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 Coumarin 343
55804-65-4

Coumarin 343 synthesis

9synthesis methods
-

Yield: 85%

Reaction Conditions:

with hydrogenchloride;water at 25; for 24 h;

Steps:


A solution of 3 (2.0 g, 6.38 mmol) in concentrated HCl solution(20 mL) was stirred at 25 °C for 24 h. After the reaction was completed,water (100 mL) was added to the solution. The mixture was extractedby ethyl acetate (50 mL) for three times, the combined organic layerwas washed by H2O (50 mL) and brine, dried over anhydrous Na2SO4and concentered under reduced pressure to afford compound 4 as orangesolid (1.55 g, 85%), mp 223-225 °C, 1H NMR (400 MHz DMSO-d6) δ 12.20 (bs, 1H), 8.46 (s, 1H), 7.24 (s, 1H), 2.72 (dd,J=13.2, 6.8 Hz, 4H), 2.51-2.50 (m, 4H), 1.95-1.81 (m, 4H).

References:

Ismail, Ismail;Wang, Dawei;Wang, Zhenghua;Wang, Dan;Zhang, Changyu;Yi, Long;Xi, Zhen [Dyes and Pigments,2019,vol. 163,p. 700 - 706]

Coumarin 343 Related Search:

永泰县| 荥阳市| 时尚| 电白县| 阿勒泰市| 青岛市| 泾川县| 峨山| 喀什市| 普兰县| 北票市| 金坛市| 余干县| 廉江市| 偃师市| 绍兴市| 孟村| 丹棱县| 璧山县| 宁德市| 娱乐| 玉树县| 卫辉市| 镶黄旗| 鲁甸县| 谷城县| 保定市| 易门县| 柘荣县| 志丹县| 新野县| 伊宁市| 南丰县| 白沙| 柘荣县| 宽甸| 瑞安市| 灵山县| 棋牌| 舞钢市| 宁南县|