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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
4,6-DIAMINOPYRIMIDINE HEMISULFATE, MONOHYDRATE, 98 4,6-DIAMINOPYRIMIDINE HEMISULFATE, MONOHYDRATE, 98 77709-02-5 C4H8N4O4S
2-PHENYLPYRIMIDIN-5-AMINE 2-PHENYLPYRIMIDIN-5-AMINE 59808-52-5 C10H9N3
4-IODO-2-METHOXYPYRIDINE 4-IODO-2-METHOXYPYRIDINE C6H6INO
3,5-DINITROISONICOTINIC ACID 3,5-DINITROISONICOTINIC ACID 191017-95-5 C6H3N3O6
2,3-DIPHENYLPYRAZINE 2,3-DIPHENYLPYRAZINE 1588-89-2 C16H12N2
6-METHYLBENZOTHIOPHENE 6-METHYLBENZOTHIOPHENE 16587-47-6 C9H8S
4-ACETAMIDO-3-NITROPYRIDINE 4-ACETAMIDO-3-NITROPYRIDINE 79371-42-9 C7H7N3O3
3,4-DINITROPYRIDINE 3,4-DINITROPYRIDINE 14916-69-9 C5H3N3O4
ASISCHEM C63549 ASISCHEM C63549 335030-80-3 C7H7N3O2
3-METHOXY-2-PYRIDINECARBOXYLIC ACID 3-METHOXY-2-PYRIDINECARBOXYLIC ACID 16478-52-7 C7H7NO3
2-TRIFLUOROMETHYL-3-CYANOPYRIDINE 2-TRIFLUOROMETHYL-3-CYANOPYRIDINE 870066-15-2 C7H3F3N2
2-amino-4,6-bis(difluoromethoxy)pyrimidine 2-amino-4,6-bis(difluoromethoxy)pyrimidine 86209-44-4 C6H5F4N3O2
5-BROMO-2-CHLORO-4-(1-PYRROLIDINYL)PYRIMIDINE 5-BROMO-2-CHLORO-4-(1-PYRROLIDINYL)PYRIMIDINE 57054-90-7 C8H9BrClN3
2-(Dimethylamino)pyrimidine-4-carboxaldehyde 2-(Dimethylamino)pyrimidine-4-carboxaldehyde 872707-78-3 C7H9N3O
3-Amino-6-(propylthio)pyridazine 3-Amino-6-(propylthio)pyridazine 113121-36-1 C7H11N3S
2-Hydroxy-5-methylpyrimidine 2-Hydroxy-5-methylpyrimidine 41398-85-0 C5H6N2O
5-Iodopyridine-2-carboxylic acid 5-Iodopyridine-2-carboxylic acid 32046-43-8 C6H4INO2
3-Chloro-2-mercapto-5-nitropyridine 3-Chloro-2-mercapto-5-nitropyridine 64007-60-9 C5H3ClN2O2S
4-CHLORO-5-METHOXY-2-(METHYLSULFANYL)PYRIMIDINE 4-CHLORO-5-METHOXY-2-(METHYLSULFANYL)PYRIMIDINE 87026-45-7 C6H7ClN2OS
2,5-DIBROMOPYRIDINE-3-BORONIC ACID PINACOL ESTER 2,5-DIBROMOPYRIDINE-3-BORONIC ACID PINACOL ESTER 852228-17-2 C11H14BBr2NO2
4-CYANO-2-IODOPYRIDINE 4-CYANO-2-IODOPYRIDINE 114821-24-8 C6H3IN2
6-FLUOROPYRIDO[3,4-D]PYRIMIDIN-4-OL 6-FLUOROPYRIDO[3,4-D]PYRIMIDIN-4-OL 171178-44-2 C7H4FN3O
3-BROMO-5-(METHYLTHIO)PYRIDINE 3-BROMO-5-(METHYLTHIO)PYRIDINE 142137-18-6 C6H6BrNS
7-CHLORO-BENZO[B]THIOPHENE 7-CHLORO-BENZO[B]THIOPHENE 90407-14-0 C8H5ClS
(4-METHYLPYRIDIN-3-YL)METHANOL (4-METHYLPYRIDIN-3-YL)METHANOL 4664-27-1 C7H9NO
2-Amino-3,5-dinitro-6-methylpyridine 2-Amino-3,5-dinitro-6-methylpyridine 25864-34-0 C6H6N4O4
3-Methyl-4-nitropyridine-2-carboxylic acid 3-Methyl-4-nitropyridine-2-carboxylic acid 30235-17-7 C7H6N2O4
Pyridine, 2-(1-chloroethyl)- (7CI,8CI,9CI) Pyridine, 2-(1-chloroethyl)- (7CI,8CI,9CI) 10445-92-8 C7H8ClN
Isoquinoline, 5-(bromomethyl)- (9CI) Isoquinoline, 5-(bromomethyl)- (9CI) 158654-74-1 C10H8BrN
