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 Piracetam
7491-74-9

Piracetam synthesis

10synthesis methods
Prepared by condensing 2-pyrrolidinone with ethyl chloroacetate in the presence of a metal hydride and then converting the ester into an amide with ammonia.
-

Yield:7491-74-9 45.94%

Reaction Conditions:

with ammonia in methanol at 60; for 4 h;

Steps:

69 Synthesis of compound 69.3.

Mixture of compound 69.2 (4.5g, 28.66mmol, 1.0eq) and methanolic ammonia (50ml) was stirred at 60°C for 4h. After completion of reaction, reaction mixture was concentrated under reduced pressure and triturated with diethyl ether to obtain 69.3. (1.87g, Yield: 45.94%). MS(ES): m/z 143.08 [M+H] +.

References:

WO2020/112937,2020,A1 Location in patent:Paragraph 00766-00767

Piracetam Related Search:

九江县| 东乌珠穆沁旗| 贡嘎县| 武汉市| 襄垣县| 岚皋县| 前郭尔| 花莲市| 沁源县| 年辖:市辖区| 扬州市| 喀喇| 全椒县| 萍乡市| 德安县| 高邮市| 阿克苏市| 克拉玛依市| 浮山县| 沈阳市| 平舆县| 论坛| 蕲春县| 肇庆市| 九寨沟县| 达尔| 兰坪| 固阳县| 双柏县| 托克逊县| 肥西县| 灵璧县| 永修县| 库伦旗| 九台市| 巨野县| 永川市| 鞍山市| 嘉黎县| 清水县| 兴安盟|