一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

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.

Click on the specific product, view the latest prices of the products, information, serving information
Structure Chemical Name CAS MF
5-Formyl-2-thiopheneboronic acid 5-Formyl-2-thiopheneboronic acid 4347-33-5 C5H5BO3S
Chiniofon Chiniofon 547-91-1 C9H6INO4S
4-Chloropyridine-2-carboxylic acid 4-Chloropyridine-2-carboxylic acid 5470-22-4 C6H4ClNO2
Quinaldic acid Quinaldic acid 93-10-7 C10H7NO2
5-Hydroxynicotinic acid 5-Hydroxynicotinic acid 27828-71-3 C6H5NO3
4-Bromoisoquinoline 4-Bromoisoquinoline 1532-97-4 C9H6BrN
2,8-Bis(trifluoromethyl)-4-quinolinol 2,8-Bis(trifluoromethyl)-4-quinolinol 35853-41-9 C11H5F6NO
5-Bromo-2-methoxypyridine 5-Bromo-2-methoxypyridine 13472-85-0 C6H6BrNO
2,2':5',2''-TERTHIOPHENE 2,2':5',2''-TERTHIOPHENE 1081-34-1 C12H8S3
6-BROMO-2-CHLORO-QUINOLINE 6-BROMO-2-CHLORO-QUINOLINE 1810-71-5 C9H5BrClN
5-Bromothiophene-2-carbaldehyde 5-Bromothiophene-2-carbaldehyde 4701-17-1 C5H3BrOS
5-CHLORO-PYRAZINE-2-CARBOXYLIC ACID 5-CHLORO-PYRAZINE-2-CARBOXYLIC ACID 36070-80-1 C5H3ClN2O2
6-Aminoquinoline 6-Aminoquinoline 580-15-4 C9H8N2
6-Bromonicotinic acid 6-Bromonicotinic acid 6311-35-9 C6H4BrNO2
4-methylquinoline 4-methylquinoline 491-35-0 C10H9N
2-Bromo-3-methylthiophene 2-Bromo-3-methylthiophene 14282-76-9 C5H5BrS
6-Quinolinol 6-Quinolinol 580-16-5 C9H7NO
4-Bromomethyl-1,2-dihydroquinoline-2-one 4-Bromomethyl-1,2-dihydroquinoline-2-one 4876-10-2 C10H8BrNO
7-Chloroquinolin-4-ol 7-Chloroquinolin-4-ol 86-99-7 C9H6ClNO
7-Hydroxyquinoline 7-Hydroxyquinoline 580-20-1 C9H7NO
2-Picolinic acid 2-Picolinic acid 98-98-6 C6H5NO2
2-Fluoroisonicotinic acid 2-Fluoroisonicotinic acid 402-65-3 C6H4FNO2
6-Methoxyquinoline 6-Methoxyquinoline 5263-87-6 C10H9NO
6-BROMO-3-PYRIDAZINAMINE 6-BROMO-3-PYRIDAZINAMINE 88497-27-2 C4H4BrN3
2,8-Quinolinediol 2,8-Quinolinediol 15450-76-7 C9H7NO2
5-Pyrimidinylboronic acid 5-Pyrimidinylboronic acid 109299-78-7 C4H5BN2O2
2-Chloro-4-amino-6,7-dimethoxyquinazoline 2-Chloro-4-amino-6,7-dimethoxyquinazoline 23680-84-4 C10H10ClN3O2
5,7-Dichloro-8-hydroxyquinoline 5,7-Dichloro-8-hydroxyquinoline 773-76-2 C9H5Cl2NO
4-CHLORO-2-(TRIFLUOROMETHYL)QUINOLINE 4-CHLORO-2-(TRIFLUOROMETHYL)QUINOLINE 1701-24-2 C10H5ClF3N
7-Chloro-2-methylquinoline 7-Chloro-2-methylquinoline 4965-33-7 C10H8ClN
5-Bromopyridine-2-carbaldehyde 5-Bromopyridine-2-carbaldehyde 31181-90-5 C6H4BrNO
6-CHLORO-1H-PYRROLO[2,3-B]PYRIDINE 6-CHLORO-1H-PYRROLO[2,3-B]PYRIDINE 55052-27-2 C7H5ClN2
4-Methoxypyridine 4-Methoxypyridine 620-08-6 C6H7NO
5-Isoquinolinesulfonic acid 5-Isoquinolinesulfonic acid 27655-40-9 C9H7NO3S
