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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
6,7-Dihydro-5H-cyclopenta[b]pyridin-7-yl Acetate 6,7-Dihydro-5H-cyclopenta[b]pyridin-7-yl Acetate 90685-59-9 C10H11NO2
2-methyl-3(2H)-Pyridazinone 2-methyl-3(2H)-Pyridazinone 22687-56-5 C5H6N2O
Methyl 5-bromo-2-hydroxypyrimidine-4-carboxylate Methyl 5-bromo-2-hydroxypyrimidine-4-carboxylate 71933-03-4 C6H5BrN2O3
Dimethyl  2-(pyrimidin-4-yl)malonate Dimethyl 2-(pyrimidin-4-yl)malonate 86761-91-3 C9H10N2O4
3-(2-Bromoethyl)oxazolo[4,5-b]pyridin-2(3H)-one 3-(2-Bromoethyl)oxazolo[4,5-b]pyridin-2(3H)-one 134336-95-1 C8H7BrN2O2
(R)-4-(4-(benzyloxy)phenyl)-1-(1-phenylethyl)-1,2,3,6-tetrahydropyridine (R)-4-(4-(benzyloxy)phenyl)-1-(1-phenylethyl)-1,2,3,6-tetrahydropyridine 257928-43-1 C26H27NO
Methyl 1-Benzyl-1,2,3,6-tetrahydropyridine-4-carboxylate Methyl 1-Benzyl-1,2,3,6-tetrahydropyridine-4-carboxylate 80845-58-5 C14H17NO2
5-(4-chlorophenyl)pyriMidin-2-aMine 5-(4-chlorophenyl)pyriMidin-2-aMine 31408-28-3 C10H8ClN3
7,8-dihydro-8-oxo-pyrido[2,3-d]pyridazine-5-carboxylic acid 7,8-dihydro-8-oxo-pyrido[2,3-d]pyridazine-5-carboxylic acid 13629-38-4 C8H5N3O3
(6-Chloro-pyridazin-3-yl)-piperidin-3-yl-aMine hydrochloride (6-Chloro-pyridazin-3-yl)-piperidin-3-yl-aMine hydrochloride 1185307-10-1 C9H14Cl2N4
3-Chloro-6-(piperidin-4-yloxy)-pyridazine hydrochloride 3-Chloro-6-(piperidin-4-yloxy)-pyridazine hydrochloride 1185307-15-6 C9H13Cl2N3O
2-aMino-6-(broMoMethyl)pyriMidin-4-ol 2-aMino-6-(broMoMethyl)pyriMidin-4-ol 1269294-24-7 C5H6BrN3O
4-(pyridin-4-yl)pyriMidin-2-ol 4-(pyridin-4-yl)pyriMidin-2-ol 208936-44-1 C9H7N3O
4-Methyl-2-(trifluoroMethyl)pyriMidine 4-Methyl-2-(trifluoroMethyl)pyriMidine 1017464-05-9 C6H5F3N2
tert-butyl 4-(6-aMinopyridin-3-yl)piperidine-1-carboxylate tert-butyl 4-(6-aMinopyridin-3-yl)piperidine-1-carboxylate 1198408-35-3 C15H23N3O2
4-Chloro-2-methoxy-5-methyl-pyrimidine 4-Chloro-2-methoxy-5-methyl-pyrimidine 1289385-41-6 C6H7ClN2O
(6-Chloro-2-methanesulfonyl-pyrimidin-4-yl)-cyclopropyl-amine (6-Chloro-2-methanesulfonyl-pyrimidin-4-yl)-cyclopropyl-amine 1289388-38-0 C8H10ClN3O2S
Cyclopropyl-(2,6-dichloro-pyrimidin-4-ylmethyl)-amine Cyclopropyl-(2,6-dichloro-pyrimidin-4-ylmethyl)-amine 1289387-98-9 C8H9Cl2N3
ethyl 2-(methylsulfanyl)-4-(trifluoromethyl)pyrimidine-5-carboxylate ethyl 2-(methylsulfanyl)-4-(trifluoromethyl)pyrimidine-5-carboxylate 149771-12-0 C9H9F3N2O2S
2-Pyrimidinecarboxylic acid, 5-hydroxy- (9CI) 2-Pyrimidinecarboxylic acid, 5-hydroxy- (9CI) 345642-87-7 C5H4N2O3
4-Pyrimidinamine, 2-methoxy-6-methyl- (9CI) 4-Pyrimidinamine, 2-methoxy-6-methyl- (9CI) 51870-75-8 C6H9N3O
