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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-Pyridinemethanamine,2-methoxy-(9CI) 3-Pyridinemethanamine,2-methoxy-(9CI) 354824-19-4 C7H10N2O
2-Pyridinamine,5-fluoro-6-methyl-(9CI) 2-Pyridinamine,5-fluoro-6-methyl-(9CI) 110919-71-6 C6H7FN2
1H-Pyrrolo[2,3-c]pyridine,7-methoxy-(9CI) 1H-Pyrrolo[2,3-c]pyridine,7-methoxy-(9CI) 160590-40-9 C8H8N2O
2-Pyrimidinecarboxylicacid,5-methyl-,methylester(6CI,9CI) 2-Pyrimidinecarboxylicacid,5-methyl-,methylester(6CI,9CI) 76196-80-0 C7H8N2O2
3-Quinolinamine,5,6,7,8-tetrahydro-(9CI) 3-Quinolinamine,5,6,7,8-tetrahydro-(9CI) 151224-99-6 C9H12N2
2-Pyrimidinecarboxylicacid,ethylester(7CI,9CI) 2-Pyrimidinecarboxylicacid,ethylester(7CI,9CI) 42839-08-7 C7H8N2O2
N-Ethyl 5-bromopicolinamide N-Ethyl 5-bromopicolinamide 845305-88-6 C8H9BrN2O
Ethyl 7-chloro-4-hydroxy-8-methylquinoline-3-carboxylate Ethyl 7-chloro-4-hydroxy-8-methylquinoline-3-carboxylate 5350-94-7 C13H12ClNO3
3,4-Pyridinediamine,5-methyl-(9CI) 3,4-Pyridinediamine,5-methyl-(9CI) 13958-86-6 C6H9N3
1H-Pyrazolo[4,3-b]pyridine,3-methyl-(9CI) 1H-Pyrazolo[4,3-b]pyridine,3-methyl-(9CI) 194278-45-0 C7H7N3
5-fluoro-2-methoxy-3-pyridineboronic acid 5-fluoro-2-methoxy-3-pyridineboronic acid 957120-32-0 C6H7BFNO3
4-BROMO-3,5-DIMETHYLPYRIDINE 4-BROMO-3,5-DIMETHYLPYRIDINE 201286-65-9 C7H8BrN
2-Pyridinecarboxylicacid,3,5-dimethyl-(9CI) 2-Pyridinecarboxylicacid,3,5-dimethyl-(9CI) 4733-68-0 C8H9NO2
4-chloro-6,7-dihydro-5H-cyclopenta[b]pyridin-7-yl acetate 4-chloro-6,7-dihydro-5H-cyclopenta[b]pyridin-7-yl acetate 945666-87-5 C10H10ClNO2
2-Chloro-4-methoxy-5-nitropyridine 2-Chloro-4-methoxy-5-nitropyridine 607373-83-1 C6H5ClN2O3
1-(5-Methyl-2-pyridinyl)-4-piperidinol 1-(5-Methyl-2-pyridinyl)-4-piperidinol 158181-84-1 C11H16N2O
5-(HYDROXYMETHYL)-2-METHYLPYRIMIDIN-4-OL 5-(HYDROXYMETHYL)-2-METHYLPYRIMIDIN-4-OL 698-30-6 C6H8N2O2
2-CHLORO-5-METHYLPYRIDINE-3-CARBALDEHYDE 2-CHLORO-5-METHYLPYRIDINE-3-CARBALDEHYDE 92444-99-0 C7H6ClNO
3-BROMO-2-CHLORO-4-IODOPYRIDINE 3-BROMO-2-CHLORO-4-IODOPYRIDINE 884494-53-5 C5H2BrClIN
N-Boc-5-amino-2-fluoropyridine N-Boc-5-amino-2-fluoropyridine 171178-41-9 C10H13FN2O2
5-CYANOPYRIDINE-2-BORONIC ACID PINACOL ESTER 5-CYANOPYRIDINE-2-BORONIC ACID PINACOL ESTER 1073353-83-9 C12H15BN2O2
3-BROMO-2,5-DIAMINOPYRIDINE 3-BROMO-2,5-DIAMINOPYRIDINE 114292-91-0 C5H6BrN3
