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

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List CHRYSOERIOL
491-71-4

CHRYSOERIOL synthesis

4synthesis methods
-

Yield:491-71-4 90%

Reaction Conditions:

with hydrogenchloride in tetrahydrofuran;water at 20; for 3 h;Inert atmosphere;

Steps:

1 Synthesis of 5,7-dihydroxyflavones 4f-h
General procedure: A diluted solution of hydrochloric acid (20 %, 10 mL) was added to a suspension of the appropriated polyalkoxyflavones 10b-d (0.27 mmol) in tetrahydrofuran (5 mL). The reaction was stirred under nitrogen at room temperature for 3 h. After this period the reaction was poured into ice (100 g) and water (50 mL). The solid so obtained was filtered, washed abundantly with water (150 mL) and diethyl ether (50 mL) affording the expected 5,7-dihydroxyflavones 4f-h as light yellow solids in good yields: 4f, 90%, 73mg; 4g, 89%, 70mg; 4h, 86%, 73mg.

References:

Ribeiro, Daniela;Freitas, Marisa;Tomé, Sara M.;Silva, Artur M. S.;Porto, Gra?a;Fernandes, Eduarda [European Journal of Medicinal Chemistry,2013,vol. 67,p. 280 - 292]

FullText

CHRYSOERIOL Related Search:

潮安县| 丰顺县| 杭州市| 舞阳县| 七台河市| 永康市| 华蓥市| 依兰县| 延庆县| 江山市| 长宁区| 泸溪县| 邛崃市| 察隅县| 靖安县| 勃利县| 且末县| 新竹县| 乌恰县| 耒阳市| 开封市| 关岭| 马龙县| 罗甸县| 弥勒县| 兴仁县| 卫辉市| 阿拉尔市| 叶城县| 孝昌县| 时尚| 德阳市| 南开区| 上蔡县| 油尖旺区| 祁连县| 井研县| 收藏| 兴宁市| 西宁市| 芮城县|