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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-Iodo-2-methylpyridine 3-Iodo-2-methylpyridine 15112-62-6 C6H6IN
4-Chloro-2,3-difluoropyridine 4-Chloro-2,3-difluoropyridine 851178-99-9 C5H2ClF2N
4-Chloropyridine-2-carboxylic acid ethyl ester 4-Chloropyridine-2-carboxylic acid ethyl ester 64064-56-8 C8H8ClNO2
Pyridine-2,3,4-triamine Pyridine-2,3,4-triamine 52559-11-2 C5H8N4
Pyrido[3,4-d]pyrimidin-4(3H)-one (8CI,9CI) Pyrido[3,4-d]pyrimidin-4(3H)-one (8CI,9CI) 19178-25-7 C7H5N3O
Pyridine, 2-bromo-5-(bromomethyl)- (9CI) Pyridine, 2-bromo-5-(bromomethyl)- (9CI) 101990-45-8 C6H5Br2N
4-Benzylaminopyridine 4-Benzylaminopyridine 13556-71-3 C12H12N2
Pyridine, 3-bromo-4-ethyl- (9CI) Pyridine, 3-bromo-4-ethyl- (9CI) 38749-76-7 C7H8BrN
2-Pyridinamine, 6-chloro-5-methyl 2-Pyridinamine, 6-chloro-5-methyl 442129-37-5 C6H7ClN2
2,3,5-Trimethylpyridine-1-Oxide 2,3,5-Trimethylpyridine-1-Oxide 74409-42-0 C8H11NO
4-AMINO-2-(1-PIPERIDINYL)PYRIMIDINE-5-CARBONITRILE 4-AMINO-2-(1-PIPERIDINYL)PYRIMIDINE-5-CARBONITRILE 90973-23-2 C10H13N5
(4-HYDROXY-2,6-DIMETHYL-PYRIMIDIN-5-YL)-ACETIC ACID (4-HYDROXY-2,6-DIMETHYL-PYRIMIDIN-5-YL)-ACETIC ACID 5536-40-3 C8H10N2O3
TERT-BUTYL (5-FORMYLPYRIDIN-2-YL)CARBAMATE TERT-BUTYL (5-FORMYLPYRIDIN-2-YL)CARBAMATE 199296-40-7 C11H14N2O3
Pyrimidine, 5-(chloromethyl)-2-methyl- (9CI) Pyrimidine, 5-(chloromethyl)-2-methyl- (9CI) 126504-86-7 C6H7ClN2
5-Pyrimidinecarboxylic acid, 2-(methylamino)- (7CI,8CI,9CI) 5-Pyrimidinecarboxylic acid, 2-(methylamino)- (7CI,8CI,9CI) 5388-21-6 C6H7N3O2
2,6-DINITRO-3-CHLOROPYRIDINE 2,6-DINITRO-3-CHLOROPYRIDINE 101079-67-8 C5H2ClN3O4
2-CHLORO-3-HYDROXY-5-PICOLINE 2-CHLORO-3-HYDROXY-5-PICOLINE 910649-59-1 C6H6ClNO
1H-Pyrazolo[3,4-d]pyrimidin-4-amine, 3-methyl- (9CI) 1H-Pyrazolo[3,4-d]pyrimidin-4-amine, 3-methyl- (9CI) 5399-44-0 C6H7N5
4-BroMo-2-MethylpyriMidine 4-BroMo-2-MethylpyriMidine 1114560-76-7 C5H5BrN2
2-Chloro-3-methyl-4-nitropyridine 1-oxide 2-Chloro-3-methyl-4-nitropyridine 1-oxide 60323-95-7 C6H5ClN2O3
1-PYRIMIDIN-2-YL-PIPERIDIN-4-OL 1-PYRIMIDIN-2-YL-PIPERIDIN-4-OL 893755-98-1 C9H13N3O
PF-04691502 PF-04691502 1013101-36-4 C22H27N5O4
5-METHYLNICOTINAMIDE 5-METHYLNICOTINAMIDE 70-57-5 C7H8N2O
5-FORMYL-2-METHOXY-4-PICOLINE 5-FORMYL-2-METHOXY-4-PICOLINE 123506-66-1 C8H9NO2
3-BROMO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 3-BROMO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 458532-92-8 C11H15BBrNO2
