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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-CHLORO-6-MORPHOLIN-4-YL-PYRIMIDIN-5-YLAMINE 4-CHLORO-6-MORPHOLIN-4-YL-PYRIMIDIN-5-YLAMINE 84762-69-6 C8H11ClN4O
5-HYDROXYPYRIDINE-3,4-DICARBOXYLIC ACID METHYL ESTER 5-HYDROXYPYRIDINE-3,4-DICARBOXYLIC ACID METHYL ESTER 243980-03-2 C8H7NO5
2-BROMO-5-CHLORO-3-METHYLBENZO[B]THIOPHENE 2-BROMO-5-CHLORO-3-METHYLBENZO[B]THIOPHENE 175203-60-8 C9H6BrClS
N,N-DIETHYL-N-[2-(2-PYRIDYL)ETHYL]AMINE N,N-DIETHYL-N-[2-(2-PYRIDYL)ETHYL]AMINE 25877-30-9 C11H18N2
PYRIDINE-2-BORONIC ACID DIMETHYL ESTER PYRIDINE-2-BORONIC ACID DIMETHYL ESTER 136805-54-4 C7H10BNO2
N-(5-BROMOPYRIDIN-2-YL)-2-CHLOROACETAMIDE N-(5-BROMOPYRIDIN-2-YL)-2-CHLOROACETAMIDE 141454-61-7 C7H6BrClN2O
2,6-DIAMINE-3,5-DIBROMOPYRIDINE 2,6-DIAMINE-3,5-DIBROMOPYRIDINE 76942-20-6 C5H5Br2N3
2,4-DICHLOROPYRIDINE-5-BORONIC ACID HYDRATE 2,4-DICHLOROPYRIDINE-5-BORONIC ACID HYDRATE 1072952-26-1 C5H6BCl2NO3
4-HYDROXYTHIENO[2,3-B]PYRIDINE-5-CARBOXYLIC ACID ETHYL ESTER 4-HYDROXYTHIENO[2,3-B]PYRIDINE-5-CARBOXYLIC ACID ETHYL ESTER 55503-31-6 C10H9NO3S
4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-QUINOLINE 4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-QUINOLINE 1035458-54-8 C15H18BNO2
TRIOXSALEN TRIOXSALEN 3902-71-4 C14H12O3
2,4,6-TRIFLUORO-5-METHYLPYRIMIDINE 2,4,6-TRIFLUORO-5-METHYLPYRIMIDINE 18260-60-1 C5H3F3N2
2-FORMYLPYRIDINE-5-BORONIC ACID PINACOLATE 2-FORMYLPYRIDINE-5-BORONIC ACID PINACOLATE 1073354-14-9 C12H16BNO3
4-DIMETHOXYMETHYL-2-TRIFLUOROMETHYL-PYRIMIDINE 4-DIMETHOXYMETHYL-2-TRIFLUOROMETHYL-PYRIMIDINE 878760-47-5 C8H9F3N2O2
ETHYL 2,4-DIAMINO-PYRIMIDINE-5-CARBOXYLATE ETHYL 2,4-DIAMINO-PYRIMIDINE-5-CARBOXYLATE 15400-54-1 C7H10N4O2
METHYL 4-BROMO-3-HYDROXYTHIOPHENE-2-CARBOXYLATE METHYL 4-BROMO-3-HYDROXYTHIOPHENE-2-CARBOXYLATE 95201-93-7 C6H5BrO3S
6-HYDROXY-2-METHYLPYRIMIDINE-4-ACETIC ACID METHYL ESTER 6-HYDROXY-2-METHYLPYRIMIDINE-4-ACETIC ACID METHYL ESTER 64532-22-5 C7H8N2O3
1-(2-CHLORO-3-PYRIDINYL)-3,3-DIMETHYL-2-AZETANONE 1-(2-CHLORO-3-PYRIDINYL)-3,3-DIMETHYL-2-AZETANONE C10H11ClN2O
2,6-Pyridinedicarbonitrile 2,6-Pyridinedicarbonitrile 2893-33-6 C7H3N3
