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 4,4'-DIBROMOOCTAFLUOROBIPHENYL
10386-84-2

4,4'-DIBROMOOCTAFLUOROBIPHENYL synthesis

3synthesis methods
-

Yield:10386-84-2 92.3%

Reaction Conditions:

Stage #1:1,4-dibromotetrafluorobenzene with magnesium;ethylene dibromide in tetrahydrofuran at 20; for 6.25 h;Inert atmosphere;
Stage #2: with (4-bromophenyl)magnesium bromide;copper(l) chloride in tetrahydrofuran at 10 - 15; for 3 h;Reagent/catalyst;Solvent;Temperature;

Steps:

1-7 Example 7
Add 5.35 g of fresh magnesium chips, 60 g of anhydrous tetrahydrofuran, nitrogen protection, stirring at room temperature into a 250 ml reaction flask, add 0.2 g of dibromoethane with a syringe, stir for 15 minutes, and slowly add 61.57 g of A mixed solution of 2,3,5,6-tetrafluoro-1,4-dibromobenzene and 60 grams of anhydrous tetrahydrofuran, after the dripping is completed, stir and react at room temperature for 6 hours to obtain 2,3,5,6-tetrafluoro-4-bromobenzene Base magnesium bromide solution, set aside.Take another 500 ml reaction flask, add 23.75 g cuprous chloride and 100 g anhydrous tetrahydrofuran, turn on the stirring, control the temperature of the system (10-15) , and add dropwise the prepared 2,3,5,6-tetrafluoro- After the addition of 4-bromophenyl magnesium bromide solution is completed, the reaction is stirred at (10-15)°C for 3 hours. The reaction solution was diluted to 150 g of 10percent hydrochloric acid solution, extracted twice with ethyl acetate, and the organic phases were combined, dried over anhydrous sodium sulfate and concentrated to remove the solvent. The residue was decolorized by activated carbon and recrystallized to obtain a white solid 42.08 Gram is 2,2',3,3',5,5',6,6'-octafluoro-4,4'-dibromobiphenyl, the yield is 92.3percent, and the purity is 99.3percent.

References:

Zhejiang Zhongxinfucai Co., Ltd.;Yuan Qiliang;Chen Haifeng;Xie Bowen;Xu Pengfei;Chen Yinhao;Wang Chao CN111393256, 2020, A Location in patent:Paragraph 0012; 0027-0047

FullText

4,4'-DIBROMOOCTAFLUOROBIPHENYL Related Search:

泽库县| 怀化市| 康马县| 盈江县| 家居| 临江市| 南京市| 吴江市| 临海市| 丹东市| 台北县| 涟源市| 宁晋县| 保靖县| 枣强县| 平果县| 阳谷县| 长乐市| 秦皇岛市| 团风县| 吴旗县| 麻栗坡县| 分宜县| 且末县| 宜黄县| 吉木乃县| 靖西县| 合阳县| 泗阳县| 胶南市| 明溪县| 庆安县| 青浦区| 五河县| 安徽省| 无为县| 朝阳区| 本溪市| 姚安县| 柘城县| 通化市|