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 Levonorgestrel
797-63-7

Levonorgestrel synthesis

10synthesis methods
-

Yield:797-63-7 84.6%

Reaction Conditions:

with sulfuric acid;water in tetrahydrofuran at 65 - 68;

Steps:

Example 2 Preparation of Levonorgestrel (3)

A solution of 10 g of dienol ether (2) in 120 ml of tetrahydrofuran was treated with 45 ml of 20% v/v sulphuric acid solution.
The mixture was stirred at 65-68° C. for 1-2 hours.
After completion of reaction, the reaction mass was cooled to 20-30° C. and 50 ml of DM water was added.
The solid precipitated was filtered and slurried in 50 ml of water.
23% aqueous ammonia solution was added till pH of the mixture was 7 to 8.
The mixture was stirred, filtered and the wet cake was washed with water and suck dried under vacuum to obtain white solid.

References:

US2013/324748,2013,A1 Location in patent:Paragraph 0048

Levonorgestrel Related Search:

泌阳县| 中超| 准格尔旗| 侯马市| 文山县| 绩溪县| 措美县| 陈巴尔虎旗| 永平县| 绿春县| 古蔺县| 泸定县| 新疆| 多伦县| 广汉市| 蕲春县| 红原县| 鹿泉市| 武威市| 铁岭市| 额敏县| 桐城市| 榆林市| 连平县| 岢岚县| 贵定县| 荥经县| 偏关县| 汨罗市| 鹤庆县| 马山县| 宁陵县| 西畴县| 轮台县| 汶上县| 裕民县| 宝兴县| 乃东县| 龙里县| 江城| 恩平市|