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 2-Bromo-9-fluorenone
3096-56-8

2-Bromo-9-fluorenone synthesis

12synthesis methods
The synthesis of 2-Bromo-9-fluorenone is as follows:the 9-fluorenone (10mmol), the phase transfer catalyst (1.5mmol fourteen alkyl trimethyl ammonium chloride) and brominated aqueous ammonium solution (30 wt %, 25mmol ammonium bromide) mixing and heating system temperature to 75 °C, in 1h is divided into three time 11mmol potassium bromate, to three times the weight ratio of 1:3:1, to maintain the system temperature to continue reaction 3h, wherein the 9-fluorenone, ammonium bromide, the molar ratio of potassium bromate 1 : 2.5: 1.1 ; 9-fluorenone, and fourteen alkyl trimethyl ammonium chloride (phase-transfer catalyst) molar ratio of 1 : 0.15; 2) after the reaction, to room temperature, by adding 20% aqueous solution of sodium sulfite ( eliminates the bromine fluid ), is filtered, the filter cake washing water And dried to obtain yellow solid of 2-Bromo-9-fluorenone, the yield is 99.2%.
3096-56-8.png
-

Yield:3096-56-8 99.2%

Reaction Conditions:

with potassium bromate;tetra-n-butyl-ammonium chloride;ammonium bromide in lithium hydroxide monohydrate at 75; for 6 h;Temperature;

Steps:

3 Embodiment 3 2-bromo-9-fluorenone, synthetic method, comprising the following steps:

1) the 9-fluorenone (10mmol), the phase transfer catalyst (1.5mmol fourteen alkyl trimethyl ammonium chloride) and brominated aqueous ammonium solution (30 wt %, 25mmol ammonium bromide) mixing and heating system temperature to 75 °C, in 1h is divided into three time 11mmol potassium bromate, to three times the weight ratio of 1:3:1, to maintain the system temperature to continue reaction 3h, wherein the 9-fluorenone, ammonium bromide, the molar ratio of potassium bromate 1 : 2.5: 1.1 ; 9-fluorenone, and fourteen alkyl trimethyl ammonium chloride (phase-transfer catalyst) molar ratio of 1 : 0.15; 2) after the reaction, to room temperature, by adding 20% aqueous solution of sodium sulfite ( eliminates the bromine fluid ), is filtered, the filter cake washing water And dried to obtain yellow solid of 2-bromo-9-fluorenone, the yield is 99.2%.

References:

CN104774141,2016,B Location in patent:Paragraph 0032-0036

2-Bromo-9-fluorenone Related Search:

周宁县| 宝鸡市| 定西市| 富民县| 安丘市| 巴林右旗| 沐川县| 修文县| 靖江市| 沙雅县| 凌云县| 廊坊市| 荃湾区| 龙岩市| 湘乡市| 张掖市| 通榆县| 富顺县| 佛教| 神农架林区| 宁强县| 兴安县| 衡阳县| 乌拉特前旗| 隆安县| 威海市| 蓬溪县| 龙里县| 鹤峰县| 临沭县| 垣曲县| 道孚县| 九龙坡区| 左贡县| 安塞县| 新竹县| 延津县| 娱乐| 玛纳斯县| 花莲县| 宜兴市|