Pyrimidine, 5-fluoro-2-methoxy- (8CI,9CI) Pyrimidine, 5-fluoro-2-methoxy- (8CI,9CI) 17148-49-1 C5H5FN2O
2,6-Dimethyl-3-bromopyridine 2,6-Dimethyl-3-bromopyridine C7H8BrN
4(1H)-Pyrimidinone, 2-ethoxy- (7CI,9CI) 4(1H)-Pyrimidinone, 2-ethoxy- (7CI,9CI) 25957-58-8 C6H8N2O2
4(1H)-Pyrimidinone, 6-hydroxy-5-methyl- (8CI,9CI) 4(1H)-Pyrimidinone, 6-hydroxy-5-methyl- (8CI,9CI) 18337-63-8 C5H6N2O2
4-Pyrimidinamine, 5-(bromomethyl)-2-methyl- (9CI) 4-Pyrimidinamine, 5-(bromomethyl)-2-methyl- (9CI) 25526-81-2 C6H8BrN3
4-Pyrimidinecarboxaldehyde, 2-amino- (9CI) 4-Pyrimidinecarboxaldehyde, 2-amino- (9CI) 165807-06-7 C5H5N3O
5-Pyrimidinecarboxylic acid, 2-(4-pyridinyl)- (9CI) 5-Pyrimidinecarboxylic acid, 2-(4-pyridinyl)- (9CI) 259807-47-1 C10H7N3O2
5-Pyrimidinecarboxylic acid, 2-cyclopropyl- (9CI) 5-Pyrimidinecarboxylic acid, 2-cyclopropyl- (9CI) 648423-79-4 C8H8N2O2
5-Pyrimidinepropanamine (9CI) 5-Pyrimidinepropanamine (9CI) 112104-02-6 C7H11N3
5-FLUORO-1,3-DIMETHYLURACIL 5-FLUORO-1,3-DIMETHYLURACIL 3013-92-1 C6H7FN2O2
4-CHLORO-N,N-DIETHYL-PYRIDINE-2-CARBOXAMIDE 4-CHLORO-N,N-DIETHYL-PYRIDINE-2-CARBOXAMIDE 851903-41-8 C10H13ClN2O
[[[[(2S,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxola n-2-yl]amino]oxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]oxyphosphon ic acid [[[[(2S,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxola n-2-yl]amino]oxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]oxyphosphon ic acid 2226-74-6 C8H15N4O14P3
2-Pyridinecarboxamide,3,5-difluoro-(9CI) 2-Pyridinecarboxamide,3,5-difluoro-(9CI) 745784-03-6 C6H4F2N2O
5-Isoquinolinamine,7-chloro-(9CI) 5-Isoquinolinamine,7-chloro-(9CI) 608515-70-4 C9H7ClN2
1H-Pyrrolo[3,2-b]pyridine-5-methanamine(9CI) 1H-Pyrrolo[3,2-b]pyridine-5-methanamine(9CI) 267876-26-6 C8H9N3
4,5-Pyridazinediamine(9CI) 4,5-Pyridazinediamine(9CI) 28682-70-4 C4H6N4
6-SULFOPICOLINIC ACID 6-SULFOPICOLINIC ACID 18616-02-9 C6H5NO5S
6-AMINO-5-BROMO-2-(ETHYLTHIO)PYRIMIDIN-4-OL 6-AMINO-5-BROMO-2-(ETHYLTHIO)PYRIMIDIN-4-OL 77708-90-8 C6H8BrN3OS
1-(4-Bromophenyl)-2-oxo-1,2-dihydropyridine-3-carbonitrile 1-(4-Bromophenyl)-2-oxo-1,2-dihydropyridine-3-carbonitrile 929000-84-0 C12H7BrN2O
5-Bromo-4-ethylpyrimidine 5-Bromo-4-ethylpyrimidine 951884-36-9 C6H7BrN2
6-Chloroimidazo[1,2-b]pyridazine, HCl 6-Chloroimidazo[1,2-b]pyridazine, HCl 13493-79-3 C6H5Cl2N3
4H-Pyrido[1,2-a]pyrimidin-4-one, 9-bromo-2-hydroxy-7-methyl- 4H-Pyrido[1,2-a]pyrimidin-4-one, 9-bromo-2-hydroxy-7-methyl- 663619-90-7 C9H7BrN2O2
1-(3-CHLORO-2-PYRIDYL)HOMOPIPERAZINE 1-(3-CHLORO-2-PYRIDYL)HOMOPIPERAZINE 902837-06-3 C10H14ClN3
