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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
3,4-Dichloro-2-Picoline 3,4-Dichloro-2-Picoline 103949-58-2 C6H5Cl2N
3,5-DINITRO-4-HYDROXYPYRIDINE 3,5-DINITRO-4-HYDROXYPYRIDINE 10425-71-5 C5H3N3O5
4-Ethoxy-2-Fluoropyridine 4-Ethoxy-2-Fluoropyridine 175965-82-9 C7H8FNO
2-Fluoro-4-Bromo-3-Picoline 2-Fluoro-4-Bromo-3-Picoline 128071-79-4 C6H5BrFN
Tetrahydro-4H-Pyran-4-one Tetrahydro-4H-Pyran-4-one 143562-54-3
7-Methylimidazo(1,2-a)pyridine 7-Methylimidazo(1,2-a)pyridine 874-39-5 C8H8N2
Ethanone, 1-(5-hydroxy-2-pyridinyl)- (9CI) Ethanone, 1-(5-hydroxy-2-pyridinyl)- (9CI) 67310-56-9 C7H7NO2
Pyrimidine, 2-(chloromethyl)-5-methyl Pyrimidine, 2-(chloromethyl)-5-methyl 126504-85-6 C6H7ClN2
2-BENZYLAMINO-4-BENZYLOXY-5-BROMOPYRIMIDINE 2-BENZYLAMINO-4-BENZYLOXY-5-BROMOPYRIMIDINE 885952-25-0 C18H16BrN3O
2-Methanesulfonyl-pyrimidine-4-carbaldehyde 2-Methanesulfonyl-pyrimidine-4-carbaldehyde 874279-27-3 C6H6N2O3S
Pyridine, 4-(bromomethyl)- (9CI) Pyridine, 4-(bromomethyl)- (9CI) 54751-01-8 C6H6BrN
2-(METHYLTHIO)-3-ETHYLPYRAZINE 2-(METHYLTHIO)-3-ETHYLPYRAZINE 72987-62-3 C7H10N2S
2-PHENOXYPYRIDINE 2-PHENOXYPYRIDINE 4783-68-0 C11H9NO
4(1H)-Pyrimidinone, 2-methoxy- (9CI) 4(1H)-Pyrimidinone, 2-methoxy- (9CI) 25902-86-7 C5H6N2O2
2-BROMO-3-HYDROXYPYRIDINE-N-OXIDE 2-BROMO-3-HYDROXYPYRIDINE-N-OXIDE 6602-29-5 C5H4BrNO2
(6-bromo-3H-imidazo[4,5-b]pyridin-2-yl)methanol (6-bromo-3H-imidazo[4,5-b]pyridin-2-yl)methanol 172648-19-0 C7H6BrN3O
2-Benzyloxy-pyridine-5-boronic acid 2-Benzyloxy-pyridine-5-boronic acid 929250-35-1 C12H12BNO3
2-Bromo-3-fluoro-5-(trifluoromethyl)pyridine 2-Bromo-3-fluoro-5-(trifluoromethyl)pyridine 89402-29-9 C6H2BrF4N
5-bromo-3-chloropyridine-2-carbonitrile 5-bromo-3-chloropyridine-2-carbonitrile 945557-04-0 C6H2BrClN2
4-chloropyrimidine hydrochloride 4-chloropyrimidine hydrochloride 179051-78-6 C4H4Cl2N2
3,5-Dimethyl-2-chloropyridine 3,5-Dimethyl-2-chloropyridine 72093-12-0 C7H8ClN
5-Chloro-2-methyl-3-nitropyridine 5-Chloro-2-methyl-3-nitropyridine 1211533-93-5 C6H5ClN2O2
5-CYANOPYRIDIN-2-YL-2-BORONIC ACID 5-CYANOPYRIDIN-2-YL-2-BORONIC ACID 910547-29-4 C6H5BN2O2
URACIL-4-ACETIC ACID URACIL-4-ACETIC ACID 4628-39-1 C6H6N2O4
3-(2-METHYL-1,3-DIOXOLAN-2-YL)-6-METHYLPYRIDINE 3-(2-METHYL-1,3-DIOXOLAN-2-YL)-6-METHYLPYRIDINE 184766-45-8 C10H13NO2
4-CHLORO-5-METHYL-6-PHENYLTHIENO[2,3-D]PYRIMIDINE 4-CHLORO-5-METHYL-6-PHENYLTHIENO[2,3-D]PYRIMIDINE 306934-78-1 C13H9ClN2S