2-Methoxy-5-nitropyridine 2-Methoxy-5-nitropyridine 5446-92-4 C6H6N2O3
1-(4-Pyridyl)piperazine 1-(4-Pyridyl)piperazine 1008-91-9 C9H13N3
4-Bromoquinoline 4-Bromoquinoline 3964-04-3 C9H6BrN
3,4-Dihydro-7-(4-bromobutoxy)-2(1H)-quinolinone 3,4-Dihydro-7-(4-bromobutoxy)-2(1H)-quinolinone 129722-34-5 C13H16BrNO2
Benzoyleneurea Benzoyleneurea 86-96-4 C8H6N2O2
8-Nitroquinoline 8-Nitroquinoline 607-35-2 C9H6N2O2
4-chloro-6,7-dimethoxyquinoline 4-chloro-6,7-dimethoxyquinoline 35654-56-9 C11H10ClNO2
3-Pyridylboronic acid 3-Pyridylboronic acid 1692-25-7 C5H6BNO2
8-Hydroxyquinoline-N-oxide 8-Hydroxyquinoline-N-oxide 1127-45-3 C9H7NO2
2-Chloro-6-methyl-3-quinolinecarbaldehyde 2-Chloro-6-methyl-3-quinolinecarbaldehyde 73568-27-1 C11H8ClNO
5-Hydroxyisoquinoline 5-Hydroxyisoquinoline 2439-04-5 C9H7NO
Methyl 3-isoquinolinecarboxylate Methyl 3-isoquinolinecarboxylate 27104-73-0 C11H9NO2
4-N-BOC-Aminopiperidine 4-N-BOC-Aminopiperidine 73874-95-0 C10H20N2O2
2-Methylquinoxaline 2-Methylquinoxaline 7251-61-8 C9H8N2
2-Bromonicotinic acid 2-Bromonicotinic acid 35905-85-2 C6H4BrNO2
3-Methyl-2-thiophenecarboxylic acid 3-Methyl-2-thiophenecarboxylic acid 23806-24-8 C6H6O2S
5-Amino-2-methoxypyridine 5-Amino-2-methoxypyridine 6628-77-9 C6H8N2O
Thieno[3,2-b]thiophene Thieno[3,2-b]thiophene 251-41-2 C6H4S2
5,7-DIBROMO-8-HYDROXYQUINOLINE 5,7-DIBROMO-8-HYDROXYQUINOLINE 521-74-4 C9H5Br2NO
(R)-(-)-2-Methylpiperazine (R)-(-)-2-Methylpiperazine 75336-86-6 C5H12N2
2,6-Dichloro-3-nitropyridine 2,6-Dichloro-3-nitropyridine 16013-85-7 C5H2Cl2N2O2
5-BROMO-6-HYDROXYNICOTINIC ACID 5-BROMO-6-HYDROXYNICOTINIC ACID 41668-13-7 C6H4BrNO3
2-Hydroxypyridine 2-Hydroxypyridine 142-08-5 C5H5NO
3-Bromo-4-chloropyridine 3-Bromo-4-chloropyridine 36953-42-1 C5H3BrClN
3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine 151266-23-8 C5H4IN5
2,5-Dimethylpyridine 2,5-Dimethylpyridine 589-93-5 C7H9N
5-Amino-2-(trifluoromethyl)pyridine 5-Amino-2-(trifluoromethyl)pyridine 106877-33-2 C6H5F3N2
3-AMINO-6-METHYLPYRIDAZINE 3-AMINO-6-METHYLPYRIDAZINE 18591-82-7 C5H7N3
5-Chloro-3-nitropyridine-2-carbonitrile 5-Chloro-3-nitropyridine-2-carbonitrile 181123-11-5 C6H2ClN3O2
Pyrimidinetetramine sulfate Pyrimidinetetramine sulfate 5392-28-9 C4H10N6O4S
2,6-DIHYDROXYPYRIDINE HYDROCHLORIDE 2,6-DIHYDROXYPYRIDINE HYDROCHLORIDE 10357-84-3 C5H6ClNO2
2-Methoxy-3-(trifluoromethyl)pyridine 2-Methoxy-3-(trifluoromethyl)pyridine 121643-44-5 C7H6F3NO
1-Acetyl-4-piperidinecarboxylic acid 1-Acetyl-4-piperidinecarboxylic acid 25503-90-6 C8H13NO3
2-Trifluoromethyl-5-bromopyridine 2-Trifluoromethyl-5-bromopyridine 436799-32-5 C6H3BrF3N
2-Amino-5-bromo-6-methylpyridine 2-Amino-5-bromo-6-methylpyridine 42753-71-9 C6H7BrN2
