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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
2,4,6-TRICHLORO-5-FLUOROPYRIMIDINE 2,4,6-TRICHLORO-5-FLUOROPYRIMIDINE 6693-08-9 C4Cl3FN2
4-CHLORO-2-(METHYLSULFANYL)PYRIDINE 4-CHLORO-2-(METHYLSULFANYL)PYRIDINE 334542-44-8 C6H6ClNS
METHYL 5-BROMO-4-PYRIMIDINECARBOXYLATE METHYL 5-BROMO-4-PYRIMIDINECARBOXYLATE 1009826-93-0 C6H5BrN2O2
4,6-DICHLORO-2-METHYLPYRIMIDINE-5-CARBALDEHYDE 4,6-DICHLORO-2-METHYLPYRIMIDINE-5-CARBALDEHYDE 14160-91-9 C6H4Cl2N2O
ETHYL 2-(QUINOLIN-6-YL)ACETATE ETHYL 2-(QUINOLIN-6-YL)ACETATE 5622-38-8 C13H13NO2
1-(2-Methylpyridin-3-yl)ethanone 1-(2-Methylpyridin-3-yl)ethanone 1721-12-6 C8H9NO
2-PYRIMIDINAMINE, 5-BROMO-4-CHLORO-6-METHYL- 2-PYRIMIDINAMINE, 5-BROMO-4-CHLORO-6-METHYL- 6314-12-1 C5H5BrClN3
3-PYRIDINAMINE, 5,6-DIBROMO- 3-PYRIDINAMINE, 5,6-DIBROMO- 53242-19-6 C5H4Br2N2
(5-Bromopyrimidin-2-yl)acetic acid (5-Bromopyrimidin-2-yl)acetic acid 1134327-93-7 C6H5BrN2O2
4-(ETHYLAMINO)-3-NITROPYRIDINE 4-(ETHYLAMINO)-3-NITROPYRIDINE 562825-95-0 C7H9N3O2
1-BENZYL-1,2,3,6-TETRAHYDROPYRIDINE-4-BORONIC ACID PINACOL ESTER 1-BENZYL-1,2,3,6-TETRAHYDROPYRIDINE-4-BORONIC ACID PINACOL ESTER 1048976-83-5 C18H26BNO2
5-Hydroxypyrazolo[1,5-a]pyrimidine 5-Hydroxypyrazolo[1,5-a]pyrimidine 29274-22-4 C6H5N3O
5-Chloroimidazol[1,2-a]pyrimidine 5-Chloroimidazol[1,2-a]pyrimidine 944896-82-6 C6H4ClN3
Tetrahydro-1,3(2H)-pyridazinedicarboxylic acid 1-(phenylmethyl) ester Tetrahydro-1,3(2H)-pyridazinedicarboxylic acid 1-(phenylmethyl) ester 72120-54-8 C13H16N2O4
6-cyclopropylpyridazin-3-amine 6-cyclopropylpyridazin-3-amine 1159814-07-9 C7H9N3
5-Iodo-2,3-difluoropyridine 5-Iodo-2,3-difluoropyridine 851386-35-1 C5H2F2IN
4-Chloro-5-fluoro-7H-pyrrolo[2,3-d]-pyrimidine 4-Chloro-5-fluoro-7H-pyrrolo[2,3-d]-pyrimidine 582313-57-3 C6H3ClFN3
5H-Cyclopenta[b]pyridine, 4-chloro-6,7-dihydro- 5H-Cyclopenta[b]pyridine, 4-chloro-6,7-dihydro- 54664-55-0 C8H8ClN
4-Chloro-N-methylpyridine-2-carboxamide Hydrochloride 4-Chloro-N-methylpyridine-2-carboxamide Hydrochloride 882167-77-3 C7H8Cl2N2O
4-MORPHOLINOPYRIDINE 4-MORPHOLINOPYRIDINE 2767-91-1 C9H12N2O
Pyridazine, 3,6-dione, 4-bromo-1,2-dihydro- Pyridazine, 3,6-dione, 4-bromo-1,2-dihydro- 15456-86-7 C4H3BrN2O2
1-(6-Chloropyridazino-3-yl)piperazine 1-(6-Chloropyridazino-3-yl)piperazine 56392-83-7 C8H11ClN4
dimethyl 4-chloropyridine-2,6-dicarboxylate dimethyl 4-chloropyridine-2,6-dicarboxylate 5371-70-0 C9H8ClNO4