2-(DIMETHYLVINYLSILYL)PYRIDINE 2-(DIMETHYLVINYLSILYL)PYRIDINE 321155-39-9 C9H13NSi
3-AMINO-6-PHENYLPYRIDAZINE 3-AMINO-6-PHENYLPYRIDAZINE 14966-91-7 C10H9N3
TETRAHYDRO-2H-PYRAN-4-CARBOXAMIDE TETRAHYDRO-2H-PYRAN-4-CARBOXAMIDE 344329-76-6 C6H11NO2
4-PYRIDYLETHYLMERCAPTAN 4-PYRIDYLETHYLMERCAPTAN C7H9NS
2,4-DICHLORO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIMIDINE 2,4-DICHLORO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIMIDINE 1073354-24-1 C10H13BCl2N2O2
1,3-DIMETHYL-2,4-DIOXO-1,2,3,4-TETRAHYDROPYRIMIDINE-5-CARBALDEHYDE 1,3-DIMETHYL-2,4-DIOXO-1,2,3,4-TETRAHYDROPYRIMIDINE-5-CARBALDEHYDE C7H8N2O3
ETHYL 4-HYDROXY-6-METHYL-2-OXO-1,2-DIHYDROPYRIDINE-3-CARBOXYLATE ETHYL 4-HYDROXY-6-METHYL-2-OXO-1,2-DIHYDROPYRIDINE-3-CARBOXYLATE 10350-10-4 C9H11NO4
2-AMINO-3-BROMO-5,6-DIMETHYLPYRIDINE 2-AMINO-3-BROMO-5,6-DIMETHYLPYRIDINE 161091-49-2 C7H9BrN2
1,1'-THIOCARBONYLDI-2(1H)-PYRIDONE 1,1'-THIOCARBONYLDI-2(1H)-PYRIDONE 102368-13-8 C11H8N2O2S
4-METHYL-PYRIDINE-2,3-DIAMINE 4-METHYL-PYRIDINE-2,3-DIAMINE 53929-59-2 C6H9N3
IFLAB-BB F2124-0044 IFLAB-BB F2124-0044 30321-94-9 C6H5BrN2O4S
6-METHYL-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 6-METHYL-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 104408-25-5 C6H10ClN3
1-Formylhomopiperazine 1-Formylhomopiperazine 29053-62-1 C6H12N2O
Isoquinoline-4-carboxylic acid Isoquinoline-4-carboxylic acid 7159-36-6 C10H7NO2
METHYL 3-METHOXYTHIOPHENE-2-CARBOXYLATE METHYL 3-METHOXYTHIOPHENE-2-CARBOXYLATE 62353-75-7 C7H8O3S
PYRAZINE-2,3-DICARBOXYLIC ACID MONOAMIDE PYRAZINE-2,3-DICARBOXYLIC ACID MONOAMIDE 67367-37-7 C6H5N3O3
3,5-DIMETHYLPYRIDINE-N-OXIDE 3,5-DIMETHYLPYRIDINE-N-OXIDE 3718-65-8 C7H9NO
6-METHYL-2-PHENYL-4(1H)PYRIMIDINONE 6-METHYL-2-PHENYL-4(1H)PYRIMIDINONE 13514-79-9 C11H10N2O
2-CHLOROMETHYL-3,4-DIMETHOXY PYRIDINE HYDROCHLORIDE 2-CHLOROMETHYL-3,4-DIMETHOXY PYRIDINE HYDROCHLORIDE 169905-10-6 C8H10ClNO2
4-CHLORO-3(2H)-PYRIDAZINONE 4-CHLORO-3(2H)-PYRIDAZINONE 1677-79-8 C4H3ClN2O
2,5-Dimethylpiperazine 2,5-Dimethylpiperazine 106-55-8 C6H14N2
ETHYL-4-METHYL PYRIMIDINE-5-CARBOXYLATE ETHYL-4-METHYL PYRIMIDINE-5-CARBOXYLATE 110960-73-1 C8H10N2O2
2-(AMINOMETHYL)-3-CHLORO-5-(TRIFLUOROMETHYL)-PYRIDINE HYDROCHLORIDE 2-(AMINOMETHYL)-3-CHLORO-5-(TRIFLUOROMETHYL)-PYRIDINE HYDROCHLORIDE 175277-74-4 C7H6ClF3N2
N-(TETRAHYDRO-2H-PYRAN-2-YLOXY)SUCCINIMIDE N-(TETRAHYDRO-2H-PYRAN-2-YLOXY)SUCCINIMIDE 55610-40-7 C9H13NO4
