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 Ethylmagnesium bromide
925-90-6

Ethylmagnesium bromide synthesis

8synthesis methods
Ethylmagnesium bromide is commercially available, usually as a solution in diethyl ether or tetrahydrofuran. It may be prepared in the normal manner of Grignard reagents — by reacting bromoethane with magnesium in diethyl ether:
EtBr + Mg → EtMgBr
-

Yield:925-90-6 96%

Reaction Conditions:

with magnesium in diethyl ether at 25; under 5171.62 Torr;Inert atmosphere;Flow reactor;Solvent;Concentration;

Steps:

1.2.3. Grignard reagents (RMgX)

General procedure: Bromoethane (3.336 g, 2.28 mL, 30.00 mmol, 1 equiv) is dissolved in THF (22.7 mL) in a flask under argon. The organohalide 1.2 M solution is flowed through activated magnesium (chips/powder 1:1 wt %, 1.49 g, 60 mmol, 2 equiv) with BPR (100 psi) at 0.5 mL/min and 25 °C (Figure S1). After ≈4 min, the outcome solution is collected in a vial containing 2-hydroxybenzaldehyde phenylhydrazone (20-40 mg). When the yellow color solution turns orange, Grignard reagent solution is collected in a flask under argon. When the starting material solution is consumed, organomagnesium collection is maintained during 4 min (≈2-fold the residence time), pumping THF at 0.5 mL/min, yielding 90% of ethylmagnesium bromide as clear 1.08 M solution (≈20 mL, the yield is calculated in a steady state because the discarded volume of head and tail solution is constant, independently of the volume of organohalide solution converted). The concentration determination with 2-hydroxybenzaldehyde phenylhydrazone (82.3 mg, 0.38 mmol) dissolved in THF (1 mL) consumed 0.37 mL of EtMgBr corresponding to 1.03 M. The concentration determination with benzoic acid (46.2 mg, 0.37 mmol) and 4-(phenylazo)diphenylamine (indicator) dissolved in THF (1 mL) consumed 0.33 mL of EtMgBr corresponding to 1.12 M.

References:

Adamo, Andrea;Berton, Mateo;McQuade, D. Tyler;Sheehan, Kevin [Beilstein Journal of Organic Chemistry,2020,vol. 16,p. 1343 - 1356] Location in patent:supporting information

Ethylmagnesium bromide Related Search:

玉山县| 赞皇县| 正定县| 青铜峡市| 西充县| 长泰县| 九江市| 夏邑县| 东乌珠穆沁旗| 金山区| 基隆市| 六安市| 石景山区| 绥江县| 临泉县| 孝义市| 泰和县| 比如县| 洛浦县| 保定市| 江都市| 太湖县| 临沂市| 阳信县| 宜阳县| 津市市| 岐山县| 乐业县| 雅江县| 溆浦县| 盘锦市| 芮城县| 理塘县| 松滋市| 社旗县| 修武县| 奉化市| 石家庄市| 台湾省| 常德市| 柳河县|