3-(PYRROL-1-YLMETHYL)PYRIDINE 3-(PYRROL-1-YLMETHYL)PYRIDINE 80866-95-1 C10H10N2
Indibulin Indibulin 204205-90-3 C22H16ClN3O2
2-(N-Methylaminocarbonyl)-5-pyridineboronic acid pincol ester 2-(N-Methylaminocarbonyl)-5-pyridineboronic acid pincol ester 945863-21-8 C13H19BN2O3
4-PIPERIDIN-4-YLMETHYLPYRIDINE DIHYDROCHLORIDE 4-PIPERIDIN-4-YLMETHYLPYRIDINE DIHYDROCHLORIDE 1172465-66-5 C11H18Cl2N2
3-Pyridazinecarboxylic acid methyl ester 3-Pyridazinecarboxylic acid methyl ester 34253-02-6 C6H6N2O2
2-Chloro-6-methyl-4-(trifluoromethyl)pyridine 2-Chloro-6-methyl-4-(trifluoromethyl)pyridine 22123-14-4 C7H5ClF3N
8-Chloro-2-(methylthio)pyrimido[5,4-d]pyrimidine 8-Chloro-2-(methylthio)pyrimido[5,4-d]pyrimidine 176637-10-8 C7H5ClN4S
5-Fluoro-2-[[(1S)-1-(4-fluorophenyl)ethyl]amino]-6-[(5-methyl-1H-pyrazol-3-yl)amino]-3-pyridinecarbonitrile 5-Fluoro-2-[[(1S)-1-(4-fluorophenyl)ethyl]amino]-6-[(5-methyl-1H-pyrazol-3-yl)amino]-3-pyridinecarbonitrile 905586-69-8 C18H16F2N6
2-bromo-4-mehtoxyl-5-hydroxybenzoic acid 2-bromo-4-mehtoxyl-5-hydroxybenzoic acid 121936-68-3 C8H7BrO4
3-Bromo-1-[tris(1-methylethyl)silyl]-1H-pyrrolo[2,3-b]pyridine 3-Bromo-1-[tris(1-methylethyl)silyl]-1H-pyrrolo[2,3-b]pyridine 918525-02-7 C16H25BrN2Si
2-Methoxy-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3-(trifluoromethyl)pyridine 2-Methoxy-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3-(trifluoromethyl)pyridine 1150561-61-7 C13H17BF3NO3
6-Bromo-2-ethylaminopyridine,HCl 6-Bromo-2-ethylaminopyridine,HCl 724770-74-5 C7H9BrN2
2,5-Dichloro-4-methylpyrimidine 2,5-Dichloro-4-methylpyrimidine 1192064-63-3 C5H4Cl2N2
Methyl5-bromo-2-(methylsulfonyl)pyrimidine-4-carboxylate Methyl5-bromo-2-(methylsulfonyl)pyrimidine-4-carboxylate 1060795-14-3 C7H7BrN2O4S
2-Bromo-5-nitro-4-Pyridinecarboxylic acid 2-Bromo-5-nitro-4-Pyridinecarboxylic acid 1053655-82-5 C6H3BrN2O4
6-Iodo-uridine 6-Iodo-uridine 105967-11-1 C9H11IN2O6
4-oxo-3,4-dihydro[1]benzofuro[3,2-d]pyrimidin-4(3H)-one 4-oxo-3,4-dihydro[1]benzofuro[3,2-d]pyrimidin-4(3H)-one 39786-36-2 C10H6N2O2