3-CHLORO-2-HYDROXY-5-FORMYLPYRIDINE 3-CHLORO-2-HYDROXY-5-FORMYLPYRIDINE 627501-18-2 C6H4ClNO2
5-FLUORO-2-METHOXYISONICOTINIC ACID 5-FLUORO-2-METHOXYISONICOTINIC ACID 884495-30-1 C7H6FNO3
2-METHOXY-4-(TRIFLUOROMETHYL)PYRIDINE-5-CARBOXAMIDE 2-METHOXY-4-(TRIFLUOROMETHYL)PYRIDINE-5-CARBOXAMIDE 175204-87-2 C8H7F3N2O2
1-Pyrrolidineacetic acid, 3-hydroxy- (9CI) 1-Pyrrolidineacetic acid, 3-hydroxy- (9CI) 258530-57-3 C6H11NO3
4,4'-DIMETHOXY-2,2'-BIPYRIDINE 4,4'-DIMETHOXY-2,2'-BIPYRIDINE 17217-57-1 C12H12N2O2
6-IODO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 6-IODO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 849830-15-5 C7H6INO2
(6-CHLORO-PYRIDAZIN-3-YL)-DIMETHYL-AMINE (6-CHLORO-PYRIDAZIN-3-YL)-DIMETHYL-AMINE 7145-60-0 C6H8ClN3
6-Chloro-N-isopropylpyrimidin-4-amine 6-Chloro-N-isopropylpyrimidin-4-amine 945896-32-2 C7H10ClN3
5-Bromo-4-(3-methoxyphenyl)pyrimidine 5-Bromo-4-(3-methoxyphenyl)pyrimidine 941294-40-2 C11H9BrN2O
2,3-dichloro-5-fluoropyridine 2,3-dichloro-5-fluoropyridine 185985-40-4 C5H2Cl2FN
2-Bromo-3-iodopyridine 2-Bromo-3-iodopyridine 265981-13-3 C5H3BrIN
2-Cyano-5-methoxypyridine 2-Cyano-5-methoxypyridine 89809-63-2 C7H6N2O
4,6-DIAMINO-5-NITROPYRIMIDINE 4,6-DIAMINO-5-NITROPYRIMIDINE C4H5N5O2
4-CHLORO-6-HYDRAZINO-PYRIMIDIN-5-YLAMINE 4-CHLORO-6-HYDRAZINO-PYRIMIDIN-5-YLAMINE 42786-59-4 C4H6ClN5
5-P-TOLYLPYRIDIN-2-YLAMINE 5-P-TOLYLPYRIDIN-2-YLAMINE 503536-74-1 C12H12N2
2-(TETRAHYDRO-PYRAN-4-YL)-ETHANOL 2-(TETRAHYDRO-PYRAN-4-YL)-ETHANOL 4677-18-3 C7H14O2
ETHYL 3-BROMOIMIDAZO[1,2-A]PYRIMIDINE-2-CARBOXYLATE ETHYL 3-BROMOIMIDAZO[1,2-A]PYRIMIDINE-2-CARBOXYLATE 134044-63-6 C9H8BrN3O2
5-BROMOBENZO[B]THIOPHENE-3-CARBOXYLIC ACID 5-BROMOBENZO[B]THIOPHENE-3-CARBOXYLIC ACID 7312-24-5 C9H5BrO2S
5,6-DIHYDRO-4-HYDROXY-6-METHYL-2H-PYRAN-2-ONE 5,6-DIHYDRO-4-HYDROXY-6-METHYL-2H-PYRAN-2-ONE 33177-29-6 C6H8O3
5-methoxy-1-benzothiophene 5-methoxy-1-benzothiophene 20532-30-3 C9H8OS
5-BROMOBENZO[B]THIOPHENE-2-BORONIC ACID 5-BROMOBENZO[B]THIOPHENE-2-BORONIC ACID 884010-25-7 C8H6BBrO2S
5-BROMO-6-AMINOURACIL 5-BROMO-6-AMINOURACIL 6312-73-8 C4H4BrN3O2
(R)-2-AMINO-3-PYRIDIN-3-YL-PROPIONIC ACID METHYL ESTER 2 HCL (R)-2-AMINO-3-PYRIDIN-3-YL-PROPIONIC ACID METHYL ESTER 2 HCL 197088-84-9 C9H13ClN2O2
ISOQUINOLINE-4-CARBONITRILE ISOQUINOLINE-4-CARBONITRILE 34846-65-6 C10H6N2
Pyridine,3-hydrazinyl-,hydrochloride  (1:2) Pyridine,3-hydrazinyl-,hydrochloride (1:2) 364727-74-2 C5H8ClN3
