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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-DICHLORO-6-METHYL-3-NITROPYRIDINE 2,4-DICHLORO-6-METHYL-3-NITROPYRIDINE 63897-12-1 C6H4Cl2N2O2
2-Hydroxy-5-iodopyridine 2-Hydroxy-5-iodopyridine 13472-79-2 C5H4INO
5-Chloronicotinic acid 5-Chloronicotinic acid 22620-27-5 C6H4ClNO2
6-Methyluracil 6-Methyluracil 626-48-2 C5H6N2O2
5-Bromo-3-nitropyridine-2-carbonitrile 5-Bromo-3-nitropyridine-2-carbonitrile 573675-25-9 C6H2BrN3O2
2-Pyridylacetic acid hydrochloride 2-Pyridylacetic acid hydrochloride 16179-97-8 C7H8ClNO2
2,6-Difluoropyridine-3-boronic acid 2,6-Difluoropyridine-3-boronic acid 136466-94-9 C5H4BF2NO2
5-Nitropyridine-2-carboxylic acid 5-Nitropyridine-2-carboxylic acid 30651-24-2 C6H4N2O4
(6-BROMO-PYRIDIN-3-YL)-METHANOL (6-BROMO-PYRIDIN-3-YL)-METHANOL 122306-01-8 C6H6BrNO
4-Amino-3-bromopyridine 4-Amino-3-bromopyridine 13534-98-0 C5H5BrN2
2-(Chloromethyl)-3,5-dimethyl-4-methoxypyridine 2-(Chloromethyl)-3,5-dimethyl-4-methoxypyridine 84006-10-0 C9H12ClNO
2-Fluoropyridine-5-carboxaldehyde 2-Fluoropyridine-5-carboxaldehyde 677728-92-6 C6H4FNO
2,4-DICHLORO-5-NITROPYRIDINE 2,4-DICHLORO-5-NITROPYRIDINE 4487-56-3 C5H2Cl2N2O2
5-Amino-2,3-dichloropyridine 5-Amino-2,3-dichloropyridine 98121-41-6 C5H4Cl2N2
2,6-Diaminopyridine 2,6-Diaminopyridine 141-86-6 C5H7N3
3-BROMO-2-HYDROXY-5-METHYLPYRIDINE 3-BROMO-2-HYDROXY-5-METHYLPYRIDINE 17282-02-9 C6H6BrNO
5-Iodo-3-methyl-2-pyridinamine 5-Iodo-3-methyl-2-pyridinamine 166266-19-9 C6H7IN2
	Dibenzothiophene-2-boronic acid Dibenzothiophene-2-boronic acid 668983-97-9 C12H9BO2S
2-Hydroxy-5-methyl-3-nitropyridine 2-Hydroxy-5-methyl-3-nitropyridine 7464-14-4 C6H6N2O3
5-Bromo-2-iodopyridine 5-Bromo-2-iodopyridine 223463-13-6 C5H3BrIN
6-BROMO-3H-OXAZOLO[4,5-B]PYRIDIN-2-ONE
6-BROMO-3H-OXAZOLO[4,5-B]PYRIDIN-2-ONE 21594-52-5 C6H3BrN2O2
4-AMINOPYRAZOLO[3,4-D]PYRIMIDINE 4-AMINOPYRAZOLO[3,4-D]PYRIMIDINE 20289-44-5 C5H5N5
2,3-Dihydropyrido[2,3-d][1,3]oxazol-2-one 2,3-Dihydropyrido[2,3-d][1,3]oxazol-2-one 60832-72-6 C6H4N2O2
2-Fluoro-6-methylpyridine 2-Fluoro-6-methylpyridine 407-22-7 C6H6FN
Methyl 2,2-dithienylglycolate Methyl 2,2-dithienylglycolate 26447-85-8 C11H10O3S2
2-Cyano-3-nitropyridine 2-Cyano-3-nitropyridine 51315-07-2 C6H3N3O2
6-METHYL-2-PYRIDINEMETHANOL 6-METHYL-2-PYRIDINEMETHANOL 1122-71-0 C7H9NO
(3alpha)-3-chloro-Cholest-4-ene (3alpha)-3-chloro-Cholest-4-ene 13901-10-5 C27H45Cl
2-Hydroxy-4-methylpyridine 2-Hydroxy-4-methylpyridine 13466-41-6 C6H7NO
1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinecarboxamide 1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinecarboxamide 29097-12-9 C9H12N2O3
2-Amino-6-chloropyridine 2-Amino-6-chloropyridine 45644-21-1 C5H5ClN2
2-Amino-3-cyanopyridine 2-Amino-3-cyanopyridine 24517-64-4 C6H5N3
3,6-Dichloro-4-methylpyridazine 3,6-Dichloro-4-methylpyridazine 19064-64-3 C5H4Cl2N2