4-(6-Chloro-pyrimidin-4-yl)-piperazine-1-carboxylic acid tert-butyl ester 4-(6-Chloro-pyrimidin-4-yl)-piperazine-1-carboxylic acid tert-butyl ester 203519-88-4 C13H19ClN4O2
2-BROMO-6-CHLORO-IMIDAZO[1,2-B]PYRIDAZINE 2-BROMO-6-CHLORO-IMIDAZO[1,2-B]PYRIDAZINE 944902-75-4 C6H3BrClN3
2-Bromo-5-chloropyridine-4-carboxaldehyde 2-Bromo-5-chloropyridine-4-carboxaldehyde 921630-14-0 C6H3BrClNO
N-ETHYL-3-METHOXYPYRIDIN-2-AMINE N-ETHYL-3-METHOXYPYRIDIN-2-AMINE 912761-77-4 C8H12N2O
ethyl 1-((pyridin-4-yl)methyl) piperidine-4-carboxylate ethyl 1-((pyridin-4-yl)methyl) piperidine-4-carboxylate 138030-54-3 C14H20N2O2
6-(Benzyl-methylamino)pyridine-3-boronic acid pinacol ester 6-(Benzyl-methylamino)pyridine-3-boronic acid pinacol ester 1073354-30-9 C19H25BN2O2
5-(3-CHLOROPHENYL)-2-PYRIDINAMINE 5-(3-CHLOROPHENYL)-2-PYRIDINAMINE 893738-14-2 C11H9ClN2
1-(3-CHLORO-PYRIDIN-2-YL)-[1,4]DIAZEPANE 1-(3-CHLORO-PYRIDIN-2-YL)-[1,4]DIAZEPANE C10H14ClN3
2-Methyl-4-trifluoromethyl-pyrimidine-5-carboxylic acid 2-Methyl-4-trifluoromethyl-pyrimidine-5-carboxylic acid 149771-24-4 C7H5F3N2O2
PYRIDAZINE-3,6-DIOL PYRIDAZINE-3,6-DIOL C4H4N2O2
7-benzyl-4-chloro-2-(methylthio)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine 7-benzyl-4-chloro-2-(methylthio)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine 859826-11-2 C15H16ClN3S
5-Nitrobenzothiophene 5-Nitrobenzothiophene 4965-26-8 C8H5NO2S
6-Methyl-3H-thieno[2,3-d]pyrimidin-4-one ,97% 6-Methyl-3H-thieno[2,3-d]pyrimidin-4-one ,97% C7H6N2OS
6,7-dimethoxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline 6,7-dimethoxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline 4118-36-9 C17H19NO2
(2-PYRROLIDIN-1-YLPYRID-4-YL)METHYLAMINE (2-PYRROLIDIN-1-YLPYRID-4-YL)METHYLAMINE 876316-38-0 C10H15N3
3-(CYANOMETHYL)-5-METHOXY-1H-PYRROLO[2,3-C]PYRIDINE-2-CARBOXYLIC ACID 3-(CYANOMETHYL)-5-METHOXY-1H-PYRROLO[2,3-C]PYRIDINE-2-CARBOXYLIC ACID 22772-37-8 C11H9N3O3
(5-CYANO-PYRIDIN-2-YL)-CARBAMIC ACID TERT-BUTYL ESTER (5-CYANO-PYRIDIN-2-YL)-CARBAMIC ACID TERT-BUTYL ESTER C11H13N3O2
6-BROMO-2-PYRIDINEMETHANAMINE 6-BROMO-2-PYRIDINEMETHANAMINE 188637-63-0 C6H7BrN2
6-(DIMETHYLAMINO)NICOTINIC ACID 6-(DIMETHYLAMINO)NICOTINIC ACID 82846-28-4 C8H10N2O2
LY 272015 HYDROCHLORIDE LY 272015 HYDROCHLORIDE 172895-15-7 C21H25ClN2O2
5-IODO-1-METHYL-1H-PYRAZOLO[3,4-B] PYRIDIN-3-AMINE 5-IODO-1-METHYL-1H-PYRAZOLO[3,4-B] PYRIDIN-3-AMINE 766515-35-9 C7H7IN4
PYRAZOLO[1,5-A]PYRIMIDINE-5,7(4H,6H)-DIONE PYRAZOLO[1,5-A]PYRIMIDINE-5,7(4H,6H)-DIONE 672323-32-9 C6H5N3O2
2-(4-METHYL-1-PIPERAZINYL)-4-PYRIMIDINAMINE 2-(4-METHYL-1-PIPERAZINYL)-4-PYRIMIDINAMINE 57005-71-7 C9H15N5
