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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-Pyrimidinamine, 4-cyclopropyl- (9CI) 2-Pyrimidinamine, 4-cyclopropyl- (9CI) 21573-15-9 C7H9N3
2-cyclopropylpyrimidine-5-carbaldehyde 2-cyclopropylpyrimidine-5-carbaldehyde 954226-60-9 C8H8N2O
Pyrimidine, 5-nitro- (8CI,9CI) Pyrimidine, 5-nitro- (8CI,9CI) 14080-32-1 C4H3N3O2
Pyrimidine, 2-hydrazino-4-methoxy- (7CI) Pyrimidine, 2-hydrazino-4-methoxy- (7CI) 89181-80-6 C5H8N4O
Benzeneacetic acid, 3-(3-pyridinyl)- (9CI) Benzeneacetic acid, 3-(3-pyridinyl)- (9CI) 597584-62-8 C13H11NO2
5-Fluoroisoquinoline 5-Fluoroisoquinoline 394-66-1 C9H6FN
3-fluoro-2-cyanopyridine 3-fluoro-2-cyanopyridine C6H3FN2
3-Hydroxymetnylbenzo[b]thiophene 3-Hydroxymetnylbenzo[b]thiophene 5381-24-8 C9H8OS
2-tert-Butyl-4,5-dichloro-3-2H-pyridazinone 2-tert-Butyl-4,5-dichloro-3-2H-pyridazinone C8H10Cl2N2O
5-fluoro-3-methyl-1H-pyrimidine-2,4-dione 5-fluoro-3-methyl-1H-pyrimidine-2,4-dione 4840-69-1 C5H5FN2O2
5-Amino-2-methoxy-4-methylpyridine 5-Amino-2-methoxy-4-methylpyridine C7H10N2O
5-Bromo-3-nitro-2-(1H-pyrazol-1-yl)pyridine 98% 5-Bromo-3-nitro-2-(1H-pyrazol-1-yl)pyridine 98% 446284-40-8 C8H5BrN4O2
2-BROMO-3-NITRO-4-METHYL-5-FLUOROPYRIDINE 2-BROMO-3-NITRO-4-METHYL-5-FLUOROPYRIDINE C6H4BrFN2O2
4-Pyridinemethanamine,2-fluoro-(9CI) 4-Pyridinemethanamine,2-fluoro-(9CI) 777056-79-8 C6H7FN2
3-Pyridinethiol,4-amino-(6CI,9CI) 3-Pyridinethiol,4-amino-(6CI,9CI) 52334-54-0 C5H6N2S
1(6H)-Pyridazineaceticacid,6-oxo-(6CI,9CI) 1(6H)-Pyridazineaceticacid,6-oxo-(6CI,9CI) 95209-84-0 C6H6N2O3
2,7-Naphthyridine(7CI,8CI,9CI) 2,7-Naphthyridine(7CI,8CI,9CI) 253-45-2 C8H6N2
2-Fluoro-4-methylpyridine-5-carboxylic acid 2-Fluoro-4-methylpyridine-5-carboxylic acid 944582-95-0 C7H6FNO2
(R)-(+)-trans-4-(1-Aminoethyl)-N-(4-pyridyl)cyclohexanecarboxamide Dihydrochloride Monohydrate (R)-(+)-trans-4-(1-Aminoethyl)-N-(4-pyridyl)cyclohexanecarboxamide Dihydrochloride Monohydrate 331752-47-7 C14H25Cl2N3O2
2-Pyridinecarbonitrile,5-formyl-(9CI) 2-Pyridinecarbonitrile,5-formyl-(9CI) 131747-68-7 C7H4N2O
1H-Pyrrolo[2,3-c]pyridine,4-methoxy-(9CI) 1H-Pyrrolo[2,3-c]pyridine,4-methoxy-(9CI) 357263-40-2 C8H8N2O
1-(4-Pyridinylmethyl)-4-piperidinemethanol 1-(4-Pyridinylmethyl)-4-piperidinemethanol 914349-22-7 C12H18N2O
4-Pyridinethiol,3-amino-(9CI) 4-Pyridinethiol,3-amino-(9CI) 89002-13-1 C5H6N2S
2-Pyridinemethanol,4-amino-(6CI,9CI) 2-Pyridinemethanol,4-amino-(6CI,9CI) 100114-58-7 C6H8N2O
4-AMINO-4-CARBOXYTETRAHYDROTHIOPYRAN HYDROCHLORIDE 4-AMINO-4-CARBOXYTETRAHYDROTHIOPYRAN HYDROCHLORIDE 67639-41-2 C6H12ClNO2S