4-CHLORO-6-MORPHOLIN-4-YL-PYRIMIDIN-2-YLAMINE 4-CHLORO-6-MORPHOLIN-4-YL-PYRIMIDIN-2-YLAMINE C8H11ClN4O
ETHYL 7-AMINO-2-(METHYLTHIO)[1,2,4]TRIAZOLO[1,5-A]PYRIMIDINE-6-CARBOXYLATE ETHYL 7-AMINO-2-(METHYLTHIO)[1,2,4]TRIAZOLO[1,5-A]PYRIMIDINE-6-CARBOXYLATE 90559-98-1 C9H11N5O2S
2-Pyridylamid oxime 2-Pyridylamid oxime 1772-01-6 C6H7N3O
PIPERIDINE-4-CARBOXYLIC ACID (4-METHYL-PYRIDIN-2-YL)-AMIDE PIPERIDINE-4-CARBOXYLIC ACID (4-METHYL-PYRIDIN-2-YL)-AMIDE 865078-92-8 C12H17N3O
6-METHYL-4-(TRIFLUOROMETHYL)-2(1H)-PYRIDONE 6-METHYL-4-(TRIFLUOROMETHYL)-2(1H)-PYRIDONE 22123-19-9 C7H6F3NO
2-HYDROXY-4-FLUOROPYRIDINE 2-HYDROXY-4-FLUOROPYRIDINE 96530-75-5 C5H4FNO
4-FLUORO-PYRIDINE-2-CARBOXYLIC ACID 4-FLUORO-PYRIDINE-2-CARBOXYLIC ACID 886371-78-4 C6H4FNO2
2-CHLORO-3-CYANOPYRIDIN-4-YLBORONIC ACID 2-CHLORO-3-CYANOPYRIDIN-4-YLBORONIC ACID 878194-88-8 C6H4BClN2O2
2-AMINO-5-BROMO-6-METHYLPYRAZINE 2-AMINO-5-BROMO-6-METHYLPYRAZINE 74290-69-0 C5H6BrN3
1-(2-Pyrimidinyl)-4-piperidinamine hydrochloride 1-(2-Pyrimidinyl)-4-piperidinamine hydrochloride 848500-38-9 C9H15ClN4
2,5,6-TRICHLORO-3-TRIFLUOROMETHYLPYRIDINE 2,5,6-TRICHLORO-3-TRIFLUOROMETHYLPYRIDINE 80289-91-4 C6HCl3F3N
5-AMINO-2H-ISOQUINOLIN-1-ONE 5-AMINO-2H-ISOQUINOLIN-1-ONE 93117-08-9 C9H8N2O
mesoridazine mesoridazine 5588-33-0 C21H26N2OS2
3-Pyridinemethanamine 1-oxide 3-Pyridinemethanamine 1-oxide 106940-10-7 C6H8N2O
Benzothiophene-2-carbonitrile Benzothiophene-2-carbonitrile 55219-11-9 C9H5NS
3-Chloro-6-(1H-imidazol-1-yl)pyridazine 3-Chloro-6-(1H-imidazol-1-yl)pyridazine 71037-71-3 C7H5ClN4
Ethyl 6-bromoimidazo[1,2-a]pyridine-2-carboxylate Ethyl 6-bromoimidazo[1,2-a]pyridine-2-carboxylate 67625-37-0 C10H9BrN2O2
5-Bromo-2-chloro-4-(dimethylamino)pyrimidine 5-Bromo-2-chloro-4-(dimethylamino)pyrimidine 57054-86-1 C6H7BrClN3
6-Propoxypyridazin-3-amine 6-Propoxypyridazin-3-amine 90008-50-7 C7H11N3O
2-Fluoro-5-methyl-3-nitropyridine 2-Fluoro-5-methyl-3-nitropyridine 19346-44-2 C6H5FN2O2
4-Amino-3-methoxypyridine 4-Amino-3-methoxypyridine 52334-90-4 C6H8N2O
5-Chloro-2-methylpyrimidine 5-Chloro-2-methylpyrimidine 54198-89-9 C5H5ClN2
4-(6-Chloro-pyrazin-2-yl)-3-methyl-benzoicacid 4-(6-Chloro-pyrazin-2-yl)-3-methyl-benzoicacid 1020718-71-1 C12H9ClN2O2
5-BROMO-8-ISOQUINOLINEAMINE 5-BROMO-8-ISOQUINOLINEAMINE 90721-35-0 C9H7BrN2
4-CHLORO-7-HYDROXY-6-METHOXY-QUINOLINE-3-CARBONITRILE 4-CHLORO-7-HYDROXY-6-METHOXY-QUINOLINE-3-CARBONITRILE 263149-10-6 C11H7ClN2O2