6-(Trifluoromethyl)nicotinonitrile 6-(Trifluoromethyl)nicotinonitrile 216431-85-5 C7H3F3N2
8-HYDROXYQUINOLINE-2-CARBOXYLIC ACID 8-HYDROXYQUINOLINE-2-CARBOXYLIC ACID 1571-30-8 C10H7NO3
6-HYDROXY-2,4,5-TRIAMINOPYRIMIDINE SULFATE 6-HYDROXY-2,4,5-TRIAMINOPYRIMIDINE SULFATE 39267-74-8 C4H9N5O5S
2,5-Dibromo-3-methylpyridine 2,5-Dibromo-3-methylpyridine 3430-18-0 C6H5Br2N
4-AMINO-7-(TRIFLUOROMETHYL)QUINOLINE 4-AMINO-7-(TRIFLUOROMETHYL)QUINOLINE 243666-11-7 C10H7F3N2
2,4-Diamino-6-hydroxypyrimidine 2,4-Diamino-6-hydroxypyrimidine 56-06-4 C4H6N4O
3-CHLORO-2,5-DIMETHYLPYRAZINE 3-CHLORO-2,5-DIMETHYLPYRAZINE 95-89-6 C6H7ClN2
4-HYDROXY-6-METHYL-3-NITRO-2-PYRIDONE 4-HYDROXY-6-METHYL-3-NITRO-2-PYRIDONE 4966-90-9 C6H6N2O4
2-Amino-3-chloropyridine 2-Amino-3-chloropyridine 39620-04-7 C5H5ClN2
2-ACETAMIDOPYRIDINE 2-ACETAMIDOPYRIDINE 5231-96-9 C7H8N2O
3-Bromo-2-methoxypyridine 3-Bromo-2-methoxypyridine 13472-59-8 C6H6BrNO
METHYL 3-AMINOTHIOPHENE-4-CARBOXYLATE HYDROCHLORIDE METHYL 3-AMINOTHIOPHENE-4-CARBOXYLATE HYDROCHLORIDE 39978-14-8 C6H8ClNO2S
2-Amino-4-methoxy-6-methylpyrimidine 2-Amino-4-methoxy-6-methylpyrimidine 7749-47-5 C6H9N3O
2-METHOXY-5-NITRO-4-PICOLINE 2-METHOXY-5-NITRO-4-PICOLINE 6635-90-1 C7H8N2O3
2-Amino-3-bromo-6-methylpyridine 2-Amino-3-bromo-6-methylpyridine 126325-46-0 C6H7BrN2
4-Amino-2-chloropyridine 4-Amino-2-chloropyridine 14432-12-3 C5H5ClN2
Kelex-100 Kelex-100 73545-11-6 C20H29NO
3-ETHYNYLPYRIDINE 3-ETHYNYLPYRIDINE 2510-23-8 C7H5N
2-Amino-6-chloro-3-nitropyridine 2-Amino-6-chloro-3-nitropyridine 27048-04-0 C5H4ClN3O2
2-[N,N-BIS(TRIFLUOROMETHANESULFONYL)AMINO]-5-CHLOROPYRIDINE 2-[N,N-BIS(TRIFLUOROMETHANESULFONYL)AMINO]-5-CHLOROPYRIDINE 145100-51-2 C7H3ClF6N2O4S2
2-Bromo-4-methylpyridine 2-Bromo-4-methylpyridine 4926-28-7 C6H6BrN
2-AMINO-5-BROMO-3-IODOPYRIDINE 2-AMINO-5-BROMO-3-IODOPYRIDINE 381233-96-1 C5H4BrIN2
2-Chloropyridine-4-boronic acid pinacol ester 2-Chloropyridine-4-boronic acid pinacol ester 458532-84-8 C11H15BClNO2
5-Bromo-4-chloro-7H-pyrrolo[2,3-d]pyrimidine 5-Bromo-4-chloro-7H-pyrrolo[2,3-d]pyrimidine 22276-95-5 C6H3BrClN3
6-Bromoimidazo[1,2-a]pyridine 6-Bromoimidazo[1,2-a]pyridine 6188-23-4 C7H5BrN2
2,6-Pyridinedicarboxylic acid monomethyl ester 2,6-Pyridinedicarboxylic acid monomethyl ester 7170-36-7 C8H7NO4
6-METHOXY-1,2,3,4-TETRAHYDRO-ISOQUINOLINE 6-METHOXY-1,2,3,4-TETRAHYDRO-ISOQUINOLINE 42923-77-3 C10H13NO
2-Hydroxy-6-methylpyridine-3-carboxylic acid 2-Hydroxy-6-methylpyridine-3-carboxylic acid 38116-61-9 C7H7NO3
5-AMINO-4-CHLOROPYRIMIDINE 5-AMINO-4-CHLOROPYRIMIDINE 54660-78-5 C4H4ClN3
1,6-NAPHTHYRIDINE 1,6-NAPHTHYRIDINE 253-72-5 C8H6N2
2-Methylisonicotinic acid 2-Methylisonicotinic acid 4021-11-8 C7H7NO2
2-Methylamino-3-nitro-6-chloropyridine 2-Methylamino-3-nitro-6-chloropyridine 33742-70-0 C6H6ClN3O2
3-CYANO-4,6-DIMETHYL-2-MERCAPTOPYRIDINE 3-CYANO-4,6-DIMETHYL-2-MERCAPTOPYRIDINE 54585-47-6 C8H8N2S
2-Amino-4-chloro-6-isopropylpyrimidine 2-Amino-4-chloro-6-isopropylpyrimidine 73576-33-7 C7H10ClN3
