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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
3-BROMO-5-(CHLOROMETHYL)PYRIDINE HYDROCHLORIDE 3-BROMO-5-(CHLOROMETHYL)PYRIDINE HYDROCHLORIDE C6H6BrCl2N
SULFADIMIDINE-D4 SULFADIMIDINE-D4 C12H10D4N4O2S
PYRADAPHENTHION SOLUTION 10 NG/MYL PYRADAPHENTHION SOLUTION 10 NG/MYL
2-METHYLDIBENZOTHIOPHENE 2-METHYLDIBENZOTHIOPHENE 20928-02-3 C13H10S
2-ETHOXYPYRIMIDIN-4-YLAMINE 2-ETHOXYPYRIMIDIN-4-YLAMINE C6H9N3O
5-ISOXAZOL-3-YLTHIOPHENE-2-SULFONYL CHLORIDE 5-ISOXAZOL-3-YLTHIOPHENE-2-SULFONYL CHLORIDE 160233-27-2 C7H4ClNO3S2
5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER C7H7NO3
5-BROMO-4,6-DIMETHOXYPYRIMIDINE 5-BROMO-4,6-DIMETHOXYPYRIMIDINE C6H7BrN2O2
(4-METHYLPYRIDIN-3-YL)METHYLAMINE (4-METHYLPYRIDIN-3-YL)METHYLAMINE 1443-42-1 C7H10N2
6-(1-FLUOROETHYL)-5-IODO-4(1H)-PYRIMIDINONE 6-(1-FLUOROETHYL)-5-IODO-4(1H)-PYRIMIDINONE 438449-92-4 C6H6FIN2O
6-BroMoisoquinoline hydrochloride 6-BroMoisoquinoline hydrochloride 1810070-25-7 C9H7BrClN
6-METHYLPYRIDINE-2-SULFONIC ACID 6-METHYLPYRIDINE-2-SULFONIC ACID 18615-99-1 C6H7NO3S
(1S,3S)-1-ETHYL-2,3,4,9-TETRAHYDRO-1H-PYRIDO[3,4-B]INDOLE-3-CARBOXYLIC ACID (1S,3S)-1-ETHYL-2,3,4,9-TETRAHYDRO-1H-PYRIDO[3,4-B]INDOLE-3-CARBOXYLIC ACID 134930-19-1 C14H16N2O2
2-Thienylglyoxal 2-Thienylglyoxal 51445-63-7 C6H4O2S
4-bromo-5-methoxypyrimidine 4-bromo-5-methoxypyrimidine 1211184-80-3 C5H5BrN2O
6-Bromo-5-ethoxypyridin-3-amine 6-Bromo-5-ethoxypyridin-3-amine 1020253-84-2 C7H9BrN2O
METHYL ISOQUINOLINE-7-CARBOXYLATE METHYL ISOQUINOLINE-7-CARBOXYLATE 178262-31-2 C11H9NO2
Ethyl 5-bromopyrimidine-2-carboxyate Ethyl 5-bromopyrimidine-2-carboxyate 1197193-30-8 C7H7BrN2O2
Cyclopropyl(3-pyridyl) ketone Cyclopropyl(3-pyridyl) ketone 24966-13-0 C9H9NO
(4,6-DIMETHOXY-PYRIMIDIN-2-YL)-HYDRAZINE (4,6-DIMETHOXY-PYRIMIDIN-2-YL)-HYDRAZINE 13223-30-8 C6H10N4O2
5-BROMO-4-METHOXYPYRIDIN-3-AMINE 5-BROMO-4-METHOXYPYRIDIN-3-AMINE 31872-78-3 C6H7BrN2O
1-(1-ADAMANTYL)PYRIDINIUM BROMIDE 1-(1-ADAMANTYL)PYRIDINIUM BROMIDE 19984-57-7 C15H20BrN
ETHYL 2-(METHYLTHIO)PYRIMIDINE-4-CARBOXYLATE ETHYL 2-(METHYLTHIO)PYRIMIDINE-4-CARBOXYLATE 250726-39-7 C8H10N2O2S
5,6-DIHYDROTHIENO[2,3-C]PYRIDIN-7(4H)-ONE 5,6-DIHYDROTHIENO[2,3-C]PYRIDIN-7(4H)-ONE 14470-51-0 C7H7NOS
2-Chloro-5-bromopyridine-4-carboxylic acid 2-Chloro-5-bromopyridine-4-carboxylic acid C6H3BrClNO2
Ethyl6-(trifluoromethyl)pyridazine-3-carboxylate Ethyl6-(trifluoromethyl)pyridazine-3-carboxylate 1192155-06-8 C8H7F3N2O2