5-Benzyl-3-pyridinol 5-Benzyl-3-pyridinol 52196-90-4 C12H11NO
6-chloro-N-pentylpyridazin-3-amine 6-chloro-N-pentylpyridazin-3-amine 941294-42-4 C9H14ClN3
4-Chloro-6-(4-methyl-1H-imidazol-1-yl)pyrimidine 4-Chloro-6-(4-methyl-1H-imidazol-1-yl)pyrimidine 941294-32-2 C8H7ClN4
5-Bromo-4-(3,4-dimethylphenyl)pyrimidine 5-Bromo-4-(3,4-dimethylphenyl)pyrimidine 941294-38-8 C12H11BrN2
Ethyl 8-bromoimidazo[1,2-a]pyridine-6-carboxylate, HCl Ethyl 8-bromoimidazo[1,2-a]pyridine-6-carboxylate, HCl 957062-60-1 C10H10BrClN2O2
2-Ethyl-4,6-dihydroxypyrimidine 2-Ethyl-4,6-dihydroxypyrimidine C6H8N2O2
2-Thiophenesulfonic acid 2-Thiophenesulfonic acid 79-84-5 C4H4O3S2
1-Benzyl-4-(4-methylphenyl)tetrahydropyridine 1-Benzyl-4-(4-methylphenyl)tetrahydropyridine 13314-67-5 C19H21N
2,6-DICHLORO-4-ISOCYANATOPYRIDINE 2,6-DICHLORO-4-ISOCYANATOPYRIDINE 159178-03-7 C6H2Cl2N2O
5-BROMO-2-CHLOROPYRIDINE-3-BORONIC ACID, PINACOL ESTER 5-BROMO-2-CHLOROPYRIDINE-3-BORONIC ACID, PINACOL ESTER 1073354-79-6 C11H14BBrClNO2
2-MORPHOLINOPYRIMIDINE-5-CARBALDEHYDE 2-MORPHOLINOPYRIMIDINE-5-CARBALDEHYDE 842974-69-0 C9H11N3O2
2-(BOC-AMINO)-5-CYANOPYRIDINE 2-(BOC-AMINO)-5-CYANOPYRIDINE 902837-44-9 C11H13N3O2
(2-CHLORO-6-ISOPROPYLPYRIDIN-3-YL)BORONIC ACID (2-CHLORO-6-ISOPROPYLPYRIDIN-3-YL)BORONIC ACID 1003043-37-5 C8H11BClNO2
5-METHYL-6-DIMETHYLAMINOURACIL 5-METHYL-6-DIMETHYLAMINOURACIL 70629-11-7 C7H11N3O2
thiazolo[4,5-b]pyridin-2-amine thiazolo[4,5-b]pyridin-2-amine 13575-41-2 C6H5N3S
4-bromopyrazolo[3,4-d]pyrimidine 4-bromopyrazolo[3,4-d]pyrimidine 30129-51-2 C5H3BrN4
4-(4-CHLOROPHENYL)-1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 4-(4-CHLOROPHENYL)-1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 51304-61-1 C11H13Cl2N
2-HYDROXY-6-PHENYLPYRIDINE-4-CARBOXYLIC ACID 2-HYDROXY-6-PHENYLPYRIDINE-4-CARBOXYLIC ACID 91493-43-5 C12H9NO3
3-THIOPHENAMINE, TETRAHYDRO- 3-THIOPHENAMINE, TETRAHYDRO- 101993-01-5 C4H9NS
ethyl 5-benzyl-4,5,6,7-tetrahydro-1H-pyrrolo[3,2-c]pyridine-2-carboxylate ethyl 5-benzyl-4,5,6,7-tetrahydro-1H-pyrrolo[3,2-c]pyridine-2-carboxylate 1201784-83-9 C17H20N2O2
6-Chloro-3-nitro-2-(trifluoromethyl)pyridine 6-Chloro-3-nitro-2-(trifluoromethyl)pyridine 117519-12-7 C6H2ClF3N2O2
6-Chloro-3-fluoro-2-(hydroxymethyl)pyridine 6-Chloro-3-fluoro-2-(hydroxymethyl)pyridine 884494-80-8 C6H5ClFNO
5-BROMO-2-ETHOXYPYRIDIN-3-YLBORONIC ACID 5-BROMO-2-ETHOXYPYRIDIN-3-YLBORONIC ACID 871332-98-8 C7H9BBrNO3
3-BROMO-2,5-DIAMINOPYRIDINE, 99% 3-BROMO-2,5-DIAMINOPYRIDINE, 99% 896160-69-3 C5H6BrN3
2-FLUORO-5-FORMYL-3-PICOLINE 2-FLUORO-5-FORMYL-3-PICOLINE 884495-04-9 C7H6FNO
5-BROMO-8-CHLOROISOQUINOLINE 5-BROMO-8-CHLOROISOQUINOLINE 956003-79-5 C9H5BrClN