4-Pyrimidinemethanol, 2-amino-6-methyl- (9CI) 4-Pyrimidinemethanol, 2-amino-6-methyl- (9CI) 110429-43-1 C6H9N3O
5-bromo-2-chloro-4-morpholinopyrimidine 5-bromo-2-chloro-4-morpholinopyrimidine 139502-01-5 C8H9BrClN3O
2-Methylsulfonyl-4,6-dichloro-5-MethylpyriMidine 2-Methylsulfonyl-4,6-dichloro-5-MethylpyriMidine C6H6Cl2N2O2S
2-Amino-6-methyl-5-nitropyridine 2-Amino-6-methyl-5-nitropyridine C6H7N3O2
ZEBULARINE ZEBULARINE
4,6-Dimethyl-2-methylsulfonylpyrimidine 4,6-Dimethyl-2-methylsulfonylpyrimidine C7H10N2O2S
2 - Methyl sulfoniuM - 4, 6-2 hydroxy pyriMidine 2 - Methyl sulfoniuM - 4, 6-2 hydroxy pyriMidine C5H6N2O2S
1,2,3,4-tetramethylbenzene 1,2,3,4-tetramethylbenzene 25619-60-7 C10H14
2H-Pyrido[4,3-b]-1,4-oxazine,3,4-dihydro-(9CI) 2H-Pyrido[4,3-b]-1,4-oxazine,3,4-dihydro-(9CI) 102226-41-5 C7H8N2O
2-Piperazinamine(9CI) 2-Piperazinamine(9CI) 471925-18-5 C4H11N3
3-Pyridinol,6-chloro-2-methyl-(9CI) 3-Pyridinol,6-chloro-2-methyl-(9CI) 218770-02-6 C6H6ClNO
5-(piperidin-1-yl)pyridin-3-amine 5-(piperidin-1-yl)pyridin-3-amine 1314353-75-7 C10H15N3
Methyl 4-amino-5-nitro-2-pyridinecarboxylate Methyl 4-amino-5-nitro-2-pyridinecarboxylate 850544-21-7 C7H7N3O4
3,5-Dichloro-2,4,6-trimethoxypyridine 3,5-Dichloro-2,4,6-trimethoxypyridine 2412-97-7 C8H9Cl2NO3
2-Methoxythiophene 2-Methoxythiophene 130410-20-7 C5H6OS
2-methyl-3,5-dichloro-6-aminopyridine 2-methyl-3,5-dichloro-6-aminopyridine C6H6Cl2N2
6''-AMINO-1,2,3,4-TETRAHYDROQUINOLINE 6''-AMINO-1,2,3,4-TETRAHYDROQUINOLINE 103796-41-4 C9H12N2
2-CYANO-6-TRIFLUOROMETHYLPYRIDINE 2-CYANO-6-TRIFLUOROMETHYLPYRIDINE C7H3F3N2
1H-Pyrrolo[2,3-b]pyridin-5-ol, 4-chloro-1-[tris(1-methylethyl)silyl]- 1H-Pyrrolo[2,3-b]pyridin-5-ol, 4-chloro-1-[tris(1-methylethyl)silyl]- 685513-98-8 C16H25ClN2OSi
N-Benzyl-1,2,3,6-tetrahydropyridine hydrochloride N-Benzyl-1,2,3,6-tetrahydropyridine hydrochloride 80477-52-7 C12H16ClN
2-AMINO-6-ISOPROPYLPYRIMIDINE-4-CARBOXYLIC ACID 2-AMINO-6-ISOPROPYLPYRIMIDINE-4-CARBOXYLIC ACID 938458-89-0 C8H11N3O2
1-(6-CHLORO-PYRIDAZIN-3-YL)-PIPERIDIN-3-OL 1-(6-CHLORO-PYRIDAZIN-3-YL)-PIPERIDIN-3-OL 939986-92-2 C9H12ClN3O
4,5-DICHLORO-6-HYDROXYPYRIMIDINE 4,5-DICHLORO-6-HYDROXYPYRIMIDINE 88982-91-6 C4H2Cl2N2O
1,5-DICHLOROISOQUINOLINE 1,5-DICHLOROISOQUINOLINE 70810-23-0 C9H5Cl2N
3-(Chloromethyl)isoquinoline 3-(Chloromethyl)isoquinoline 147937-36-8 C10H8ClN
5-[4-(Dimethylamino)phenyl]-2-pyridinamine 5-[4-(Dimethylamino)phenyl]-2-pyridinamine 503536-77-4 C13H15N3
4-(but-1-ynyl)pyrimidin-2-amine 4-(but-1-ynyl)pyrimidin-2-amine C8H9N3