Methyl5-fluoro-6-methylpicolinate Methyl5-fluoro-6-methylpicolinate 1245647-61-3 C8H8FNO2
6-Hydroxymethyl-2-methyl-pyridin-3-ol 6-Hydroxymethyl-2-methyl-pyridin-3-ol 4811-16-9 C7H9NO2
4-hydrazinylpyridazine hydrochloride 4-hydrazinylpyridazine hydrochloride 117044-03-8 C4H7ClN4
3-chloro-4-methylpicolinonitrile 3-chloro-4-methylpicolinonitrile 1261868-97-6 C7H5ClN2
73583-41-2 73583-41-2 73583-41-2 C5H3BrClN
Ethyl-(5-fluoro-pyrimidin-2-yl)-amine Ethyl-(5-fluoro-pyrimidin-2-yl)-amine 1289386-10-2 C6H8FN3
(2-Chloro-pyrimidin-4-ylmethyl)-cyclopropyl-amine (2-Chloro-pyrimidin-4-ylmethyl)-cyclopropyl-amine 1289386-31-7 C8H10ClN3
(4-Chloro-5-methyl-pyrimidin-2-yl)-ethyl-amine (4-Chloro-5-methyl-pyrimidin-2-yl)-ethyl-amine 1289387-57-0 C7H10ClN3
(6-Chloro-2-methanesulfinyl-pyrimidin-4-yl)-ethyl-amine (6-Chloro-2-methanesulfinyl-pyrimidin-4-yl)-ethyl-amine 1289385-39-2 C7H10ClN3OS
(S)-tert-butyl piperazine-3-carboxylate (S)-tert-butyl piperazine-3-carboxylate 104069-74-1 C9H18N2O2
2-(Boc-amino)-5-cyanopyridine 2-(Boc-amino)-5-cyanopyridine 814263-30-4 C11H13N3O2
2-(Methylsulfonyl)thieno[2,3-d]pyrimidine 2-(Methylsulfonyl)thieno[2,3-d]pyrimidine 598298-12-5 C7H6N2O2S2
(6-Chloro-3-nitro-pyridin-2-yl)-acetonitrile (6-Chloro-3-nitro-pyridin-2-yl)-acetonitrile 123846-69-5 C7H4ClN3O2
4-Pyridazineacetic acid lithium salt 4-Pyridazineacetic acid lithium salt 1217295-84-5 C6H7LiN2O2
2,3-dichloro-6-(trifluoroMethyl)-4-iodopyridine 2,3-dichloro-6-(trifluoroMethyl)-4-iodopyridine C6HCl2F3IN
Benzo[b]thiophene-3-ethylaMine Benzo[b]thiophene-3-ethylaMine 14585-66-1 C10H11NS
Ethyl 2,5-dibroMopyridine-3-carboxylate Ethyl 2,5-dibroMopyridine-3-carboxylate 1214375-74-2 C8H7Br2NO2
3-Oxo-2,3-dihydropyridazine-4-carboxaMide 3-Oxo-2,3-dihydropyridazine-4-carboxaMide 2125-92-0 C5H5N3O2
1-(6-Chloro-pyridazin-3-yl)-piperidin-3-ylaMine hydrochloride 1-(6-Chloro-pyridazin-3-yl)-piperidin-3-ylaMine hydrochloride 1185310-99-9 C9H14Cl2N4
3-(2-BroMo-pyridin-3-yloxy)-6-chloro-pyridazine 3-(2-BroMo-pyridin-3-yloxy)-6-chloro-pyridazine 1065484-70-9 C9H5BrClN3O
3-chloro-6-(3-chloropiperidin-1-yl)pyridazine 3-chloro-6-(3-chloropiperidin-1-yl)pyridazine 1185310-37-5 C9H11Cl2N3
2-(1-phenyl-1H-pyrazol-5-yl)pyriMidine 2-(1-phenyl-1H-pyrazol-5-yl)pyriMidine 1269291-79-3 C13H10N4
2,4'-bipyriMidin-2'-ol 2,4'-bipyriMidin-2'-ol
6-cyclobutylpyridazin-3(2H)-one 6-cyclobutylpyridazin-3(2H)-one 1161737-37-6 C8H10N2O