3-(ETHOXYCARBONYL)PYRIDINE-5-BORONIC ACID PINACOL ESTER 3-(ETHOXYCARBONYL)PYRIDINE-5-BORONIC ACID PINACOL ESTER 916326-10-8 C14H20BNO4
(3-AMINO-PYRIDIN-2-YL)-METHANOL (3-AMINO-PYRIDIN-2-YL)-METHANOL 52378-63-9 C6H8N2O
5-ACETYL-2,2'-BITHIENYL 5-ACETYL-2,2'-BITHIENYL 3515-18-2 C10H8OS2
THIAZOLO[4,5-C]PYRIDIN-2-AMINE THIAZOLO[4,5-C]PYRIDIN-2-AMINE 89786-54-9 C6H5N3S
QUINOLINE-3-CARBOXYLIC ACID QUINOLINE-3-CARBOXYLIC ACID 118803-81-9 C10H7NO2
2-(TETRAHYDRO-2H-PYRAN-2-YLOXY)ETHANOL 2-(TETRAHYDRO-2H-PYRAN-2-YLOXY)ETHANOL 2162-31-4 C7H14O3
1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 18513-79-6 C5H10ClN
2-(3'-PYRIDYL)BENZOIC ACID 2-(3'-PYRIDYL)BENZOIC ACID 134363-45-4 C12H9NO2
5,7-Dimethoxycoumarin 5,7-Dimethoxycoumarin 487-06-9 C11H10O4
METHYL-5-BROMOMETHYLPYRIDINE-2-CARBOXYLATE METHYL-5-BROMOMETHYLPYRIDINE-2-CARBOXYLATE 55876-84-1 C8H8BrNO2
1-METHYL-1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 1-METHYL-1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 73107-26-3 C6H12ClN
4-(DIMETHYLAMINO)-1-(TRIFLUOROACETYL)-PYRIDINIUM TRIFLUOROACETATE 4-(DIMETHYLAMINO)-1-(TRIFLUOROACETYL)-PYRIDINIUM TRIFLUOROACETATE 181828-01-3 C11H10F6N2O3
1-ALLYLPIPERAZINE 1-ALLYLPIPERAZINE 13961-36-9 C7H14N2
(2-CHLORO-BENZYL)-PYRIDIN-2-YLMETHYL-AMINE (2-CHLORO-BENZYL)-PYRIDIN-2-YLMETHYL-AMINE 680185-71-1 C13H13ClN2
2-FLUORO-3-(HYDROXYMETHYL)PYRIDINE 2-FLUORO-3-(HYDROXYMETHYL)PYRIDINE 131747-55-2 C6H6FNO
2-CHLORO-3-FLUOROPYRIDINE N-OXIDE 2-CHLORO-3-FLUOROPYRIDINE N-OXIDE 85386-94-3 C5H3ClFNO
3-CARBOMETHOXY-2-PYRONE 3-CARBOMETHOXY-2-PYRONE 25991-27-9 C7H6O4
ETHYL 4-(METHYLAMINO)-2-(METHYLSULFANYL)-5-PYRIMIDINECARBOXYLATE ETHYL 4-(METHYLAMINO)-2-(METHYLSULFANYL)-5-PYRIMIDINECARBOXYLATE 76360-82-2 C9H13N3O2S
1,4-DICHLOROISOQUINOLINE 1,4-DICHLOROISOQUINOLINE 15298-58-5 C9H5Cl2N
5-IODO-6-METHYLURACIL 5-IODO-6-METHYLURACIL 1461-67-2 C5H5IN2O2
2-ACETAMIDO-5-PYRIDINECARBOXYLIC ACID 2-ACETAMIDO-5-PYRIDINECARBOXYLIC ACID 21550-48-1 C8H8N2O3
5-CHLORO-2-METHOXYNICOTINIC ACID 5-CHLORO-2-METHOXYNICOTINIC ACID 54916-65-3 C7H6ClNO3
2-MORPHOLIN-4-YL-ISONICOTINIC ACID 2-MORPHOLIN-4-YL-ISONICOTINIC ACID 295349-64-3 C10H12N2O3
1-BENZYL-4,4-DIFLUOROPIPERIDINE 1-BENZYL-4,4-DIFLUOROPIPERIDINE 155137-18-1 C12H15F2N
2-AMINO-4-CHLORO-6-ETHOXYPYRIMIDINE 2-AMINO-4-CHLORO-6-ETHOXYPYRIMIDINE 89784-02-1 C6H8ClN3O
4-AMINOPYRIDINE-3-CARBOXYLIC ACID ETHYL ESTER 4-AMINOPYRIDINE-3-CARBOXYLIC ACID ETHYL ESTER 16952-66-2 C8H10N2O2