4-CHLORO-2-METHYLPYRIMIDINE-5-CARBOXYLIC ACID 4-CHLORO-2-METHYLPYRIMIDINE-5-CARBOXYLIC ACID 933702-81-9 C6H5ClN2O2
2,4-DICHLORO-6-METHYLTHIENO[3,2-D]PYRIMIDINE 2,4-DICHLORO-6-METHYLTHIENO[3,2-D]PYRIMIDINE 35265-82-8 C7H4Cl2N2S
1-(5-NITROPYRIDIN-2-YL)ETHANONE 1-(5-NITROPYRIDIN-2-YL)ETHANONE 31557-75-2 C7H6N2O3
2,4-DIMETHOXY-5-PYRIMIDINECARBOXYLIC ACID 2,4-DIMETHOXY-5-PYRIMIDINECARBOXYLIC ACID 110821-07-3 C7H8N2O4
4-Amino-2-chloro-6-(trifluoromethyl)pyridine 4-Amino-2-chloro-6-(trifluoromethyl)pyridine 34486-22-1 C6H4ClF3N2
4-(prop-1-ynyl)pyrimidin-2-amine 4-(prop-1-ynyl)pyrimidin-2-amine 1207175-48-1 C7H7N3
4-Bromo-6-methylisoquinoline 4-Bromo-6-methylisoquinoline 1204298-52-1 C10H8BrN
4-(isoxazol-4-yl)-2-(methylthio)pyrimidine 4-(isoxazol-4-yl)-2-(methylthio)pyrimidine 956721-96-3 C8H7N3OS
2-(Methylsulfonyl)-4-pyridinamine 2-(Methylsulfonyl)-4-pyridinamine 944401-88-1 C6H8N2O2S
Methyl2-(2-pyrimidyl)acetate Methyl2-(2-pyrimidyl)acetate 60561-50-4 C7H8N2O2
2-phenylthieno[2,3-d]pyrimidin-4-ol 2-phenylthieno[2,3-d]pyrimidin-4-ol 56843-76-6 C12H8N2OS
5,6-dichloropyridazin-4-amine 5,6-dichloropyridazin-4-amine 89180-50-7 C4H3Cl2N3
2-amino-5-bromopyrimidin-4-ol hydrobromide 2-amino-5-bromopyrimidin-4-ol hydrobromide 1215597-17-3 C4H5Br2N3O
3,4-Diamino-2-bromopyridine 3,4-Diamino-2-bromopyridine 189230-41-9 C5H6BrN3
2,3-Diamino-4,5-dichloropyridine 2,3-Diamino-4,5-dichloropyridine 662116-66-7 C5H5Cl2N3
3-fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)picolinonitrile 3-fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)picolinonitrile 1356066-65-3 C12H14BFN2O2
2-Amino-4-methylpyridin-3-ol 2-Amino-4-methylpyridin-3-ol 20348-18-9 C6H8N2O
(4-Chloro-6-methyl-pyrimidin-2-yl)-ethyl-amine (4-Chloro-6-methyl-pyrimidin-2-yl)-ethyl-amine 5748-33-4 C7H10ClN3
(5-Fluoro-pyrimidin-2-yl)-isopropyl-amine (5-Fluoro-pyrimidin-2-yl)-isopropyl-amine 77476-97-2 C7H10FN3
2,4-Dichloro-5-methoxymethyl-pyrimidine 2,4-Dichloro-5-methoxymethyl-pyrimidine 89380-14-3 C6H6Cl2N2O
3-bromo-2,4-dichloropyridine 3-bromo-2,4-dichloropyridine 144584-32-7 C5H2BrCl2N
(5-chloro-3-fluoropyridin-2-yl)MethanaMine hydrochloride (5-chloro-3-fluoropyridin-2-yl)MethanaMine hydrochloride 1257535-29-7 C6H7Cl2FN2
4-Amino-6-chloro-5-fluoropyrimidine 4-Amino-6-chloro-5-fluoropyrimidine 851984-15-1 C4H3ClFN3
4-broMo-2-(trifluoroMethyl)pyriMidine 4-broMo-2-(trifluoroMethyl)pyriMidine 1034827-56-9 C5H2BrF3N2
IMidazo[1,2-a]pyridine-3-carboxylic acid, 6-chloro- IMidazo[1,2-a]pyridine-3-carboxylic acid, 6-chloro- 138642-97-4 C8H5ClN2O2
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