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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
4-Pyrimidinol, 2,6-diamino- (9CI) 4-Pyrimidinol, 2,6-diamino- (9CI) 100643-27-4 C4H6N4O
6-Amino-2-methylthio-3-methyluracil 6-Amino-2-methylthio-3-methyluracil 54030-56-7 C6H9N3OS
1H-Pyrrolo[2,3-c]pyridin-5-amine(9CI) 1H-Pyrrolo[2,3-c]pyridin-5-amine(9CI) 174610-12-9 C7H7N3
1-Benzyl-4-(3-nitropyridin-2-yl)piperazine 1-Benzyl-4-(3-nitropyridin-2-yl)piperazine 499771-07-2 C16H18N4O2
6-CHLOROTHYMINE 6-CHLOROTHYMINE 1627-28-7 C5H5ClN2O2
2-Pyridinecarboxylicacid,4-amino-,ethylester(9CI) 2-Pyridinecarboxylicacid,4-amino-,ethylester(9CI) 773140-43-5 C8H10N2O2
3-Pyridinol,2,6-difluoro-(9CI) 3-Pyridinol,2,6-difluoro-(9CI) 209328-85-8 C5H3F2NO
4-Pyrimidinecarboxylicacid,2-methyl-,methylester(9CI) 4-Pyrimidinecarboxylicacid,2-methyl-,methylester(9CI) 73955-55-2 C7H8N2O2
1-(5-Bromopyridin-2-yl)-1H-pyrazole 1-(5-Bromopyridin-2-yl)-1H-pyrazole 433922-57-7 C8H6BrN3
5-Bromo-N-cyclopentylpicolinamide 5-Bromo-N-cyclopentylpicolinamide 845305-91-1 C11H13BrN2O
5-Bromo-N-propylpicolinamide 5-Bromo-N-propylpicolinamide 845305-89-7 C9H11BrN2O
1H-Pyrrolo[3,2-b]pyridine,7-methoxy-(9CI) 1H-Pyrrolo[3,2-b]pyridine,7-methoxy-(9CI) 425380-39-8 C8H8N2O
3-Pyridinecarbonitrile,6-methoxy-2-methyl-(9CI) 3-Pyridinecarbonitrile,6-methoxy-2-methyl-(9CI) 105277-11-0 C8H8N2O
3-Pyridineacetonitrile,2-methyl-(6CI,9CI) 3-Pyridineacetonitrile,2-methyl-(6CI,9CI) 101166-73-8 C8H8N2
4-Quinolinol,6-amino-(9CI) 4-Quinolinol,6-amino-(9CI) 56717-02-3 C9H8N2O
5-Bromo-2-iodo-4-picoline 5-Bromo-2-iodo-4-picoline 941294-57-1 C6H5BrIN
5-ETHYL-4,5,6,7-TETRAHYDRO-THIAZOLO[5,4-C]PYRIDIN-2-YLAMINE 5-ETHYL-4,5,6,7-TETRAHYDRO-THIAZOLO[5,4-C]PYRIDIN-2-YLAMINE 17899-49-9 C8H13N3S
4-IODO-2-PYRIDONE 4-IODO-2-PYRIDONE 858839-90-4 C5H4INO
Methyl 1-(4-fluorophenyl)-6-oxo-1,6-dihydropyridine-3-carboxylate Methyl 1-(4-fluorophenyl)-6-oxo-1,6-dihydropyridine-3-carboxylate 929000-81-7 C13H10FNO3
2-Hydrazinyl-5-methyl-3-nitropyridine 2-Hydrazinyl-5-methyl-3-nitropyridine 21901-25-7 C6H8N4O2
