROXY-2-METHYLPYRIMIDINE 4-AMINO-6-HYDROXY-2-METHYLPYRIMIDINE 767-16-8 C5H7N3O
N-Methylhomopiperazine N-Methylhomopiperazine 4318-37-0 C6H14N2
4-Amino-2-chloro-3-nitropyridine 4-Amino-2-chloro-3-nitropyridine 2789-25-5 C5H4ClN3O2
2-Chloro-5-nitropyrimidine 2-Chloro-5-nitropyrimidine 10320-42-0 C4H2ClN3O2
2-Chloro-4-hydroxypyridine 2-Chloro-4-hydroxypyridine 17368-12-6 C5H4ClNO
3,4,5-TRICHLOROPYRIDAZINE 3,4,5-TRICHLOROPYRIDAZINE 14161-11-6 C4HCl3N2
5,6,7,8-Tetrahydroquinolin-8-ol 5,6,7,8-Tetrahydroquinolin-8-ol 14631-46-0 C9H11NO
2-Amino-6-methoxypyridine 2-Amino-6-methoxypyridine 17920-35-3 C6H8N2O
2-Methoxypyridin-3-amine 2-Methoxypyridin-3-amine 20265-38-7 C6H8N2O
2-Chloro-3-methyl-5-nitropyridine 2-Chloro-3-methyl-5-nitropyridine 22280-56-4 C6H5ClN2O2
2,5-DIBROMO-3-BUTYLTHIOPHENE 2,5-DIBROMO-3-BUTYLTHIOPHENE 116971-10-9 C8H10Br2S
2-Amino-5-bromo-4,6-dimethylpyrimidine 2-Amino-5-bromo-4,6-dimethylpyrimidine 4214-57-7 C6H8BrN3
5-Bromo-2-methylpyridine 5-Bromo-2-methylpyridine 3430-13-5 C6H6BrN
2-CYANO-3-HYDROXYPYRIDINE 2-CYANO-3-HYDROXYPYRIDINE 932-35-4 C6H4N2O
2-Amino-5-chloro-3-nitropyridine 2-Amino-5-chloro-3-nitropyridine 5409-39-2 C5H4ClN3O2
2-CHLORO-3,5-DINITROPYRIDINE 2-CHLORO-3,5-DINITROPYRIDINE 2578-45-2 C5H2ClN3O4
1,2,3,4-Tetrahydro-8-hydroxyquinoline 1,2,3,4-Tetrahydro-8-hydroxyquinoline 6640-50-2 C9H11NO
2-(methylthio)pyrimidine-4,6-diol 2-(methylthio)pyrimidine-4,6-diol 1979-98-2 C5H6N2O2S
(2-AMINO-PYRIDIN-4-YL)-METHANOL (2-AMINO-PYRIDIN-4-YL)-METHANOL 105250-17-7 C6H8N2O
5-Methylpyridin-3-amine 5-Methylpyridin-3-amine 3430-19-1 C6H8N2
2-AMINO-4,6-DIHYDROXY-5-NITROPYRIMIDINE 2-AMINO-4,6-DIHYDROXY-5-NITROPYRIMIDINE 80466-56-4 C4H4N4O4
5-Bromo-3-pyridinecarboxaldehyde 5-Bromo-3-pyridinecarboxaldehyde 113118-81-3 C6H4BrNO
2-BROMO-4,6-DIMETHYLPYRIDINE 2-BROMO-4,6-DIMETHYLPYRIDINE 4926-26-5 C7H8BrN
2-BROMO-3-NITRO-4-PICOLINE 2-BROMO-3-NITRO-4-PICOLINE 23056-45-3 C6H5BrN2O2
3-FLUORO-2-HYDROXYPYRIDINE 3-FLUORO-2-HYDROXYPYRIDINE 1547-29-1 C5H4FNO
3-BROMOPYRIDIN-4-YLBORONIC ACID 3-BROMOPYRIDIN-4-YLBORONIC ACID 458532-99-5 C5H5BBrNO2
3-CHLOROPYRIDAZINE 3-CHLOROPYRIDAZINE 1120-95-2 C4H3ClN2
2-Bromopyrimidine 2-Bromopyrimidine 4595-60-2 C4H3BrN2
4-Amino-2,6-dimethoxypyrimidine 4-Amino-2,6-dimethoxypyrimidine 3289-50-7 C6H9N3O2
2-Amino-5-bromopyridine 2-Amino-5-bromopyridine 1072-97-5 C5H5BrN2
7-BROMO-4-CHLOROTHIENO[3,2-D]PYRIMIDINE 7-BROMO-4-CHLOROTHIENO[3,2-D]PYRIMIDINE 31169-27-4 C6H2BrClN2S
2,4-Dihydroxy-3-nitropyridine 2,4-Dihydroxy-3-nitropyridine 89282-12-2 C5H4N2O4
2,2'-DITHIOBIS(5-NITROPYRIDINE) 2,2'-DITHIOBIS(5-NITROPYRIDINE) 2127-10-8 C10H6N4O4S2
2-Phenylquinoline 2-Phenylquinoline 612-96-4 C15H11N
5-CARBETHOXY-2-THIOURACIL 5-CARBETHOXY-2-THIOURACIL 38026-46-9 C7H8N2O3S
4-Amino-2-ethoxypyridine 4-Amino-2-ethoxypyridine 89943-12-4 C7H10N2O
3-Methyl-2-pyridone 3-Methyl-2-pyridone 1003-56-1 C6H7NO
3-Bromo-5-methylpyridine 3-Bromo-5-methylpyridine 3430-16-8 C6H6BrN
IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID 133427-08-4 C8H6N2O2
2,4-DICHLORO-7H-PYRROLO2,3-DPYRIMIDINE 2,4-DICHLORO-7H-PYRROLO2,3-DPYRIMIDINE 90213-66-4 C6H3Cl2N3
3-Bromo-5-hydroxypyridine 3-Bromo-5-hydroxypyridine 74115-13-2 C5H4BrNO
4-Chloro-2-hydroxypyridine 4-Chloro-2-hydroxypyridine 40673-25-4 C5H4ClNO
2-BROMO-5-NITRO-6-PICOLINE 2-BROMO-5-NITRO-6-PICOLINE 22282-96-8 C6H5BrN2O2
2-Chloro-4-methyl-5-nitropyridine 2-Chloro-4-methyl-5-nitropyridine 23056-33-9 C6H5ClN2O2
5-Ethyl-2-methylpyridine 5-Ethyl-2-methylpyridine 104-90-5 C8H11N
2,4-Dichloro-5-aminopyrimidine 2,4-Dichloro-5-aminopyrimidine 5177-27-5 C4H3Cl2N3
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