4-CHLOROTHIENO[2,3-D]PYRIMIDINE 4-CHLOROTHIENO[2,3-D]PYRIMIDINE 14080-59-2 C6H3ClN2S
Isoquinolin-6-ol Isoquinolin-6-ol 7651-82-3 C9H7NO
2,5-Diamino-4,6-dihydroxy-pyrimidine 2,5-Diamino-4,6-dihydroxy-pyrimidine 40769-69-5 C4H6N4O2
3-(Trifluoromethyl)pyrid-2-ylhydrazine 3-(Trifluoromethyl)pyrid-2-ylhydrazine 89570-83-2 C6H6F3N3
Tetrahydrothiopyran-4-one Tetrahydrothiopyran-4-one 1072-72-6 C5H8OS
2,5,6-Tribromo-3-methylpyridine 2,5,6-Tribromo-3-methylpyridine 393516-82-0 C6H4Br3N
4-Ethylpyridine 4-Ethylpyridine 536-75-4 C7H9N
3,5-Dichloropyridine 3,5-Dichloropyridine 2457-47-8 C5H3Cl2N
2,4-Dimethoxyprimidine-5-boronic acid 2,4-Dimethoxyprimidine-5-boronic acid 89641-18-9 C6H9BN2O4
5-Chloropyrimidine 5-Chloropyrimidine 17180-94-8 C4H3ClN2
4-Chloro-3-fluoropyridine 4-Chloro-3-fluoropyridine 2546-56-7 C5H3ClFN
2-Amino-4,6-dimethoxypyrimidine 2-Amino-4,6-dimethoxypyrimidine 36315-01-2 C6H9N3O2
4-Pyridylcarbinol 4-Pyridylcarbinol 586-95-8 C6H7NO
3,5-Dichloro-2-cyanopyridine 3,5-Dichloro-2-cyanopyridine 85331-33-5 C6H2Cl2N2
2,5-Dibromo-3-octylthiophene 2,5-Dibromo-3-octylthiophene 149703-84-4 C12H18Br2S
2-Fluoro-5-nitropyridine 2-Fluoro-5-nitropyridine 456-24-6 C5H3FN2O2
5-Chloro-2-cyanopyridine 5-Chloro-2-cyanopyridine 89809-64-3 C6H3ClN2
5-Bromo-6-chloropyridin-3-amine 5-Bromo-6-chloropyridin-3-amine 130284-53-6 C5H4BrClN2
1-(5-Methyl-2-thienyl)ethan-1-one 1-(5-Methyl-2-thienyl)ethan-1-one 13679-74-8 C7H8OS
2-Amino-5-cyanopyridine 2-Amino-5-cyanopyridine 4214-73-7 C6H5N3
2-Chloro-5-trichloromethylpyridine 2-Chloro-5-trichloromethylpyridine 69045-78-9 C6H3Cl4N
2-(Trifluoromethyl)nicotinic acid 2-(Trifluoromethyl)nicotinic acid 131747-43-8 C7H4F3NO2
2-CHLOROLEPIDINE 2-CHLOROLEPIDINE 634-47-9 C10H8ClN
3-Aminoquinoline 3-Aminoquinoline 580-17-6 C9H8N2
2-Thiophenecarbonitrile 2-Thiophenecarbonitrile 1003-31-2 C5H3NS
Nitroxoline Nitroxoline 4008-48-4 C9H6N2O3
2-Amino-3-(1,2-dihydro-2-oxoquinoline-4-yl)propanoic acid 2-Amino-3-(1,2-dihydro-2-oxoquinoline-4-yl)propanoic acid 5162-90-3 C12H12N2O3
Methyl 6-methylnicotinate Methyl 6-methylnicotinate 5470-70-2 C8H9NO2
2,4-Dichloroquinazoline 2,4-Dichloroquinazoline 607-68-1 C8H4Cl2N2
6-BROMO-2(1H)-QUINOLONE 6-BROMO-2(1H)-QUINOLONE 1810-66-8 C9H6BrNO
Isoquinoline-1-carboxylic acid Isoquinoline-1-carboxylic acid 486-73-7 C10H7NO2
HomePage | Member Companies | Advertising | Contact us | Previous WebSite | MSDS | CAS Index | CAS DataBase
Copyright © 2016 ChemicalBook All rights reserved.
凤翔县| 招远市| 涞源县| 贡嘎县| 南宁市| 苏尼特左旗| 广州市| 佛坪县| 太康县| 和静县| 安溪县| 南充市| 广安市| 伊宁县| 铁岭市| 伊金霍洛旗| 浠水县| 丹寨县| 昌吉市| 彭水| 福建省| 永定县| 蓬安县| 上高县| 赣州市| 浦城县| 渑池县| 南乐县| 获嘉县| 丰镇市| 波密县| 商河县| 青冈县| 勃利县| 永德县| 中方县| 随州市| 汪清县| 九龙坡区| 罗江县| 汽车|