7-chloro-3,5-dimethylisoxazolo[4,5-d]pyrimidine 7-chloro-3,5-dimethylisoxazolo[4,5-d]pyrimidine 1207175-20-9 C7H6ClN3O
3-Chloro-N-{(1S)-2-[(N,N-dimethylglycyl)amino]-1-[(4-{8-[(1S)-1-hydroxyethyl]imidazo[1,2-a]pyridin-2-yl}phenyl)methyl]ethyl}-4-[(1-methylethyl)oxy]benzamide 3-Chloro-N-{(1S)-2-[(N,N-dimethylglycyl)amino]-1-[(4-{8-[(1S)-1-hydroxyethyl]imidazo[1,2-a]pyridin-2-yl}phenyl)methyl]ethyl}-4-[(1-methylethyl)oxy]benzamide 1088965-37-0 C32H38ClN5O4
3,6-difluoropicolinonitrile 3,6-difluoropicolinonitrile 1214332-12-3 C6H2F2N2
2-Methyl-4-chlor-6-methoxy-pyrimidin 2-Methyl-4-chlor-6-methoxy-pyrimidin 89466-39-7 C6H7ClN2O
3,5-bis-benzyloxy-pyridine-2-carbonitrile 3,5-bis-benzyloxy-pyridine-2-carbonitrile 1000025-92-2 C20H16N2O2
4-amino-6-chloropicolinic acid 4-amino-6-chloropicolinic acid 546141-56-4 C6H5ClN2O2
2-CHLORO-N,6-DIMETHYL-4-PYRIMIDINAMINE 2-CHLORO-N,6-DIMETHYL-4-PYRIMIDINAMINE 3569-33-3 C6H8ClN3
4-BROMO-2-HYDROXYPYRIMIDINE 4-BROMO-2-HYDROXYPYRIMIDINE 548767-83-5 C4H3BrN2O
6-AMINO-3,4-DIHYDRO-2H-ISOQUINOLIN-1-ONE 6-AMINO-3,4-DIHYDRO-2H-ISOQUINOLIN-1-ONE 22246-00-0 C9H10N2O
2-ETHYLOXAZOLO[4,5-B]PYRIDINE 2-ETHYLOXAZOLO[4,5-B]PYRIDINE 52333-88-7 C8H8N2O
Pyridine, 2-fluloro-4-chloro-5-bromo- Pyridine, 2-fluloro-4-chloro-5-bromo- C5H2BrClFN
N-Methyl-2-aminopyridine-3-carboxamide N-Methyl-2-aminopyridine-3-carboxamide 870997-87-8 C7H9N3O
4-isothiocyanato-2,6-dimethylpyrimidine 4-isothiocyanato-2,6-dimethylpyrimidine 928714-57-2 C7H7N3S
6-BROMO-4,5-DICHLORO-3(2H)-PYRIDAZINONE 6-BROMO-4,5-DICHLORO-3(2H)-PYRIDAZINONE 933041-14-6 C4HBrCl2N2O
6-CHLORO-IMIDAZO[1,2-A]PYRIDINE-3-CARBONITRILE 6-CHLORO-IMIDAZO[1,2-A]PYRIDINE-3-CARBONITRILE 123531-24-8 C8H4ClN3
6-Bromomethylisoquinoline hydrobromide 6-Bromomethylisoquinoline hydrobromide 188861-57-6 C10H8BrN.HBr
4-chloro-2-phenylpyrimidine-5-carboxylic acid 4-chloro-2-phenylpyrimidine-5-carboxylic acid 343349-20-2 C11H7ClN2O2
1-[3-(Methylsulfonyl)propyl]-piperazine2HCl 1-[3-(Methylsulfonyl)propyl]-piperazine2HCl 910572-80-4 C8H18N2O2S
2,6-Dichloro-1,4-didihydropyridine-3,5-dicarboxyaldehyde 2,6-Dichloro-1,4-didihydropyridine-3,5-dicarboxyaldehyde 81305-72-8 C7H5Cl2NO2
3,6-Dichloro-4-iodopyridazine 3,6-Dichloro-4-iodopyridazine 130825-13-7 C4HCl2IN2
5-Bromo-2-(tributylstannyl)pyridine 5-Bromo-2-(tributylstannyl)pyridine 611168-46-8 C17H30BrNSn
4-PyridazineMethanaMine hydrochloride 4-PyridazineMethanaMine hydrochloride 1351479-13-4 C5H8ClN3
6-isopropylpyridazin-3(2H)-one 6-isopropylpyridazin-3(2H)-one C7H10N2O
2-Bromo-1-(2-fluoropyridin-3-yl)ethanone hydrobromide 2-Bromo-1-(2-fluoropyridin-3-yl)ethanone hydrobromide 1138033-53-0 C7H5BrFNO.HBr