2-Pyridinesulfonamide(6CI,7CI,9CI) 2-Pyridinesulfonamide(6CI,7CI,9CI) 63636-89-5 C5H6N2O2S
5-METHOXY-2-[[(4-METHOXY-3,5-DIMETHYL-2-PYRIDINYL)METHYL]THIO]-1H-IMIDAZO[4,5B]PYRIDINE 5-METHOXY-2-[[(4-METHOXY-3,5-DIMETHYL-2-PYRIDINYL)METHYL]THIO]-1H-IMIDAZO[4,5B]PYRIDINE 113713-24-9 C16H18N4O2S
2-ETHYL-5-NITROPYRIDINE 2-ETHYL-5-NITROPYRIDINE 31557-73-0 C7H8N2O2
2-Nitro-3-hydroxypyridine 2-Nitro-3-hydroxypyridine 15128-08-2 C5H4N2O3
3-(2-Aminopyrimidin-5-yl)benzoic acid 3-(2-Aminopyrimidin-5-yl)benzoic acid 914349-45-4 C11H9N3O2
2-Chloro-5-methoxy-3-nitropyridine 2-Chloro-5-methoxy-3-nitropyridine 1003711-55-4 C6H5ClN2O3
2-Chloro-4-(4-methoxyphenyl)pyrimidine 2-Chloro-4-(4-methoxyphenyl)pyrimidine 75634-04-7 C11H9ClN2O
6-Chloro-N-cyclopropyl-2-(methylthio)pyrimidin-4-amine 6-Chloro-N-cyclopropyl-2-(methylthio)pyrimidin-4-amine 951884-05-2 C8H10ClN3S
6-Bromo-3-chloro-2-methyl-pyridine 6-Bromo-3-chloro-2-methyl-pyridine 944317-27-5 C6H5BrClN
5H-cyclopenta[b]pyridin-7-ol,6,7-dihydro-,(7S)- 5H-cyclopenta[b]pyridin-7-ol,6,7-dihydro-,(7S)- 887921-99-5 C8H9NO
Pyridine, 5-hydrazinyl-2-methyl-, hydrochloride (1:1) Pyridine, 5-hydrazinyl-2-methyl-, hydrochloride (1:1) 896133-77-0 C6H10ClN3
1-(5-Nitropyridin-2-yl)-4-piperidinamine 1-(5-Nitropyridin-2-yl)-4-piperidinamine 252577-85-8 C10H14N4O2
2-FLUORO-3-IODO-6-METHYLPYRIDINE 2-FLUORO-3-IODO-6-METHYLPYRIDINE 884494-48-8 C6H5FIN
6-Hydroxy-2-(pyridin-2-yl)pyrimidin-4(3H)-one 6-Hydroxy-2-(pyridin-2-yl)pyrimidin-4(3H)-one 10198-74-0 C9H7N3O2
6-BROMO-4-METHYLPYRIDINE-3-BORONIC ACID 6-BROMO-4-METHYLPYRIDINE-3-BORONIC ACID 1072945-75-5 C6H7BBrNO2
4-CHLORO-5-HYDRAZINOPYRIDAZIN-3(2H)-ONE 4-CHLORO-5-HYDRAZINOPYRIDAZIN-3(2H)-ONE 6959-56-4 C4H5ClN4O
2,3-DIBROMOPYRIDINE-4-CARBOXYLIC ACID 2,3-DIBROMOPYRIDINE-4-CARBOXYLIC ACID 1020056-98-7 C6H3Br2NO2
2-Amino-5-ethyl-pyridine 2-Amino-5-ethyl-pyridine 19842-07-0 C7H10N2
Ethyl (6-aminopyridin-2-yl)acetate Ethyl (6-aminopyridin-2-yl)acetate 71469-82-4 C9H12N2O2
3-(BOC-AMINO)PYRIDINE 3-(BOC-AMINO)PYRIDINE 56700-70-0 C10H14N2O2
6-CHLORO-N-METHYLPYRIDIN-2-AMINE 6-CHLORO-N-METHYLPYRIDIN-2-AMINE 89026-78-8 C6H7ClN2
4-CHLORO-2,6-DIPHENYLPYRIMIDINE 4-CHLORO-2,6-DIPHENYLPYRIMIDINE 29509-91-9 C16H11ClN2
5-BROMO-4-CHLORO-6-METHYLPYRIMIDINE 5-BROMO-4-CHLORO-6-METHYLPYRIMIDINE 3438-55-9 C5H4BrClN2
3-CHLORO-2-METHYL-5-(TRIFLUOROMETHYL)PYRIDINE 3-CHLORO-2-METHYL-5-(TRIFLUOROMETHYL)PYRIDINE 175277-30-2 C7H5ClF3N
6-PHENYLNICOTINIC ACID 6-PHENYLNICOTINIC ACID 29051-44-3 C12H9NO2