5-BROMO-2-(METHYLTHIO)PYRIMIDINE 5-BROMO-2-(METHYLTHIO)PYRIMIDINE 14001-67-3 C5H5BrN2S
5-(Trifluoromethyl)nicotinic acid 5-(Trifluoromethyl)nicotinic acid 131747-40-5 C7H4F3NO2
1-(2-CHLORO-PYRIDIN-4-YL)-ETHANONE 1-(2-CHLORO-PYRIDIN-4-YL)-ETHANONE 23794-15-2 C7H6ClNO
7-BROMO-ISOQUINOLIN-1-YLAMINE 7-BROMO-ISOQUINOLIN-1-YLAMINE 215453-53-5 C9H7BrN2
3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOCARBOXAMIDE 3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOCARBOXAMIDE 175277-46-0 C7H4ClF3N2S
1-Benzylpiperazine 1-Benzylpiperazine 110475-31-5 C11H17ClN2
3-HEXADECYLTHIOPHENE 3-HEXADECYLTHIOPHENE 119269-24-8 C20H36S
5-AMINO-2-PYRIDINOL HYDROCHLORIDE, 95 5-AMINO-2-PYRIDINOL HYDROCHLORIDE, 95 117865-72-2 C5H7ClN2O
5-BROMO-2,3-DIAMINOPYRIDINE, 97 5-BROMO-2,3-DIAMINOPYRIDINE, 97 4635-08-9 C5H6BrN3
4,6-Dihydroxy-2-methylpyrimidine 4,6-Dihydroxy-2-methylpyrimidine 1194-22-5 C5H6N2O2
5-METHOXY-2-SULFANYL-4-PYRIMIDINOL 5-METHOXY-2-SULFANYL-4-PYRIMIDINOL 6939-11-3 C5H6N2O2S
Ethyl N-piperazinecarboxylate Ethyl N-piperazinecarboxylate 120-43-4 C7H14N2O2
AMMONIUM ALGINATE AMMONIUM ALGINATE 9005-34-9 C13H16N3NaO4S
4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE 4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE 933-76-6 C5H4Cl2N2O
(2-METHYL-PYRIDIN-3-YL)-METHANOL (2-METHYL-PYRIDIN-3-YL)-METHANOL 56826-61-0 C7H9NO
ALPHA,ALPHA,ALPHA-TRIBROMOQUINALDINE ALPHA,ALPHA,ALPHA-TRIBROMOQUINALDINE 613-53-6 C10H6Br3N
5-METHOXY-PYRIDINE-3-CARBALDEHYDE 5-METHOXY-PYRIDINE-3-CARBALDEHYDE 113118-83-5 C7H7NO2
7-Quinolinecarboxylic acid 7-Quinolinecarboxylic acid 1078-30-4 C10H7NO2
2,4-Dichloro-5-methylpyridine 2,4-Dichloro-5-methylpyridine 56961-78-5 C6H5Cl2N
4-Vinylpyridine 4-Vinylpyridine 100-43-6 C7H7N
5-Amino-2-methyl-4(1H)-pyrimidinone 5-Amino-2-methyl-4(1H)-pyrimidinone 53135-22-1 C5H7N3O
5-bromoquinolin-8-ol 5-bromoquinolin-8-ol 1198-14-7 C9H6BrNO
Ethyl 5-bromothiophene-2-carboxylate Ethyl 5-bromothiophene-2-carboxylate 5751-83-7 C7H7BrO2S
5-Hydroxy-3-methylpyridine-2-carbonitrile 5-Hydroxy-3-methylpyridine-2-carbonitrile 228867-86-5 C7H6N2O
4-Amino-7H-pyrrolo[2,3-d]pyrimidine-2-thiol 4-Amino-7H-pyrrolo[2,3-d]pyrimidine-2-thiol 98198-24-4 C6H6N4S
8-Methoxyisoquinoline 8-Methoxyisoquinoline 1723-70-2 C10H9NO
2-Iodo-5-hydroxypyridine 2-Iodo-5-hydroxypyridine 129034-38-4 C5H4INO
4,6-Dimethyl-2-hydroxypyridine 4,6-Dimethyl-2-hydroxypyridine 16115-08-5 C7H9NO
3,4,6-Trichloropyridazine 3,4,6-Trichloropyridazine 6082-66-2 C4HCl3N2
3-BROMOIMIDAZO[1,2-A]PYRAZINE 3-BROMOIMIDAZO[1,2-A]PYRAZINE 57948-41-1 C6H4BrN3
4-Fluoro-2-methoxypyridine 4-Fluoro-2-methoxypyridine 96530-81-3 C6H6FNO
4,6-Dichloro-2,5-Dimethyl Pyrimidine 4,6-Dichloro-2,5-Dimethyl Pyrimidine 1780-33-2 C6H6Cl2N2
5-Fluoro-2-(trifluoromethyl)pyridine 5-Fluoro-2-(trifluoromethyl)pyridine 936841-73-5 C6H3F4N
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