1-(4-iodophenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one 1-(4-iodophenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one 473927-69-4 C15H17IN2O2
6-Bromo-2-methylpyridine-3-carboxaldehyde 6-Bromo-2-methylpyridine-3-carboxaldehyde 926293-55-2 C7H6BrNO
5-Bromo-3-(trifluoromethyl)-2-pyridinecarbonitrile 5-Bromo-3-(trifluoromethyl)-2-pyridinecarbonitrile 1214377-57-7 C7H2BrF3N2
6-chloro-5-Methyl-3,6-dihydropyridazin-3-aMine 6-chloro-5-Methyl-3,6-dihydropyridazin-3-aMine 66346-87-0 C5H6ClN3
6-broMopyriMidin-4-aMine 6-broMopyriMidin-4-aMine 1159818-57-1 C4H4BrN3
Pyrido[3,4-d]pyrimidine, 2,4-dichloro-5,6,7,8-tetrahydro-7-(phenylmethyl)- Pyrido[3,4-d]pyrimidine, 2,4-dichloro-5,6,7,8-tetrahydro-7-(phenylmethyl)- 1059735-34-0 C14H13Cl2N3
1-BOC-PIPERAZINE 1-BOC-PIPERAZINE 57260-72-7 C11H20N2O6
3,5-DIETHYL-2-N-PROPYLPYRIDINE 3,5-DIETHYL-2-N-PROPYLPYRIDINE 4808-75-7 C12H19N
5-FLUORO-2-METHOXYPYRIDINE-3-BORONIC ACID PINACOL ESTER 5-FLUORO-2-METHOXYPYRIDINE-3-BORONIC ACID PINACOL ESTER 1083168-95-9 C12H17BFNO3
1-OCTYLPIPERAZINE 1-OCTYLPIPERAZINE 54256-45-0 C12H26N2
(3-HYDROXYMETHYL-PYRIDIN-2-YL)-CARBAMIC ACID TERT-BUTYL ESTER (3-HYDROXYMETHYL-PYRIDIN-2-YL)-CARBAMIC ACID TERT-BUTYL ESTER 877593-11-8 C11H16N2O3
ETHYL 6-(TERT-BUTYL)-3-CYANO-2-HYDROXYISONICOTINATE ETHYL 6-(TERT-BUTYL)-3-CYANO-2-HYDROXYISONICOTINATE 100616-09-9 C13H16N2O3
4-(MORPHOLINE-4-SULFONYL)-BENZENESULFONYL CHLORIDE 4-(MORPHOLINE-4-SULFONYL)-BENZENESULFONYL CHLORIDE 465514-13-0 C10H12ClNO5S2
2,5-DIBROMONICOTINALDEHYDE 2,5-DIBROMONICOTINALDEHYDE 852181-11-4 C6H3Br2NO
2-OXO-6-PHENYL-1,2-DIHYDRO-PYRIDINE-3-CARBOXYLIC ACID 2-OXO-6-PHENYL-1,2-DIHYDRO-PYRIDINE-3-CARBOXYLIC ACID 56162-63-1 C12H9NO3
2,3,5-TRIFLUOROISONICOTINIC ACID 2,3,5-TRIFLUOROISONICOTINIC ACID C6H2F3NO2
5-AMINO-6-CHLORO-PYRIMIDIN-4-OL 5-AMINO-6-CHLORO-PYRIMIDIN-4-OL C4H4ClN3O
4-AMINO-6-TERT-BUTYLPYRIMIDINE 4-AMINO-6-TERT-BUTYLPYRIMIDINE 3435-27-6 C8H13N3
2-chloro-N-(1-methylethyl)pyrimidin-4-amine 2-chloro-N-(1-methylethyl)pyrimidin-4-amine 71406-72-9 C7H10ClN3
2-methylthieno[3,2-d]pyrimidin-4(3H)-one 2-methylthieno[3,2-d]pyrimidin-4(3H)-one 18678-13-2 C7H6N2OS