2,4-DIBROMO-5-FLUORO-3-NITROPYRIDINE 2,4-DIBROMO-5-FLUORO-3-NITROPYRIDINE 884494-91-1 C5HBr2FN2O2
3-(CHLOROMETHYL)THIOPHENE 3-(CHLOROMETHYL)THIOPHENE 2746-23-8 C5H5ClS
2-chloro-5-methylthieno[2,3-d]pyrimidine 2-chloro-5-methylthieno[2,3-d]pyrimidine 83259-31-8 C7H5ClN2S
6-bromoisoquinolin-3-amine 6-bromoisoquinolin-3-amine 891785-28-7 C9H7BrN2
7-benzyl-4-chloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-amine 7-benzyl-4-chloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-amine 859825-79-9 C14H15ClN4
7-bromothieno[3,2-d]pyrimidine 7-bromothieno[3,2-d]pyrimidine 21586-25-4 C6H3BrN2S
2,3,5,6-TETRAFLUOROPYRIDINE-4-CARBOXYLIC ACID 2,3,5,6-TETRAFLUOROPYRIDINE-4-CARBOXYLIC ACID 2875-10-7 C6HF4NO2
1-(4-TRIFLUOROMETHYL-PYRIMIDIN-2-YL)-PIPERIDIN-4-OL 1-(4-TRIFLUOROMETHYL-PYRIMIDIN-2-YL)-PIPERIDIN-4-OL 401930-07-2 C10H12F3N3O
5-Methyl-2-pyridinesulfonamide 5-Methyl-2-pyridinesulfonamide 65938-77-4 C6H8N2O2S
DIHYDROETHIDIUM DIHYDROETHIDIUM 104821-25-2 C21H21N3
6-BROMONICOTINAMIDE 6-BROMONICOTINAMIDE 889676-37-3 C6H5BrN2O
4-AMINO-2-MERCAPTOPYRIMIDINE-5-CARBONITRILE 4-AMINO-2-MERCAPTOPYRIMIDINE-5-CARBONITRILE 16462-26-3 C5H4N4S
METHYL 4-AMINO-1-BENZYL-1,2,5,6-TETRAHYDROPYRIDINE-3-CARBOXYLATE, 99 METHYL 4-AMINO-1-BENZYL-1,2,5,6-TETRAHYDROPYRIDINE-3-CARBOXYLATE, 99 159660-85-2 C14H18N2O2
OXIDIZED NIFEDIPINE OXIDIZED NIFEDIPINE 67035-22-7 C17H16N2O6
2 4-DIMETHOXY-5-METHYLPYRIMIDINE  97 2 4-DIMETHOXY-5-METHYLPYRIMIDINE 97 5151-34-8 C7H10N2O2
ETHYL 2-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLATE ETHYL 2-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLATE 304693-64-9 C8H7F3N2O2
2-BROMO-5-METHYLPYRIMIDINE 2-BROMO-5-METHYLPYRIMIDINE 150010-20-1 C5H5BrN2
2,4,6-TRIBROMOPYRIMIDINE 2,4,6-TRIBROMOPYRIMIDINE 36847-11-7 C4HBr3N2
5-(2-PYRIDYL)THIOPHENE-2-SULFONYL CHLORIDE 5-(2-PYRIDYL)THIOPHENE-2-SULFONYL CHLORIDE 151858-64-9 C9H6ClNO2S2
5-CHLORO-2-FLUORO-4-IODOPYRIDINE 5-CHLORO-2-FLUORO-4-IODOPYRIDINE C5H2ClFIN
2,3-DIBROMO-6-CHLOROPYRIDINE 2,3-DIBROMO-6-CHLOROPYRIDINE 885952-16-9 C5H2Br2ClN
3-BROMOIMIDAZO[1,2-A]PYRIDINE-6-CARBONITRILE 3-BROMOIMIDAZO[1,2-A]PYRIDINE-6-CARBONITRILE 885950-21-0 C8H4BrN3
Clopyralid (2-hydroxyethyl)ammonium Clopyralid (2-hydroxyethyl)ammonium 57754-85-5 C8H10Cl2N2O3
1-ETHYL-3-(HYDROXYMETHYL)PYRIDINIUM ETHYL SULFATE 1-ETHYL-3-(HYDROXYMETHYL)PYRIDINIUM ETHYL SULFATE 1064704-03-5 C10H17NO5S
QUINOLINE-3-CARBOXYLIC ACID ETHYL ESTER QUINOLINE-3-CARBOXYLIC ACID ETHYL ESTER 50741-46-3 C12H11NO2