2-Bromo-1-(6-chloropyridin-3-yl)-ethanone 2-Bromo-1-(6-chloropyridin-3-yl)-ethanone 23794-13-0 C7H5BrClNO
2,4-dichloro-5-ethoxypyriMidine 2,4-dichloro-5-ethoxypyriMidine 280582-25-4 C6H6Cl2N2O
3,6-dichloro-4-ethylpyridazine 3,6-dichloro-4-ethylpyridazine 107228-54-6 C6H6Cl2N2
4-PyridazineMethanaMine hydrochloride 4-PyridazineMethanaMine hydrochloride 1028615-75-9 C5H8ClN3
Acetic acid, (2-pyridinylthio)-, ethyl ester (9CI) Acetic acid, (2-pyridinylthio)-, ethyl ester (9CI) 28856-92-0 C9H11NO2S
4-Chloro-2,5-dimethylpyrimidine 4-Chloro-2,5-dimethylpyrimidine 75712-74-2 C6H7ClN2
Imidazo[1,2-a]pyrimidine-2-carboxaldehyde (9CI) Imidazo[1,2-a]pyrimidine-2-carboxaldehyde (9CI) 143982-40-5 C7H5N3O
Pyrimidine, 5-fluoro-2-methyl- (9CI) Pyrimidine, 5-fluoro-2-methyl- (9CI) 54376-50-0 C5H5FN2
Pyridine, 3-bromo-5-(bromomethyl)- (9CI) Pyridine, 3-bromo-5-(bromomethyl)- (9CI) 145743-85-7 C6H5Br2N
Pyridine, 2-bromo-5-(chloromethyl)- (9CI) Pyridine, 2-bromo-5-(chloromethyl)- (9CI) 168173-56-6 C6H5BrClN
Furo[2,3-c]pyridin-7(6H)-one, 2,3-dihydro- (9CI) Furo[2,3-c]pyridin-7(6H)-one, 2,3-dihydro- (9CI) 588732-72-3 C7H7NO2
Pyrimido[5,4-d]pyrimidin-4-ol (8CI) Pyrimido[5,4-d]pyrimidin-4-ol (8CI) 28285-65-6 C6H4N4O
4-Amino-5-chloronicotinic acid 4-Amino-5-chloronicotinic acid 52834-09-0 C6H5ClN2O2
2-Propyn-1-ol, 3-(2-pyrimidinyl)- (9CI) 2-Propyn-1-ol, 3-(2-pyrimidinyl)- (9CI) 260441-08-5 C7H6N2O
4(1H)-Pyrimidinone, 6-amino-2-chloro- (9CI) 4(1H)-Pyrimidinone, 6-amino-2-chloro- (9CI) 52386-11-5 C4H4ClN3O
4-Pyrimidinamine, 2-ethoxy- (9CI) 4-Pyrimidinamine, 2-ethoxy- (9CI) 3289-48-3 C6H9N3O
5-Pyrimidinol, 4-amino-6-chloro- (9CI) 5-Pyrimidinol, 4-amino-6-chloro- (9CI) 38953-42-3 C4H4ClN3O
2-(2-tert-Butyl-6-methylpyran-4-ylidene)malononitrile 2-(2-tert-Butyl-6-methylpyran-4-ylidene)malononitrile 225378-53-0 C13H14N2O
2-chloro-N,N-dimethyl-5-phenylpyrimidin-4-amine 2-chloro-N,N-dimethyl-5-phenylpyrimidin-4-amine 771555-68-1 C12H12ClN3
4-oxo-1-phenyl-1,4-dihydro-3-pyridazinecarboxylic acid 4-oxo-1-phenyl-1,4-dihydro-3-pyridazinecarboxylic acid 147920-37-4 C11H8N2O3
4,6-dimethoxy-2-((ph 4,6-dimethoxy-2-((ph
5-ethyl-2,3-pyridine dicarboxylic acid 5-ethyl-2,3-pyridine dicarboxylic acid C9H9NO4
2-Bromo-3-iodo-4-picoline 2-Bromo-3-iodo-4-picoline C6H5BrIN
4-Bromo-5-fluoro-2-hydroxy-3-nitropyridine 4-Bromo-5-fluoro-2-hydroxy-3-nitropyridine C5H2BrFN2O3
3-methylbenzothiophene 3-methylbenzothiophene C9H8S
4-bromo-2-Amino Pyridine 4-bromo-2-Amino Pyridine C5H5BrN2