1H-Pyrazolo[3,4-d]pyrimidine-4,6-diamine (9CI) 1H-Pyrazolo[3,4-d]pyrimidine-4,6-diamine (9CI) 5413-80-9 C5H6N6
2-Pyrimidinamine, N-methyl- (9CI) 2-Pyrimidinamine, N-methyl- (9CI) 931-61-3 C5H7N3
4-Pyrimidinecarboxaldehyde, 2-methoxy- (9CI) 4-Pyrimidinecarboxaldehyde, 2-methoxy- (9CI) 164738-44-7 C6H6N2O2
Pyrimidine, 5-bromo-2-ethyl- (9CI) Pyrimidine, 5-bromo-2-ethyl- (9CI) 873331-73-8 C6H7BrN2
2(1H)-Pyrimidinone, 5-acetyl-4-methyl- (9CI) 2(1H)-Pyrimidinone, 5-acetyl-4-methyl- (9CI) 113246-41-6 C7H8N2O2
2-Pyridinecarboxylic acid, 4-hydroxy-, methyl ester (9CI) 2-Pyridinecarboxylic acid, 4-hydroxy-, methyl ester (9CI) 473269-77-1 C7H7NO3
5-Pyrimidinecarboxaldehyde, 2-(ethylamino)- (9CI) 5-Pyrimidinecarboxaldehyde, 2-(ethylamino)- (9CI) 137279-29-9 C7H9N3O
(2E)-3-[6-(TRIFLUOROMETHYL)PYRIDIN-3-YL]PROPENOICACID
(2E)-3-[6-(TRIFLUOROMETHYL)PYRIDIN-3-YL]PROPENOICACID 773131-93-4 C9H6F3NO2
3-AMINO-6-CHLORO-4,5-DIMETHYLPYRIDAZINE 3-AMINO-6-CHLORO-4,5-DIMETHYLPYRIDAZINE 76593-36-7 C6H8ClN3
3,5,6-Trichloropyrid 3,5,6-Trichloropyrid
5-ETHYL-6-CHLOROURACIL 5-ETHYL-6-CHLOROURACIL 20295-24-3 C6H7ClN2O2
6-HYDROXY-3-PYRIDINESULPHONIC ACID 6-HYDROXY-3-PYRIDINESULPHONIC ACID 6684-46-4 C5H5NO4S
2-Bromo-5-fluoroisonicotinic acid 2-Bromo-5-fluoroisonicotinic acid 885588-12-5 C6H3BrFNO2
5-hydroxypyridine-2-carbaldehyde 5-hydroxypyridine-2-carbaldehyde 31191-08-9 C6H5NO2
5-Chloro-2-fluoro-4-methylpyridine 5-Chloro-2-fluoro-4-methylpyridine C6H5ClFN
2,6-Dichloropyridine-4-boronicacid 2,6-Dichloropyridine-4-boronicacid 1072951-54-2 C5H4BCl2NO2
4-Amino-3-fluoropyridine 4-Amino-3-fluoropyridine 2447-88-3 C12H15Cl2NO
6-BROMO-2-METHYLPYRIDINE-3-BORONIC ACID 6-BROMO-2-METHYLPYRIDINE-3-BORONIC ACID 1072944-22-9 C6H7BBrNO2
3,5-Difluoro-4-pyridinecarboxaldehyde 3,5-Difluoro-4-pyridinecarboxaldehyde 870234-98-3 C6H3F2NO
6-CHLORO-3-IODOIMIDAZO[1,2-B]PYRIDAZINE 6-CHLORO-3-IODOIMIDAZO[1,2-B]PYRIDAZINE 923595-49-7 C6H3ClIN3
6-CHLORO-3-METHYL-IMIDAZO[1,2-B]PYRIDAZINE 6-CHLORO-3-METHYL-IMIDAZO[1,2-B]PYRIDAZINE 137384-48-6 C7H6ClN3
3-AMINO-2-CHLORO-ISONICOTINAMIDE 3-AMINO-2-CHLORO-ISONICOTINAMIDE 342899-34-7 C6H6ClN3O