2-METHYL-3-PYRIDINOL HYDROCHLORIDE 2-METHYL-3-PYRIDINOL HYDROCHLORIDE 90724-46-2 C6H8ClNO
2-THIENYLZINC BROMIDE 2-THIENYLZINC BROMIDE 45438-80-0 C4H3BrSZn
2,3-DINITROPYRIDINE 2,3-DINITROPYRIDINE 14916-60-0 C5H3N3O4
2,4-DIAMINO-6-MERCAPTOPYRIMIDINE HEMISULFATE 2,4-DIAMINO-6-MERCAPTOPYRIMIDINE HEMISULFATE 81012-96-6 C4H8N4O4S2
7,8-DIHYDROISOQUINOLIN-5(6H)-ONE 7,8-DIHYDROISOQUINOLIN-5(6H)-ONE 21917-86-2 C9H9NO
2,3,5-TRIBROMO-4-METHYLPYRIDINE 2,3,5-TRIBROMO-4-METHYLPYRIDINE 3430-25-9 C6H4Br3N
4-METHOXY-3-NITROPYRIDINE HYDROCHLORIDE 4-METHOXY-3-NITROPYRIDINE HYDROCHLORIDE 31872-61-4 C6H7ClN2O3
2-CHLOROPYRIDINE-5-ACETIC ACID ETHYL ESTER 2-CHLOROPYRIDINE-5-ACETIC ACID ETHYL ESTER 197376-47-9 C9H10ClNO2
5-Chloro-2-methoxypyridine-3-boronic acid 5-Chloro-2-methoxypyridine-3-boronic acid 943153-22-8 C6H7BClNO3
5,6-DIAMINO-2,3-DICYANOPYRAZINE 5,6-DIAMINO-2,3-DICYANOPYRAZINE 36023-58-2 C6H4N6
3-HYDROXYPYRIDINE-2-SULFONIC ACID 3-HYDROXYPYRIDINE-2-SULFONIC ACID 88511-41-5 C5H5NO4S
2-BENZYLOXY-3-HYDROXYPYRIDINE 2-BENZYLOXY-3-HYDROXYPYRIDINE 885952-26-1 C12H11NO2
5-BROMO-2-CHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 5-BROMO-2-CHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073354-79-6 C11H14BBrClNO2
CHEMBRDG-BB 9070750 CHEMBRDG-BB 9070750 51639-58-8 C8H12N2
(3,5-DIFLUOROPYRIDIN-4-YL)BORONIC ACID (3,5-DIFLUOROPYRIDIN-4-YL)BORONIC ACID 956003-87-5 C5H4BF2NO2
2-AMINO-3-IODO-5-METHYLPYRIDINE 2-AMINO-3-IODO-5-METHYLPYRIDINE 211308-79-1 C6H7IN2
5-BORONOPICOLINIC ACID 5-BORONOPICOLINIC ACID 913836-11-0 C6H6BNO4
2-(HYDROXYMETHYL)PYRIDINE-5-BORONIC ACID 2-(HYDROXYMETHYL)PYRIDINE-5-BORONIC ACID 913835-98-0 C6H8BNO3
2-BROMO-3-IODO-5-METHYLPYRIDINE 2-BROMO-3-IODO-5-METHYLPYRIDINE 65550-82-5 C6H5BrIN
HEXAHYDROPYRIDAZINE DIHYDROCHLORIDE HEXAHYDROPYRIDAZINE DIHYDROCHLORIDE 124072-89-5 C4H12Cl2N2
6-Chloro-N-ethylpyrimidin-4-amine 6-Chloro-N-ethylpyrimidin-4-amine 872511-30-3 C6H8ClN3
5-Bromo-4-(4-methylphenyl)pyrimidine 5-Bromo-4-(4-methylphenyl)pyrimidine 149323-50-2 C11H9BrN2
5-Bromo-N-isopropylpicolinamide 5-Bromo-N-isopropylpicolinamide 845305-90-0 C9H11BrN2O
6-Acetamidopicolinic acid, 6-(Acetylamino)pyridine-2-carboxylic acid 6-Acetamidopicolinic acid, 6-(Acetylamino)pyridine-2-carboxylic acid 26893-72-1 C8H8N2O3
2-(DIMETHYLAMINO)PYRIMIDINE 2-(DIMETHYLAMINO)PYRIMIDINE C6H9N3
8-Isoquinolinecarbonitrile(9CI) 8-Isoquinolinecarbonitrile(9CI) 362606-11-9 C10H6N2
N-ACETYLHOMOPIPERAZINE N-ACETYLHOMOPIPERAZINE 61903-11-5 C7H14N2O
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