Ethyl 6-methylimidazo[1,2-a]pyridine-2-carboxylate Ethyl 6-methylimidazo[1,2-a]pyridine-2-carboxylate 70705-30-5 C11H12N2O2
2-Chloro-4-hydrazino-5-methoxy-pyrimidine 2-Chloro-4-hydrazino-5-methoxy-pyrimidine 98021-95-5 C5H7ClN4O
4,6-DICHLORO-2-METHOXYMETHYLPYRIMIDINE 4,6-DICHLORO-2-METHOXYMETHYLPYRIMIDINE 1903-92-0 C6H6Cl2N2O
4,4'-Dipyridyl hydrate 4,4'-Dipyridyl hydrate 123333-55-1 C10H10N2O
(S)-2-[4-(1,1-Dimethylethyl)-4,5-dihydro-2-oxazolyl]-6-methylpyridine (S)-2-[4-(1,1-Dimethylethyl)-4,5-dihydro-2-oxazolyl]-6-methylpyridine 199277-80-0 C13H18N2O
Ethyl 2-hydroxy-6-methylpyridine-4-carboxylate, 97% Ethyl 2-hydroxy-6-methylpyridine-4-carboxylate, 97% 150190-03-7 C9H11NO3
2-MORPHOLIN-4-YL-PYRIMIDINE-5-CARBALDEHYDE 2-MORPHOLIN-4-YL-PYRIMIDINE-5-CARBALDEHYDE C9H11N3O2
2-BROMOPYRIDINE-4-CARBOXALDEHYDE DIETHYL ACETAL 2-BROMOPYRIDINE-4-CARBOXALDEHYDE DIETHYL ACETAL C10H14BrNO2
posizolid posizolid 252260-02-9 C21H21F2N3O7
1H-Pyrrolo[2,3-b]pyridine, 4-chloro-1-[tris(1-methylethyl)silyl]- 1H-Pyrrolo[2,3-b]pyridine, 4-chloro-1-[tris(1-methylethyl)silyl]- 651744-48-8 C16H25ClN2Si
(6-CHLOROPYRIDAZIN-3-YL)(PHENYL)METHANONE (6-CHLOROPYRIDAZIN-3-YL)(PHENYL)METHANONE 146233-32-1 C11H7ClN2O
DIETHYL 4-ETHYL-1,4-DIHYDRO-2,6-DIMETHYL-3,5-PYRIDINEDICARBOXYLATE DIETHYL 4-ETHYL-1,4-DIHYDRO-2,6-DIMETHYL-3,5-PYRIDINEDICARBOXYLATE 1153-66-8 C15H23NO4
1-(3-CHLORO-PYRIDIN-4-YL)-ETHANONE 1-(3-CHLORO-PYRIDIN-4-YL)-ETHANONE 78790-82-6 C7H6ClNO
5-BROMO-2-PYRIMIDINEACETONITRILE 5-BROMO-2-PYRIMIDINEACETONITRILE 831203-15-7 C6H4BrN3
3,5-DIBROMO-4-CHLOROPYRIDINE 3,5-DIBROMO-4-CHLOROPYRIDINE 13626-17-0 C5H2Br2ClN
ETHYL 3-HYDROXYFURO[2,3-C]PYRIDINE-2-CARBOXYLATE ETHYL 3-HYDROXYFURO[2,3-C]PYRIDINE-2-CARBOXYLATE 106531-50-4 C10H9NO4
3-Chloro-6-phenyl-pyridazin-4-ol 3-Chloro-6-phenyl-pyridazin-4-ol 89868-13-3 C10H7ClN2O
(R)-6-Cyclopentyl-6-[2-(2,6-diethylpyridin-4-yl)ethyl]-3-[(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)methyl]-4-hydroxy-5,6-dihydro-2H-pyran-2-one (R)-6-Cyclopentyl-6-[2-(2,6-diethylpyridin-4-yl)ethyl]-3-[(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)methyl]-4-hydroxy-5,6-dihydro-2H-pyran-2-one 877130-28-4 C29H37N5O3