6-BROMOCOUMARIN-3-CARBOXYLIC ACID 6-BROMOCOUMARIN-3-CARBOXYLIC ACID 2199-87-3 C10H5BrO4
2,3,5,6-TETRAFLUOROPYRIDINE-4-PROPIONIC ACID 2,3,5,6-TETRAFLUOROPYRIDINE-4-PROPIONIC ACID 916792-08-0 C8H5F4NO2
2-HYDRAZINO-6-METHYLPYRIMIDIN-4-OL 2-HYDRAZINO-6-METHYLPYRIMIDIN-4-OL C5H8N4O
4-Bromopyridine N-Oxide 4-Bromopyridine N-Oxide 14248-50-1 C5H4BrNO
2-Pyridinemethanamine,6-fluoro-(9CI) 2-Pyridinemethanamine,6-fluoro-(9CI) 205744-18-9 C6H7FN2
6-Methyl-3-pyridineethanol 6-Methyl-3-pyridineethanol 100189-17-1 C8H11NO
2-Pyridinecarboxylicacid,1,6-dihydro-3-methyl-6-oxo-(9CI) 2-Pyridinecarboxylicacid,1,6-dihydro-3-methyl-6-oxo-(9CI) 115185-81-4 C7H7NO3
4H-Pyrano[3,2-b]pyridin-4-one,2,3-dihydro-(9CI) 4H-Pyrano[3,2-b]pyridin-4-one,2,3-dihydro-(9CI) 405174-48-3 C8H7NO2
2-Pyrimidinecarboxylicacid,4-amino-,methylester(9CI) 2-Pyrimidinecarboxylicacid,4-amino-,methylester(9CI) 71470-40-1 C6H7N3O2
4-Pyridylamidoxime 4-Pyridylamidoxime 1594-57-6 C6H7N3O
4-methoxymethylpyridoxine 4-methoxymethylpyridoxine 1464-33-1 C9H13NO3
6-Chloro-3-fluoro-pyridine-2-carboxylic acid 6-Chloro-3-fluoro-pyridine-2-carboxylic acid 884494-76-2 C6H3ClFNO2
2,3,4,5-Tetrachloro-6-(trichloromethyl)pyridine 2,3,4,5-Tetrachloro-6-(trichloromethyl)pyridine 1134-04-9 C6Cl7N
2-(4-CHLOROPHENOXY)-5-NITROPYRIDINE 2-(4-CHLOROPHENOXY)-5-NITROPYRIDINE 28232-30-6 C11H7ClN2O3
3-AMINO-2,4-DIBROMO-5-FLUOROPYRIDINE 3-AMINO-2,4-DIBROMO-5-FLUOROPYRIDINE 884494-90-0 C5H3Br2FN2
2-BROMO-6-(1H-PYRAZOL-1-YL)PYRIDINE 2-BROMO-6-(1H-PYRAZOL-1-YL)PYRIDINE 123640-41-5 C8H6BrN3
2-BROMO-5-(TERT-BUTOXYCARBONYLAMINO)PYRIDINE 2-BROMO-5-(TERT-BUTOXYCARBONYLAMINO)PYRIDINE 218594-15-1 C10H13BrN2O2
4,6-dichloro-7H-pyrrolo[2,3-d]pyrimidine 4,6-dichloro-7H-pyrrolo[2,3-d]pyrimidine 97337-32-1 C6H3Cl2N3
6-chloro-7H-pyrrolo[2,3-d]pyrimidine 6-chloro-7H-pyrrolo[2,3-d]pyrimidine 90994-17-5 C6H4ClN3
2-AMINO-5-PHENYLPYRAZINE 2-AMINO-5-PHENYLPYRAZINE 13535-13-2 C10H9N3
3-iodopyridin-4-ol 3-iodopyridin-4-ol 89282-03-1 C5H4INO
5,6-DICHLORO-2,3-DICYANOPYRAZINE 5,6-DICHLORO-2,3-DICYANOPYRAZINE 56413-95-7 C6Cl2N4
2-(CYCLOPROPYLMETHOXY)-5-IODOPYRIDINE 2-(CYCLOPROPYLMETHOXY)-5-IODOPYRIDINE 902837-53-0 C9H10INO
2-Pyridinecarboxylic  acid,5-(trifluoromethyl)-,ethyl  ester 2-Pyridinecarboxylic acid,5-(trifluoromethyl)-,ethyl ester 128072-94-6 C9H8F3NO2
2-AMINO-4-(3-BROMOPHENYL)PYRIMIDINE 2-AMINO-4-(3-BROMOPHENYL)PYRIMIDINE 392307-25-4 C10H8BrN3
5,8-dichloropyrido[2,3-d]pyridazine 5,8-dichloropyrido[2,3-d]pyridazine 703-33-3 C7H3Cl2N3
