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 3,4-DIFLUOROPHENETOLE
163848-46-2

3,4-DIFLUOROPHENETOLE synthesis

2synthesis methods
-

Yield:163848-46-2 92.1%

Reaction Conditions:

with tetramethlyammonium chloride;sodium hydroxide in water;N,N-dimethyl-formamide;toluene at 30;Reflux;Industrial scale;

Steps:

4 Preparation of 3,5-difluorophenyl ethyl ether

1000L reactor was charged with sodium hydroxide 40kg, 500kg toluene, 3,4-difluoro-phenol 100kg, Bi administered warmed to reflux trap by trap until no expulsion of water up to give 3,4-difluoro sodium phenoxide. Then cooling to 5kg tetramethylammonium chloride was added after 30 , DMF5kg, plus complete solution of bromoethane 90kg, dropping Albert warmed to reflux incubation reaction to the raw material disappears. After passing cooling to 30 , filtered and the filtrate washed twice 100kg of water was added, layers were separated and the organic layer is a toluene solution of 3,4-difluorophenyl ether. Recovered by distillation of toluene, and then the tower distillation, the product 3,4-difluorophenyl ether 112kg, GC content of> 99.9% and a yield of 92.1%

References:

CN104529723,2016,B Location in patent:Paragraph 0045-0047

3,4-DIFLUOROPHENETOLE Related Search:

全州县| 玉林市| 新津县| 叶城县| 凤凰县| 棋牌| 阿合奇县| 海城市| 江川县| 措美县| 谷城县| 大埔区| 双鸭山市| 惠州市| 古浪县| 新密市| 汉源县| 绥阳县| 滦南县| 海盐县| 盐山县| 彰武县| 本溪市| 镇远县| 合江县| 辽阳县| 吉林市| 澄城县| 金川县| 柳林县| 西畴县| 固阳县| 金沙县| 鄂托克前旗| 卢龙县| 丹江口市| 洛阳市| 大埔区| 永嘉县| 黄石市| 体育|