N-Methyl-N-[2-(4-nitrophenoxy)ethyl]-2-pyridinamine N-Methyl-N-[2-(4-nitrophenoxy)ethyl]-2-pyridinamine 329249-47-0 C14H15N3O3
2,4-Dichloro-5-fluoropyridine 2,4-Dichloro-5-fluoropyridine 189281-48-9 C5H2Cl2FN
3-Chloro-6-(4-piperidyloxy)pyridazine 3-Chloro-6-(4-piperidyloxy)pyridazine 1185536-63-3 C9H12ClN3O
2,5-dibromonicotinonitrile 2,5-dibromonicotinonitrile 1214340-41-6 C6H2Br2N2
methyl 2-amino-5-tert-butylthiophene-3-carboxylate methyl 2-amino-5-tert-butylthiophene-3-carboxylate 216574-71-9 C10H15NO2S
(R)-3-(1-(2,6-dichloro-3-fluorophenyl)ethoxy)-2-nitropyridine (R)-3-(1-(2,6-dichloro-3-fluorophenyl)ethoxy)-2-nitropyridine 877397-70-1 C13H9Cl2FN2O3
(5-Chloro-pyrimidin-2-yl)-cyclopropyl-amine (5-Chloro-pyrimidin-2-yl)-cyclopropyl-amine 1289385-19-8 C7H8ClN3
(2-Chloro-6-methyl-pyrimidin-4-yl)-ethyl-amine (2-Chloro-6-methyl-pyrimidin-4-yl)-ethyl-amine 502141-81-3 C7H10ClN3
2,4-Dichloro-5-ethoxymethyl-pyrimidine 2,4-Dichloro-5-ethoxymethyl-pyrimidine 7627-39-6 C7H8Cl2N2O
2-(Chloromethyl)-3-fluoropyridine Hydrochloride 2-(Chloromethyl)-3-fluoropyridine Hydrochloride 149463-07-0 C6H6Cl2FN
Pyrido[3,2-d]pyriMidin-4 (1H)-one, 2-aMino-6-chloro- Pyrido[3,2-d]pyriMidin-4 (1H)-one, 2-aMino-6-chloro- 897359-74-9 C7H5ClN4O
2-NITROPYRIDINE 2-NITROPYRIDINE 1232169-16-2 C5H4N2O2
2-broMopyriMidin-4-aMine 2-broMopyriMidin-4-aMine 1160994-71-7 C4H4BrN3
4-Iododibenzothiophene 4-Iododibenzothiophene 132034-89-0 C12H7IS
METHYL 4-CYANO-5-(METHYLTHIO)THIOPHENE-2-CARBOXYLATE METHYL 4-CYANO-5-(METHYLTHIO)THIOPHENE-2-CARBOXYLATE 175202-48-9 C8H7NO2S2
3-(AMINOMETHYL)-6-(TRIFLUOROMETHYL)PYRIDINE 3-(AMINOMETHYL)-6-(TRIFLUOROMETHYL)PYRIDINE 388565-75-1 C12H13N3O2S
4-NITRO-3-PYRIDINECARBOXYLIC ACID 4-NITRO-3-PYRIDINECARBOXYLIC ACID 100367-58-6 C6H4N2O4
5-FLUORO-4-(CARBOXYMETHYLTHIO)URACIL 5-FLUORO-4-(CARBOXYMETHYLTHIO)URACIL 654-92-2 C6H5FN2O3S
2-AMINO-6-PYRIDINE CARBOXALDEHYDE 2-AMINO-6-PYRIDINE CARBOXALDEHYDE 332884-35-2 C6H6N2O
2,6-Dichloroisonicotinamide 2,6-Dichloroisonicotinamide 89281-13-0 C6H4Cl2N2O