Pyridoxal 5’-Phosphate Pyridoxal 5’-Phosphate 853645-22-4 C8H10NO6P
2,4-Dichloro-6-methoxypyrimidine 2,4-Dichloro-6-methoxypyrimidine 43212-41-5 C5H4Cl2N2O
5-CHLORO-PYRIDINE-2-SULFONYL CHLORIDE 5-CHLORO-PYRIDINE-2-SULFONYL CHLORIDE 885277-08-7 C5H3Cl2NO2S
2-CHLORO-5-NITRONICOTINIC ACID METHYL ESTER 2-CHLORO-5-NITRONICOTINIC ACID METHYL ESTER 190271-88-6 C7H5ClN2O4
METHYL 2-HYDROXY-5-IODONICOTINATE METHYL 2-HYDROXY-5-IODONICOTINATE 116387-40-7 C7H6INO3
6-METHYLPYRIDINE-2-SULFONAMIDE 6-METHYLPYRIDINE-2-SULFONAMIDE 65938-76-3 C6H8N2O2S
CHEMPACIFIC 38141 CHEMPACIFIC 38141 24103-75-1 C7H9NO
4-(CYCLOPROPYLAMINO)-3-NITROPYRIDINE 4-(CYCLOPROPYLAMINO)-3-NITROPYRIDINE 380605-28-7 C8H9N3O2
2-AMINO-3-(3-BROMOBENZYLAMINO)-PYRIDINE 2-AMINO-3-(3-BROMOBENZYLAMINO)-PYRIDINE 934537-52-7 C12H12BrN3
4,6-DICHLORO-2-(2-PYRIDINYL)PYRIMIDINE 4,6-DICHLORO-2-(2-PYRIDINYL)PYRIMIDINE 10235-65-1 C9H5Cl2N3
4-Bromo-2-methoxypyrimidine 4-Bromo-2-methoxypyrimidine 959240-72-3 C5H5BrN2O
4-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidine 4-chloro-6,7-dihydro-5H-cyclopenta[d]pyrimidine 83942-13-6 C7H7ClN2
2-Bromo-3,5-dichloropyridine-4-carboxylic acid 2-Bromo-3,5-dichloropyridine-4-carboxylic acid C6H2BrCl2NO2
3-chloro-7H-pyrrolo[2,3-c]pyridazine 3-chloro-7H-pyrrolo[2,3-c]pyridazine 1207625-18-0 C6H4ClN3
2,5,6-Trichloro-3-pyridinecarbonitrile 2,5,6-Trichloro-3-pyridinecarbonitrile 40381-92-8 C6HCl3N2
5-bromo-3-methylpicolinonitrile 5-bromo-3-methylpicolinonitrile 156072-86-5 C7H5BrN2
2-(2-Chloro-5-iodine benzyl)-5-(3-(6-fluoro-pyridyl)) thiophene 2-(2-Chloro-5-iodine benzyl)-5-(3-(6-fluoro-pyridyl)) thiophene 1131770-46-1 C16H10ClFINS
2-bromo-N-methylpyridin-3-amine 2-bromo-N-methylpyridin-3-amine 872492-60-9 C6H7BrN2
5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-2-(trifluoromethyl)pyridine 5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-2-(trifluoromethyl)pyridine 1218790-39-6 C12H15BF3NO2
5-Methyl-2'-methoxyethoxycytosine 5-Methyl-2'-methoxyethoxycytosine 244105-55-3 C13H21N3O6
5-Bromo-2-cyclopropylpyrimidine 5-Bromo-2-cyclopropylpyrimidine 304902-96-3 C7H7BrN2
6-Chloro-3-Methylpyridine-2-carboxylic Acid 6-Chloro-3-Methylpyridine-2-carboxylic Acid 1201924-32-4 C7H6ClNO2
(2S)-1-[3-Ethyl-7-[[(1-oxido-3-pyridinyl)methyl]amino]pyrazolo[1,5-a]pyrimidin-5-yl]-2-piperidineethanol (2S)-1-[3-Ethyl-7-[[(1-oxido-3-pyridinyl)methyl]amino]pyrazolo[1,5-a]pyrimidin-5-yl]-2-piperidineethanol 779353-01-4 C21H28N6O2
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