benzyl 4-(triMethylsilylo×y)-5,6-dihydropyridine-1(2H)-carbo×ylate benzyl 4-(triMethylsilylo×y)-5,6-dihydropyridine-1(2H)-carbo×ylate 1147998-34-2 C16H23NO3Si
4,6-Dichloro-3-pyridazinecarboxylic acid 4,6-Dichloro-3-pyridazinecarboxylic acid 1040246-87-4 C5H2Cl2N2O2
3-Isothiocyanatothiophene 3-Isothiocyanatothiophene 61528-50-5 C5H3NS2
Benzotrithiophene Benzotrithiophene 29150-63-8 C12H6S3
(R)-3-AMINO-4-(3-PYRIDYL)-BUTYRIC ACID-2HCL (R)-3-AMINO-4-(3-PYRIDYL)-BUTYRIC ACID-2HCL 269396-64-7 C9H12N2O2
PYRIDINE-2,4-DICARBOXYLIC ACID MONOHYDRATE PYRIDINE-2,4-DICARBOXYLIC ACID MONOHYDRATE 207671-42-9 C7H7NO5
Di-2-pyridylglyoxal Di-2-pyridylglyoxal 492-73-9 C12H8N2O2
ETHYL 7-HYDROXY-4-OXO-4H-CHROMENE-2-CARBOXYLATE ETHYL 7-HYDROXY-4-OXO-4H-CHROMENE-2-CARBOXYLATE 23866-72-0 C12H10O5
PYRIMIDIN-4-OL PYRIMIDIN-4-OL 542-27-8 C4H4N2O
PYRIMIDINES PYRIMIDINES
4-Methoxy-6-methyl-2-(methylthio)pyrimidine 4-Methoxy-6-methyl-2-(methylthio)pyrimidine 55749-33-2 C7H10N2OS
2,5-DICHLOROTHIOPHENE 2,5-DICHLOROTHIOPHENE 173777-89-4 C4H2Cl2S
2(5 H)-THIOPHENONE 2(5 H)-THIOPHENONE 3354-32-3 C4H4OS
3-(2,5-DIBROMOTHIEN-3-YL)PROPANOIC ACID 3-(2,5-DIBROMOTHIEN-3-YL)PROPANOIC ACID 13191-40-7 C7H6Br2O2S
1,4-DIBROMOISOQUINOLINE 1,4-DIBROMOISOQUINOLINE 51206-40-7 C9H5Br2N
4-PYRIDINEMETHANAMINE, ALPHA,ALPHA-DIMETHYL- 4-PYRIDINEMETHANAMINE, ALPHA,ALPHA-DIMETHYL- 566155-76-8 C8H12N2
4-CHLORO-N-ISOPROPYL-PYRIDINE-2-CARBOXAMIDE 4-CHLORO-N-ISOPROPYL-PYRIDINE-2-CARBOXAMIDE 604813-08-3 C9H11ClN2O
2-(dichloromethyl)pyridine 2-(dichloromethyl)pyridine 4377-35-9 C6H5Cl2N
N1-(6-ethoxypyridazin-3-yl)sulphanilamide N1-(6-ethoxypyridazin-3-yl)sulphanilamide 963-14-4 C12H14N4O3S
1-(4-BROMOBUTANYL)-4-(2-PYRIMIDINYL)-PIPERAZINE 1-(4-BROMOBUTANYL)-4-(2-PYRIMIDINYL)-PIPERAZINE C12H19BrN4
2-Hydroxy-6-methylpyridine-3-carboxylic acid ethyl ester 2-Hydroxy-6-methylpyridine-3-carboxylic acid ethyl ester 51146-04-4 C9H11NO3
6-Amino-5-nitro-3-pyridinesulfonic acid 6-Amino-5-nitro-3-pyridinesulfonic acid 62009-38-5 C5H5N3O5S
5-BroMo-2-aMino-pyriMidine 5-BroMo-2-aMino-pyriMidine C4H4BrN3
Thieno[3,2-c]pyridin-4-amine (9CI) Thieno[3,2-c]pyridin-4-amine (9CI) 215453-35-3 C7H6N2S
Furo[2,3-c]pyridine-2-carboxaldehyde (9CI) Furo[2,3-c]pyridine-2-carboxaldehyde (9CI) 112372-06-2 C8H5NO2
Pyridine, 3-(chloromethyl)-5-methyl- (9CI) Pyridine, 3-(chloromethyl)-5-methyl- (9CI) 158876-83-6 C7H8ClN
3-(ChloroMethyl)-2-Methylpyridine 3-(ChloroMethyl)-2-Methylpyridine 120277-68-1 C7H8ClN
4-Isopropyl-2-methyl-pyrimidine-5-carboxylic	acid 4-Isopropyl-2-methyl-pyrimidine-5-carboxylic acid 127958-08-1 C9H12N2O2
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