Ethyl 2-hydroxy-4-methyl-5-pyrimidinecarboxylate Ethyl 2-hydroxy-4-methyl-5-pyrimidinecarboxylate 6214-64-8 C8H10N2O3
3-BROMO-2-HYDRAZINO-5-NITROPYRIDINE 3-BROMO-2-HYDRAZINO-5-NITROPYRIDINE 15862-38-1 C5H5BrN4O2
1-(3-AMINO-2,6-DICHLOROPYRIDIN-4-YL)ETHANONE 1-(3-AMINO-2,6-DICHLOROPYRIDIN-4-YL)ETHANONE 912772-91-9 C7H6Cl2N2O
2-TERT-BUTYLISONICOTINONITRILE 2-TERT-BUTYLISONICOTINONITRILE 33538-09-9 C10H12N2
2,4-DIBROMOPYRIMIDINE 2,4-DIBROMOPYRIMIDINE C4H2Br2N2
TRIFLUOROACETYLPIPERAZINE TRIFLUOROACETYLPIPERAZINE C6H9F3N2O
2-(TERT-BUTYL)-4,5-DICHLORO-2,3-DIHYDROPYRIDAZIN-3-ONE 2-(TERT-BUTYL)-4,5-DICHLORO-2,3-DIHYDROPYRIDAZIN-3-ONE 84956-71-8 C8H10Cl2N2O
2-CHLOROPYRIDO[2,3-D]PYRIMIDIN-4(1H)-ONE HYDROCHLORIDE 2-CHLOROPYRIDO[2,3-D]PYRIMIDIN-4(1H)-ONE HYDROCHLORIDE 126728-21-0 C7H5Cl2N3O
3-Hydroxybenzothiophene 3-Hydroxybenzothiophene 520-72-9 C8H6OS
3-AMINO-2-(2-FLUOROPHENOXY)PYRIDINE 3-AMINO-2-(2-FLUOROPHENOXY)PYRIDINE 175135-66-7 C11H9FN2O
6-CHLORO-1,3-DIHYDRO-2H-IMIDAZO[4,5-B]PYRIDIN-2-ONE 6-CHLORO-1,3-DIHYDRO-2H-IMIDAZO[4,5-B]PYRIDIN-2-ONE 304861-88-9 C6H4ClN3O
2,3-DIAMINO-5-BROMO-6-METHYLPYRIDINE 2,3-DIAMINO-5-BROMO-6-METHYLPYRIDINE 59352-90-8 C6H8BrN3
2-BROMO-1-[5-(2-PYRIDINYL)-2-THIENYL]-1-ETHANONE 2-BROMO-1-[5-(2-PYRIDINYL)-2-THIENYL]-1-ETHANONE 306935-06-8 C11H8BrNOS
Inabenfide Inabenfide 82211-24-3 C19H15ClN2O2
2-BENZYLOXY-NICOTINIC ACID 2-BENZYLOXY-NICOTINIC ACID C13H11NO3
3-(2-AMINOETHYL)PYRIDINE DIHYDROBROMIDE& 3-(2-AMINOETHYL)PYRIDINE DIHYDROBROMIDE& 307496-23-7 C7H11BrN2
METHYL 4-CHLOROPYRIDIN-2-YLCARBAMATE 97 METHYL 4-CHLOROPYRIDIN-2-YLCARBAMATE 97 889676-38-4 C7H7ClN2O2
NEURODYE RH-795, PURE NEURODYE RH-795, PURE 336185-18-3 C28H42N3O4+
7-Chloro-4-iodoquinoline 7-Chloro-4-iodoquinoline 98591-57-2 C9H5ClIN
6-CHLORO-5-METHYLPYRIDIN-3-AMINE 6-CHLORO-5-METHYLPYRIDIN-3-AMINE C6H7ClN2
2,4,5,6-TETRAMINOPYRIMIDINE SULFATE 2,4,5,6-TETRAMINOPYRIMIDINE SULFATE C4H10N6O4S
4-METHYL-2-METHYLSULFANYL-PYRIMIDINE-5-CARBOXYLIC ACID ETHYL ESTER 4-METHYL-2-METHYLSULFANYL-PYRIMIDINE-5-CARBOXYLIC ACID ETHYL ESTER 7234-25-5 C9H12N2O2S
2,3-CYCLOHEPTENOPYRIDINE 2,3-CYCLOHEPTENOPYRIDINE 7197-96-8 C10H13N