5-Chlorothiophen-2-YlboronicAcid 5-Chlorothiophen-2-YlboronicAcid 162607-48-3 C4H4BClO2S
5-IODO-1H-PYRIMIDIN-4-ONE 5-IODO-1H-PYRIMIDIN-4-ONE 4349-07-9 C4H3IN2O
1H-Pyrrolo[3,2-c]pyridine, 6-methyl- 1H-Pyrrolo[3,2-c]pyridine, 6-methyl- 183586-34-7 C8H8N2
2,4,5-Triamino-pyridine 2,4,5-Triamino-pyridine 23244-87-3 C5H8N4
4-Amino-5-nitro-2-pyridinol 4-Amino-5-nitro-2-pyridinol 99479-77-3 C5H5N3O3
Pyrimidine, 2-amino-5-cyclopropyl- (8CI) Pyrimidine, 2-amino-5-cyclopropyl- (8CI) 21573-16-0 C7H9N3
Pyrazinecarbonitrile, 6-amino- (9CI) Pyrazinecarbonitrile, 6-amino- (9CI) 59489-39-3 C5H4N4
6-FLUOROTHYMINE 6-FLUOROTHYMINE 31458-36-3 C5H5FN2O2
3-Chloropyridazin-4-amine 3-Chloropyridazin-4-amine 55928-83-1 C4H4ClN3
5-BROMO-2-METHOXYPYRIMIDIN-4-YLAMINE 5-BROMO-2-METHOXYPYRIMIDIN-4-YLAMINE 148214-56-6 C5H6BrN3O
5-AMINO-4-BROMOPYRIMIDINE 5-AMINO-4-BROMOPYRIMIDINE 849353-34-0 C4H4BrN3
4-AMINO-6-MORPHOLINOPYRIMIDINE 4-AMINO-6-MORPHOLINOPYRIMIDINE 96225-80-8 C8H12N4O
3-FLUORO-2-IODOPYRIDINE-4-CARBOXYLIC ACID 3-FLUORO-2-IODOPYRIDINE-4-CARBOXYLIC ACID 153035-09-7 C6H3FINO2
1-BENZOTHIEN-4-YLAMINE 1-BENZOTHIEN-4-YLAMINE 17402-83-4 C8H7NS
2-ISOBUTYL-3-METHYLPYRAZINE 2-ISOBUTYL-3-METHYLPYRAZINE 13925-06-9 C9H14N2
4-HYDROXY-2-METHYLQUINOLINE-6-CARBOXYLIC ACID ETHYL ESTER 4-HYDROXY-2-METHYLQUINOLINE-6-CARBOXYLIC ACID ETHYL ESTER 300590-94-7 C13H13NO3
5-METHOXYPYRIDAZIN-3(2H)-ONE 5-METHOXYPYRIDAZIN-3(2H)-ONE 123696-01-5 C5H6N2O2
7-BROMOPYRIDO[2,3-B]PYRAZINE-2,3(1H,4H)-DIONE 7-BROMOPYRIDO[2,3-B]PYRAZINE-2,3(1H,4H)-DIONE 168123-82-8 C7H4BrN3O2
6-T-BUTYL-4-PIPERAZINOTHIENO[3,2-D]PYRIMIDINE 6-T-BUTYL-4-PIPERAZINOTHIENO[3,2-D]PYRIMIDINE 683274-69-3 C14H20N4S
2-MERCAPTO-4,6-DIMETHYLPYRIMIDINE SODIUM SALT 2-MERCAPTO-4,6-DIMETHYLPYRIMIDINE SODIUM SALT 41840-27-1 C6H9N2NaS
4-HYDROXY-6-METHOXYMETHYL-2-(METHYLTHIO)PYRIMIDINE 4-HYDROXY-6-METHOXYMETHYL-2-(METHYLTHIO)PYRIMIDINE 68087-13-8 C7H10N2O2S
2-BROMOPYRIDINE-4-N-METHYLCARBOXAMIDE 2-BROMOPYRIDINE-4-N-METHYLCARBOXAMIDE 337536-01-3 C7H7BrN2O
4-METHOXYPYRIDAZINE 4-METHOXYPYRIDAZINE 20733-11-3 C5H6N2O
2-AMINO-6-CHLORO-3,5-DICYANOPYRIDINE 2-AMINO-6-CHLORO-3,5-DICYANOPYRIDINE 51768-01-5 C7H3ClN4
BIS(2-THIENYL) KETONE BIS(2-THIENYL) KETONE 704-38-1 C9H6OS2
2-(BOC-AMINO)-6-PICOLINE 2-(BOC-AMINO)-6-PICOLINE 90101-22-7 C11H16N2O2