2-Cyanopyridine-3-boronic acid neopentyl glycol ester 2-Cyanopyridine-3-boronic acid neopentyl glycol ester 868944-75-6 C11H13BN2O2
2-Pyridinecarboxylicacid,4-cyano-(9CI) 2-Pyridinecarboxylicacid,4-cyano-(9CI) 640296-19-1 C7H4N2O2
4-Pyridinecarbonitrile,2-formyl-(9CI) 4-Pyridinecarbonitrile,2-formyl-(9CI) 116308-38-4 C7H4N2O
Furo[3,2-b]pyridin-3(2H)-one,2-methyl-(9CI) Furo[3,2-b]pyridin-3(2H)-one,2-methyl-(9CI) 107096-03-7 C8H7NO2
7(6H)-Isoquinolinone,5,8-dihydro-(9CI) 7(6H)-Isoquinolinone,5,8-dihydro-(9CI) 228271-52-1 C9H9NO
7(6H)-Isoquinolinone,5,8-dihydro-(9CI) 7(6H)-Isoquinolinone,5,8-dihydro-(9CI) 228271-52-1 C9H9NO
2(1H)-Pyridinone,5-fluoro-,hydrazone(9CI) 2(1H)-Pyridinone,5-fluoro-,hydrazone(9CI) 145934-90-3 C5H6FN3
6-Isoquinolinamine,5-bromo-(9CI) 6-Isoquinolinamine,5-bromo-(9CI) 566943-98-4 C9H7BrN2
3-Pyridineethanimidamide(9CI) 3-Pyridineethanimidamide(9CI) 474310-74-2 C7H9N3
2-Pyridinamine,6-(1,1-dimethylethyl)-(9CI) 2-Pyridinamine,6-(1,1-dimethylethyl)-(9CI) 97634-83-8 C9H14N2
2-AMINO-5-CHLORO-3-METHYLPYRIDINE HEMIHYDRATE 2-AMINO-5-CHLORO-3-METHYLPYRIDINE HEMIHYDRATE 1173019-45-8 C12H16Cl2N4O
2-Thiopheneacetaldehyde 2-Thiopheneacetaldehyde 15022-15-8 C6H6OS
4-Hydroxyisoquinoline 4-Hydroxyisoquinoline 33364-92-0
4-CHLORO-2,5-DIPHENYLTHIENO[2,3-D]PYRIMIDINE 4-CHLORO-2,5-DIPHENYLTHIENO[2,3-D]PYRIMIDINE 83548-63-4 C18H11ClN2S
6-Amino-N-hydroxy-3-pyridinecarboximidamide 6-Amino-N-hydroxy-3-pyridinecarboximidamide 468068-28-2 C6H8N4O
N-METHYL-3-CYANO-2-HYDROXY-4-METHYLPRIDINE N-METHYL-3-CYANO-2-HYDROXY-4-METHYLPRIDINE
2-METHYLSULFANYL-5-CHLOROPYRIMIDINE 2-METHYLSULFANYL-5-CHLOROPYRIMIDINE 38275-42-2 C5H5ClN2S
2-phenoxypyridin-3-amine 2-phenoxypyridin-3-amine 28664-62-2 C11H10N2O
(isoquinolin-7-yloxy)-acetic acid (isoquinolin-7-yloxy)-acetic acid 86235-60-1 C11H9NO3
N-(4-bromophenyl)-2-chloropyridine-4-carboxamide N-(4-bromophenyl)-2-chloropyridine-4-carboxamide 1019372-53-2 C12H8BrClN2O
5-Pyrimidinamine,  4,6-dimethoxy- 5-Pyrimidinamine, 4,6-dimethoxy- 15846-15-8 C6H9N3O2
2-Pyridinecarboxylic  acid,3-chloro-5-(trifluoromethyl)-,methyl  ester 2-Pyridinecarboxylic acid,3-chloro-5-(trifluoromethyl)-,methyl ester 655235-65-7 C8H5ClF3NO2
2-(1,1-Diethoxymethyl)pyridine-3-boronic acid pinacol ester 2-(1,1-Diethoxymethyl)pyridine-3-boronic acid pinacol ester 1218790-41-0 C16H26BNO4
4-Chloromethyl-6-methyl-chromen-2-one ,97% 4-Chloromethyl-6-methyl-chromen-2-one ,97% 41295-65-2 C11H9ClO2
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