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 L-Tyrosine Ethyl Ester Hydrochloride
4089-07-0

L-Tyrosine Ethyl Ester Hydrochloride synthesis

3synthesis methods
synthesis of L-Tyrosine Ethyl Ester Hydrochloride: Esterification of 25 g. ol L-tyrosine (0.014 mole) with ethanolic hydrogen chloride gave 24.1 g. of L-tyrosine ethyl ester hydrochloride (80%). Liberation of the ester by slurrying the hydrochloride in chloroform rollowed by the addition of chloroform saturated with ammonia, removal of the ammonium chloride by filtration and evaporation of the chloroform gave 19.4 g. of L-tyrosine ethyl ester (67%), m.p. 106-108 ° .
-

Yield:4089-07-0 94.7%

Reaction Conditions:

with dichloro sulfoxideReflux;

Steps:

2

Weigh 18g of L-Tyr (tyrosine) and 100ml of ethanol into the reaction flask, add 120ml of SOCl2 (thionyl chloride) dropwise with stirring, and react under reflux. When TLC (Thin Layer Chromatography) detects that there is no L-Tyr (tyrosine) in the reaction system, the reaction is completed, and the reaction solution after the above reaction is vacuum concentrated to a volume of 20 ml, and 100 ml of petroleum ether is added to precipitate a white solid. After centrifugation and drying, 19.8 g of white solid was obtained with a yield of 94.7%.

References:

CN112094204,2020,A Location in patent:Paragraph 0057-0058

L-Tyrosine Ethyl Ester Hydrochloride Related Search:

南京市| 大同县| 红安县| 丰原市| 清水河县| 临澧县| 扶绥县| 宜川县| 安多县| 江西省| 宁武县| 乐东| 炎陵县| 莫力| 得荣县| 方正县| 沾益县| 沂源县| 丹寨县| 柏乡县| 内乡县| 滁州市| 施秉县| 文昌市| 莒南县| 乳山市| 安仁县| 开阳县| 上蔡县| 三门峡市| 虞城县| 沾化县| 西华县| 苗栗县| 增城市| 洪泽县| 宽城| 宜宾县| 嵊州市| 中超| 若羌县|