4,5,6,7-Tetrahydro-3-hydroxy-[1,2,3]oxadiazolo[3,4-a]pyridin-8-ium inner salt 4,5,6,7-Tetrahydro-3-hydroxy-[1,2,3]oxadiazolo[3,4-a]pyridin-8-ium inner salt 105786-95-6 C6H8N2O2
Pyrimidinetetraamine/sulfuric acid,(1:x) Pyrimidinetetraamine/sulfuric acid,(1:x) 49647-58-7 C4H8N6.H2SO4
2-(PYRROLIDIN-1-YL)PYRIMIDINE-5-BORONIC ACID PINACOL ESTER 2-(PYRROLIDIN-1-YL)PYRIMIDINE-5-BORONIC ACID PINACOL ESTER 1015242-07-5 C14H22BN3O2
6-NITROPYRIDINE-2-CARBOXYLIC ACID 6-NITROPYRIDINE-2-CARBOXYLIC ACID 26893-68-5 C6H4N2O4
3-BROMOTHIOPHENE-2-CARBONITRILE 3-BROMOTHIOPHENE-2-CARBONITRILE 18791-98-5 C5H2BrNS
2-AMINO-4-METHOXYPYRIMIDINE 2-AMINO-4-METHOXYPYRIMIDINE C5H7N3O
6,7,8-TRIMETHOXYCOUMARIN 6,7,8-TRIMETHOXYCOUMARIN 6035-49-0 C12H12O5
4-Methoxy-6-trifluoromethyl-2-pyrimidinamine 4-Methoxy-6-trifluoromethyl-2-pyrimidinamine 16097-61-3 C6H6F3N3O
4-PYRIDAZINEMETHANAMINE 4-PYRIDAZINEMETHANAMINE 519020-42-9 C5H7N3
4-CHLOROPYRIDAZINE 4-CHLOROPYRIDAZINE 17180-92-6 C4H3ClN2
4,5-DICHLORO-6-METHYLPYRIMIDINE 4,5-DICHLORO-6-METHYLPYRIMIDINE 83942-10-3 C5H4Cl2N2
4-PHENOXY-6-CHLOROPYRIMIDINE 4-PHENOXY-6-CHLOROPYRIMIDINE 124041-00-5 C10H7ClN2O
2,3-DIHYDRO-3-OXO-4-PYRIDAZINECARBONITRILE 2,3-DIHYDRO-3-OXO-4-PYRIDAZINECARBONITRILE 64882-65-1 C5H3N3O
7-CHLOROISOQUINOLINE 7-CHLOROISOQUINOLINE 34784-06-0 C9H6ClN
2,3-Diamino-4-chloropyridine 2,3-Diamino-4-chloropyridine 24484-98-8 C5H6ClN3
4-BROMO-5-NITROTHIOPHENE-2-CARBOXALDEHYDE 4-BROMO-5-NITROTHIOPHENE-2-CARBOXALDEHYDE 41498-07-1 C5H2BrNO3S
5-(1H-Imidazol-1-yl)-2-pyridinamine 5-(1H-Imidazol-1-yl)-2-pyridinamine 935547-73-2 C8H8N4
3-AMINO-5-BROMO-2-METHOXYPYRIDINE 3-AMINO-5-BROMO-2-METHOXYPYRIDINE C6H7BrN2O
2-(Phenyl)-4-(3-hydroxy-4-chlorophenyl)-5-(4-pyridyl)-1H-imidazole 2-(Phenyl)-4-(3-hydroxy-4-chlorophenyl)-5-(4-pyridyl)-1H-imidazole 303727-31-3 C20H14ClN3O
Ethyl-5-bromopyrimidine-2-carboxylate Ethyl-5-bromopyrimidine-2-carboxylate 1197193-30-8 C7H7BrN2O2
3-(Chloromethyl)pyridazine 3-(Chloromethyl)pyridazine 41227-72-9 C5H5ClN2
6-Bromoimidazo[1,2-a]pyridine-3-carboxylicacid 6-Bromoimidazo[1,2-a]pyridine-3-carboxylicacid 944896-42-8 C8H5BrN2O2
2,6-Dichloro-3-methyl-5-nitropyridine 2,6-Dichloro-3-methyl-5-nitropyridine 58596-88-6 C6H4Cl2N2O2
1-(5-Fluoropyridin-2-yl)ethanone 1-(5-Fluoropyridin-2-yl)ethanone 915720-54-6 C7H6FNO
5-Bromo-2-(1-hydroxy-1-methylethyl)pyridine 5-Bromo-2-(1-hydroxy-1-methylethyl)pyridine 290307-40-3 C8H10BrNO
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