2-Methylimidazo[1,2-b]pyridazine 2-Methylimidazo[1,2-b]pyridazine 17412-37-2 C7H7N3
2-Chloro-4-nitro-5-pyrimidinamine 2-Chloro-4-nitro-5-pyrimidinamine 618397-67-4 C4H3ClN4O2
2-(6-broMopyridin-2-yl)propan-2-ol 2-(6-broMopyridin-2-yl)propan-2-ol 638218-78-7 C8H10BrNO
4-AMINO-2-CHLOROTHIENO[3,2-D]PYRIMIDINE 4-AMINO-2-CHLOROTHIENO[3,2-D]PYRIMIDINE 16234-40-5 C6H4ClN3S
4,5,6,7-Tetrahydrothieno[3,2-c]pyridin-7-ol 4,5,6,7-Tetrahydrothieno[3,2-c]pyridin-7-ol 59038-45-8 C7H9NOS
2-AMINO-3-NITROPYRIDINE-5-BORONIC ACID 2-AMINO-3-NITROPYRIDINE-5-BORONIC ACID 1032758-80-7 C11H16BN3O4
tert-butyl 5-bromo-3-hydroxypyridin-2-ylcarbamate tert-butyl 5-bromo-3-hydroxypyridin-2-ylcarbamate 1207175-73-2 C10H13BrN2O3
5-Ethyl-2-methylpyridine borane 5-Ethyl-2-methylpyridine borane 1006873-58-0 C8H11N.BH3
3,4,6-Tribromopyridazine 3,4,6-Tribromopyridazine 55928-86-4 C4HBr3N2
3-Amino-6-trifluoromethyl-pyridin-2-ol 3-Amino-6-trifluoromethyl-pyridin-2-ol 944904-43-2 C6H5F3N2O
3-PHENYLISONICOTINIC ACID 3-PHENYLISONICOTINIC ACID 104096-15-3 C12H9NO2
5-[2-Ethoxy-5-(4-ethylpiperazin-1-ylsulfonyl)pyridin-3-yl]-3-ethyl-2-(2-methoxyethyl)-2,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one 5-[2-Ethoxy-5-(4-ethylpiperazin-1-ylsulfonyl)pyridin-3-yl]-3-ethyl-2-(2-methoxyethyl)-2,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one 334826-98-1 C23H33N7O5S
3-Chloro-6-chloromethylpyridazine 3-Chloro-6-chloromethylpyridazine 120276-59-7 C5H4Cl2N2
4-Amino-2-(3-pyridinyl)-5-pyrimidinecarboxylic acidethylester 4-Amino-2-(3-pyridinyl)-5-pyrimidinecarboxylic acidethylester 1053656-10-2 C12H12N4O2
4-Chloropyridine-2-carboxylic acid tert-butyl ester 4-Chloropyridine-2-carboxylic acid tert-butyl ester 15583-17-2 C9H14N2
Ethyl 3-Hydroxypyridazine-4-carboxylate Ethyl 3-Hydroxypyridazine-4-carboxylate 1445-55-2 C7H8N2O3
Ethyl 3-Chloropyridazine-4-carboxylate Ethyl 3-Chloropyridazine-4-carboxylate 1445-54-1 C7H7ClN2O2
5-fluoro-6-hydroxypyridin-3-ylboronic acid 5-fluoro-6-hydroxypyridin-3-ylboronic acid 1141886-36-3 C5H5BFNO3
2-Amino-2,3-dihydro-thiazolo[4,5-b]pyridin-5(6H)-one 2-Amino-2,3-dihydro-thiazolo[4,5-b]pyridin-5(6H)-one 13575-44-5 C6H5N3OS
5-Nitropyridine-2-carboxamide 5-Nitropyridine-2-carboxamide 59290-34-5 C6H5N3O3
3-chloro-6-(1-methyl-1H-pyrazol-4-yl)pyridazine 3-chloro-6-(1-methyl-1H-pyrazol-4-yl)pyridazine 943541-20-6 C8H7ClN4
4-Chloro-5-methyl-2-(methylsulfonyl)pyrimidine 4-Chloro-5-methyl-2-(methylsulfonyl)pyrimidine 325780-94-7 C6H7ClN2O2S
5-Pyrimidinemethanol, 2-chloro- 5-Pyrimidinemethanol, 2-chloro- 1046816-75-4 C5H5ClN2O
2,4-Dichloro-6-methoxymethyl-pyrimidine 2,4-Dichloro-6-methoxymethyl-pyrimidine 1037543-27-3 C6H6Cl2N2O
