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 4-Mercapto-2-butanone
34619-12-0

4-Mercapto-2-butanone synthesis

3synthesis methods
By reduction of 4-bromo-2-butanone with NaHS; by reacting methyl vinyl ketone with hydrogen sulfide; from methyl vinyl ketone and thioacetamide; from methyl vinyl ketone and hydrogen sulfide at 12 to 15°C by patented process.
-

Yield: 75%

Reaction Conditions:

with hydrogen sulfide in methanol at 20; for 1 h;Inert atmosphere;

Steps:

2
1.0 mL of methylbenzylamine starch catalyst (DS = 0.35) and 20 mL of methanol were added to a 100 mL four-necked flask. After stirring for 30 min, the mixture was cooled to 20 ° C and then passed to the reaction solution. (5g dilution to 20mL); after a period of time, the samples were subjected to liquid phase, liquid quality and temperament analysis until the liquid phase test showed that the separated liquid was separated from each other by adding a solution of hydrogen peroxide (0.4 L / h) After the product content is no longer changed, stop the introduction of hydrogen sulfide gas, nitrogen, and then the reaction solution, the filtrate under vacuum distillation, collecting the boiling point of 75-77 ° C products. The results showed that the conversion of methyl vinyl ketone could reach 85%, the selectivity of methyl mercaptoethyl ketone was 93%, and the yield was 75%.

References:

CHAMBROAD CHEMICAL INDUSTRY RESEARCH INSTITUTE CO.,LTD;Yi, Xianjun;Cheng, Zhen;Liu, JinZhang;Zhang, Jianlin;Yao, Gang;Ma, Yunsheng CN104276987, 2016, B Location in patent:Paragraph 0042-0043

4-Mercapto-2-butanone Related Search:

石家庄市| 临猗县| 宁城县| 柘城县| 肇州县| 开平市| 南和县| 长汀县| 辉南县| 柘荣县| 垣曲县| 宜州市| 六枝特区| 肇源县| 平安县| 左云县| 乐清市| 泉州市| 旬阳县| 乐都县| 砀山县| 泰兴市| 措美县| 博白县| 荆门市| 永吉县| 木里| 荃湾区| 海口市| 临清市| 蚌埠市| 香港 | 福海县| 肃南| 商洛市| 扎鲁特旗| 德清县| 淅川县| 常熟市| 平南县| 清流县|