2-(BROMOMETHYL)TETRAHYDRO-2 H-PYRAN 2-(BROMOMETHYL)TETRAHYDRO-2 H-PYRAN 34723-82-5 C6H11BrO
4-BENZYLOXY-6-CHLOROPYRIMIDINE 4-BENZYLOXY-6-CHLOROPYRIMIDINE 405930-65-6 C11H9ClN2O
4-AMINO-2-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLIC ACID 4-AMINO-2-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLIC ACID C6H4F3N3O2
2-PHENYL-NICOTINIC ACID METHYL ESTER 2-PHENYL-NICOTINIC ACID METHYL ESTER 188797-88-8 C13H11NO2
2-FLUORO-4-PYRIDINEMETHANOL 2-FLUORO-4-PYRIDINEMETHANOL 131747-60-9 C6H6FNO
2,4-BIS-(BENZYLOXY)-5-(5,5-DIMETHYL-[1,3,2]-DIOXABORINAN-2-YL)PYRIMIDINE 2,4-BIS-(BENZYLOXY)-5-(5,5-DIMETHYL-[1,3,2]-DIOXABORINAN-2-YL)PYRIMIDINE 1072944-91-2 C23H25BN2O4
3-NITRO-IMIDAZO[1,2-A]PYRIMIDINE 3-NITRO-IMIDAZO[1,2-A]PYRIMIDINE 798568-24-8 C6H4N4O2
2-CHLORO-3-IODO-5-(TRIFLUOROMETHYL)PYRIDINE 2-CHLORO-3-IODO-5-(TRIFLUOROMETHYL)PYRIDINE 505084-56-0 C6H2ClF3IN
5-BROMO-3-FLUORO-2-HYDROXYPYRIDINE 5-BROMO-3-FLUORO-2-HYDROXYPYRIDINE C5H3BrFNO
3-Pyridazinamine, 6-[(3-methoxyphenyl)methyl]- 3-Pyridazinamine, 6-[(3-methoxyphenyl)methyl]- 874338-91-7 C12H13N3O
3,4,5-Trichloro-6-hydroxypyridine-2-carboxylic acid 3,4,5-Trichloro-6-hydroxypyridine-2-carboxylic acid 73455-14-8 C6H2Cl3NO3
pyridin-4-aMine hydrochloride pyridin-4-aMine hydrochloride 1003-40-3 C14H25NO4
4-(2,3-DICHLORO-PHENYL)-2,6-DIMETHYL-1,4-DIHYDRO-PYRIDINE-3,5-DICARBOXYLIC ACID MONOMETHYL ESTER 4-(2,3-DICHLORO-PHENYL)-2,6-DIMETHYL-1,4-DIHYDRO-PYRIDINE-3,5-DICARBOXYLIC ACID MONOMETHYL ESTER 105580-45-8 C16H15Cl2NO4
3-Iodo-5-Hydroxypyridine 3-Iodo-5-Hydroxypyridine 213765-61-8 C5H4INO
2,4-DIIODOPYRIDINE 2,4-DIIODOPYRIDINE 83674-71-9 C5H3I2N
Boronic acid, (1-methyl-4-piperidinyl)- (9CI) Boronic acid, (1-methyl-4-piperidinyl)- (9CI) 706748-53-0 C6H14BNO2
Furo[2,3-c]pyridin-3(2H)-one (9CI) Furo[2,3-c]pyridin-3(2H)-one (9CI) 106531-52-6 C7H5NO2
2,3-DIFLUORO-5-NITROPYRIDINE 2,3-DIFLUORO-5-NITROPYRIDINE C5H2F2N2O2
4(1H)-Pyrimidinone, 5-fluoro-6-hydroxy-2-methyl- (9CI) 4(1H)-Pyrimidinone, 5-fluoro-6-hydroxy-2-methyl- (9CI) 1598-63-6 C5H5FN2O2
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