4-Hydroxy-5-chloro-2-methylthiopyrimidine 4-Hydroxy-5-chloro-2-methylthiopyrimidine 61044-94-8 C5H5ClN2OS
3-methoxy-4-nitropyridine 3-methoxy-4-nitropyridine 13505-07-2 C6H6N2O3
5,7-dichloro-3-isopropylpyrazolo[1,5-a]pyrimidine 5,7-dichloro-3-isopropylpyrazolo[1,5-a]pyrimidine 771510-32-8 C9H9Cl2N3
3-aMino-5-broMo-4-chloropyridine 3-aMino-5-broMo-4-chloropyridine 89283-92-1 C5H4BrClN2
5,7-Dichloro-1H-pyrazolo[4,3-d]pyriMidine 5,7-Dichloro-1H-pyrazolo[4,3-d]pyriMidine 1196157-42-2 C5H2Cl2N4
3-BroMo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine hydrochloride 3-BroMo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine hydrochloride 905273-36-1 C7H7BrN2
2,4-Dichloro-6-methyl-5-pyrimidinecarboxylic acid methyl ester 2,4-Dichloro-6-methyl-5-pyrimidinecarboxylic acid methyl ester 36745-93-4 C7H6Cl2N2O2
4-CYANOPYRIDINE-2-BORONIC ACID PINACOL ESTER 4-CYANOPYRIDINE-2-BORONIC ACID PINACOL ESTER 1256359-18-8 C12H15BN2O2
2-CHLORO-ISONICOTINIC ACID HYDRAZIDE 2-CHLORO-ISONICOTINIC ACID HYDRAZIDE 58481-04-2 C6H6ClN3O
2-METHYLAMINO-ISONICOTINIC ACID 2-METHYLAMINO-ISONICOTINIC ACID 876717-53-2 C7H8N2O2
2-OCTANOYLTHIOPHENE 2-OCTANOYLTHIOPHENE 30711-41-2 C12H18OS
2-AMINOPYRIDINE-3-SULFONIC ACID 2-AMINOPYRIDINE-3-SULFONIC ACID 16250-07-0 C5H6N2O3S
2-METHYLSULFANYL-4-PHENYLPYRIMIDINE 2-METHYLSULFANYL-4-PHENYLPYRIMIDINE 56734-10-2 C11H10N2S
2-AMINO-4,5-DIMETHYL-THIOPHENE-3-CARBOXYLIC ACID METHYL ESTER 2-AMINO-4,5-DIMETHYL-THIOPHENE-3-CARBOXYLIC ACID METHYL ESTER 4651-93-8 C8H11NO2S
5-BROMO-N3-METHYL-PYRAZINE-2,3-DIAMINE 5-BROMO-N3-METHYL-PYRAZINE-2,3-DIAMINE 55635-63-7 C5H7BrN4
2,5-DIBROMOPYRIDINE-3-BORONIC ACID 2,5-DIBROMOPYRIDINE-3-BORONIC ACID 852228-14-9 C5H4BBr2NO2
2-METHYL-5-NITRO-PYRIMIDINE-4,6-DIOL 2-METHYL-5-NITRO-PYRIMIDINE-4,6-DIOL 53925-27-2 C5H5N3O4
1-(5-CHLORO-PYRIDIN-2-YL)-PIPERAZINE 1-(5-CHLORO-PYRIDIN-2-YL)-PIPERAZINE 87394-65-8 C9H12ClN3
4-METHOXYPYRIDINE-N-OXIDE HYDRATE, 99 4-METHOXYPYRIDINE-N-OXIDE HYDRATE, 99 207511-18-0 C6H9NO3
6-(4-FLUOROPHENOXY)PYRIDINE-3-AMINE, 97+% 6-(4-FLUOROPHENOXY)PYRIDINE-3-AMINE, 97+% 143071-78-7 C11H9FN2O
2,4-DIAMINOPYRIMIDINE-5-CARBOXYLIC ACID 2,4-DIAMINOPYRIMIDINE-5-CARBOXYLIC ACID 18588-61-9 C5H6N4O2
2-AMINO-4,6-DIMETHYL-5-IODOPYRIDINE 2-AMINO-4,6-DIMETHYL-5-IODOPYRIDINE 885952-12-5 C7H9IN2
5-FLUORO-4-HYDROXY-2-METHOXYPYRIMIDINE 5-FLUORO-4-HYDROXY-2-METHOXYPYRIMIDINE C5H5FN2O2
6-ETHYL-3-FORMYLCHROMONE 6-ETHYL-3-FORMYLCHROMONE 42059-78-9 C12H10O3
5-HYDROXYPYRIDINE-2-SULFONIC ACID 5-HYDROXYPYRIDINE-2-SULFONIC ACID 139263-48-2 C5H5NO4S
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