7-METHYL-3,4-DIHYDROTHIENO[3,2-D]PYRIMIDIN-4-ONE 7-METHYL-3,4-DIHYDROTHIENO[3,2-D]PYRIMIDIN-4-ONE 175137-13-0 C7H6N2OS
6-CHLORO-2-IODO-3-(TRIFLUOROMETHYL)PYRIDINE 6-CHLORO-2-IODO-3-(TRIFLUOROMETHYL)PYRIDINE 518057-64-2 C6H2ClF3IN
3,6-Dibromo-2-chloropyridine 3,6-Dibromo-2-chloropyridine 942206-18-0 C5H2Br2ClN
6-Chloromethyl-2-cyanopyridine 6-Chloromethyl-2-cyanopyridine 135450-23-6 C7H5ClN2
1,4-DI(2-THIENYL)-1,3-BUTADIENE 1,4-DI(2-THIENYL)-1,3-BUTADIENE 23354-93-0 C12H10S2
6-MORPHOLINONICOTINALDEHYDE 6-MORPHOLINONICOTINALDEHYDE 173282-60-5 C10H12N2O2
5-Bromobenzo[c]thiophene 5-Bromobenzo[c]thiophene 133150-64-8 C8H5BrS
(R)-(+)-Dropropizine (R)-(+)-Dropropizine 99291-24-4 C13H20N2O2
Methyl 4-hydroxynicotinate Methyl 4-hydroxynicotinate 67367-24-2 C7H7NO3
6-TERT-BUTYL-4-CHLOROTHIENO[2,3-D]PYRIMIDINE 6-TERT-BUTYL-4-CHLOROTHIENO[2,3-D]PYRIMIDINE 439692-55-4 C10H11ClN2S
1,3-DIMETHYL-2-FLUOROPYRIDINIUM TOLUENE-4-SULFONATE 1,3-DIMETHYL-2-FLUOROPYRIDINIUM TOLUENE-4-SULFONATE 59387-91-6 C14H16FNO3S
8-Amino-4-methylquinoline 8-Amino-4-methylquinoline 62748-01-0 C10H10N2
Methyl 5-nitro-2-pyridinecarboxylate Methyl 5-nitro-2-pyridinecarboxylate 29682-14-2 C7H6N2O4
2-BROMO-3-(CHLOROMETHYL)PYRIDINE 2-BROMO-3-(CHLOROMETHYL)PYRIDINE 89581-84-0 C6H5Cl2N
IMIDAZO[1,2-B]PYRIDAZIN-6-AMINE IMIDAZO[1,2-B]PYRIDAZIN-6-AMINE 6653-96-9 C6H6N4
6-HYDROXYIMIDAZO[1,2-B]PYRIDAZINE 6-HYDROXYIMIDAZO[1,2-B]PYRIDAZINE 57470-54-9 C6H5N3O
2,6-DICHLORO-4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PYRIDINE 2,6-DICHLORO-4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PYRIDINE 408492-27-3 C11H14BCl2NO2
6-CHLORO-4-IODOPYRIDIN-3-AMINE 6-CHLORO-4-IODOPYRIDIN-3-AMINE 351227-42-4 C5H4ClIN2
ETHYL 4-AMINOPYRIMIDINE-2-CARBOXYLATE ETHYL 4-AMINOPYRIMIDINE-2-CARBOXYLATE 71470-41-2 C7H9N3O2
PYRIDINE, 5-BROMO-2-(DIFLUOROMETHOXY)- PYRIDINE, 5-BROMO-2-(DIFLUOROMETHOXY)- 899452-26-7 C6H4BrF2NO
tert-Butyl 7,8-dihydropyrido[4,3-d]pyrimidine-6(5H)-carboxylate tert-Butyl 7,8-dihydropyrido[4,3-d]pyrimidine-6(5H)-carboxylate 192869-49-1 C12H17N3O2
3-Phenyl-5,6-dichloropyridazine 3-Phenyl-5,6-dichloropyridazine 64942-62-7 C10H6Cl2N2
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