1-(PYRIDIN-4-YL)-PIPERIDINE-4-CARBOXYLIC ACID 1-(PYRIDIN-4-YL)-PIPERIDINE-4-CARBOXYLIC ACID 93913-86-1 C11H14N2O2
(5-BROMOTHIEN-2-YL)METHANOL (5-BROMOTHIEN-2-YL)METHANOL 79387-71-6 C5H5BrOS
3-QUINOLINEBORONIC ACID HYDROCHLORIDE 3-QUINOLINEBORONIC ACID HYDROCHLORIDE 850568-71-7 C9H9BClNO2
2,4-DICHLOROTHIENO[3,2-D]PYRIMIDINE 2,4-DICHLOROTHIENO[3,2-D]PYRIMIDINE C6H2Cl2N2S
1-(6-METHYL-PYRIDIN-2-YL)-ETHYLAMINE 1-(6-METHYL-PYRIDIN-2-YL)-ETHYLAMINE 58088-67-8 C8H12N2
2-(TRIBUTYLSTANNYL)PYRAZINE 2-(TRIBUTYLSTANNYL)PYRAZINE 205371-27-3 C16H30N2Sn
NICOTINANILIDE NICOTINANILIDE 1752-96-1 C12H10N2O
2-CHLORO-5-N-NONYLPYRIMIDINE 2-CHLORO-5-N-NONYLPYRIMIDINE 219581-06-3 C13H21ClN2
1,2-DIMETHYL-PIPERAZINE 1,2-DIMETHYL-PIPERAZINE 25057-77-6 C6H14N2
4'-(4-METHOXYPHENYL)-2,2':6',2''-TERPYRIDINE 4'-(4-METHOXYPHENYL)-2,2':6',2''-TERPYRIDINE 13104-56-8 C22H17N3O
N-Boc-3,4-dihydro-2H-pyridine N-Boc-3,4-dihydro-2H-pyridine 131667-57-7 C10H17NO2
2-METHYL-3-ISOPROPOXYPYRAZINE 2-METHYL-3-ISOPROPOXYPYRAZINE 94089-22-2 C8H12N2O
3,5-DIBROMO-4-NITROPYRIDINE 3,5-DIBROMO-4-NITROPYRIDINE 121263-11-4 C5H2Br2N2O2
2-FLUORO-6-HYDROXYMETHYL PYRIDINE 2-FLUORO-6-HYDROXYMETHYL PYRIDINE 315180-17-7 C6H6FNO
3-AMINO-5-HYDROXYMETHYLPYRIDINE 3-AMINO-5-HYDROXYMETHYLPYRIDINE 443649-18-1 C6H8N2O
2-Formyl-3,4-dihydro-2H-pyran 2-Formyl-3,4-dihydro-2H-pyran 100-73-2 C6H8O2
8-HYDROXYQUINOLINE-5-SULFONIC ACID 8-HYDROXYQUINOLINE-5-SULFONIC ACID 207386-92-3 C9H7NO4S
ETHYL IMIDAZO[1,2-A]PYRIDINE-7-CARBOXYLATE 98 ETHYL IMIDAZO[1,2-A]PYRIDINE-7-CARBOXYLATE 98 372147-49-4 C10H10N2O2
2-(4-PENTYNYLOXY)TETRAHYDRO-2H-PYRAN  9& 2-(4-PENTYNYLOXY)TETRAHYDRO-2H-PYRAN 9& 62992-46-5 C10H16O2
2-CHLORO-5-METHYLPYRIDIN-3-AMINE 2-CHLORO-5-METHYLPYRIDIN-3-AMINE C6H7ClN2
2-BROMO-3-FLUORO-4-METHYLPYRIDINE 2-BROMO-3-FLUORO-4-METHYLPYRIDINE C6H5BrFN
3,5-DIBROMO-2-IODOPYRIDINE 3,5-DIBROMO-2-IODOPYRIDINE 436799-34-7 C5H2Br2IN
2-T-BUTYLTHIOPHENE 2-T-BUTYLTHIOPHENE 1689-78-7 C8H12S
Copper Pyrithione Copper Pyrithione 14915-37-8 C10H8CuN2O2S2
2-AMINO-3,6-DIFLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 2-AMINO-3,6-DIFLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 675602-89-8 C6H3F5N2
2-CHLORO-5-IODO-PYRIDIN-3-YLAMINE 2-CHLORO-5-IODO-PYRIDIN-3-YLAMINE 426463-09-4 C5H4ClIN2
ETHYL 2-CHLORO-6-METHYLPYRIMIDINE-4-CARBOXYLATE ETHYL 2-CHLORO-6-METHYLPYRIMIDINE-4-CARBOXYLATE 265328-14-1 C8H9ClN2O2
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