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 Pentacene
135-48-8

Pentacene synthesis

4synthesis methods
-

Yield:135-48-8 54%

Reaction Conditions:

with lithium aluminium tetrahydride in tetrahydrofuran for 0.5 h;Inert atmosphere;Cooling with ice;

Steps:

16
Phthalaldehyde (4.02g, 30mmol) and 1,4-cyclohexanedione (1.68g, 15.0mmol) were dissolved in absolute ethanol, stirred evenly and added with NaOH aqueous solution (15mL, 15%), the reaction system immediately changed Into tan.The reactant was stirred at 60°C for 4 hours. After the reaction was completed, it was cooled to room temperature. The solid was filtered and washed with acetone until the filtrate was colorless to obtain 3.95 g of a yellow solid product of 6,13-pentacenequinone with a yield of 85%. Grind the product into powder for later use.Under the protection of nitrogen, add 6,13-pentacenequinone (2.0g, 6.5mmol) and dry tetrahydrofuran 100mL to the dried vial, and quickly add LiAlH4(0.98g, 25mmol)under ice bath conditionsThe solid powder is gradually returned to room temperature under stirring and the suspension is heated to reflux for 30 min.Then the system was cooled to room temperature, and then the hydrochloric acid solution was slowly added under the ice-salt bath. After the addition was completed, the system was heated and refluxed for 3 hours after no gas was generated.After the reaction, the precipitate was filtered, and the filter cake was washed with deionized water (2×30mL), dichloromethane (2×30mL), methanol (2×30mL) and ether (2×30mL) successively, and the remaining after drying The solid repeats the above steps again, and finally a dark blue solid powder of pentacene is obtained with a yield of 54%.In the pressure bottle, add 27.8g pentacene (0.1mol), 43g vinylene carbonate (0.5mol), and react at 220°C for 24h.Cool to room temperature and methanol precipitation to obtain the addition product.The above product was dissolved in 5 g of potassium hydroxide in ethanol, and reacted under reflux for 8 hours, washed and dried to obtain diol.The above product was dissolved in a mixture of 200 mL of dichloromethane and 8 mL of dimethyl sulfoxide, 12 mL of trifluoroacetic anhydride was added dropwise at -78°C, 25 mL of triethylamine was added dropwise after the reaction for 2 hours, and the reaction was continued for 2 hours with stirring. It was dried with sodium sulfate and recrystallized to obtain 22.0 g of product with a yield of 66%.

References:

Liaoning Aoke Chemical Co., Ltd.;Jiangsu Aoke Chemical Co., Ltd.;Zhu Jianmin;Gao Haiyang;Dong Zhenpeng;Liu Zhaobin;Gao Jie;Shi Junsheng CN111377827, 2020, A Location in patent:Paragraph 0155-0158

FullText

Pentacene Related Search:

丹东市| 海兴县| 梁山县| 丰原市| 石台县| 乐平市| 阜新市| 赤水市| 长海县| 乌苏市| 和硕县| 文成县| 吴旗县| 界首市| 横山县| 肥乡县| 德州市| 桐梓县| 奇台县| 龙江县| 明光市| 云梦县| 思南县| 拜城县| 桦甸市| 桐乡市| 厦门市| 双峰县| 定安县| 治县。| 新密市| 陆河县| 凤台县| 额济纳旗| 辉县市| 原阳县| 松滋市| 吉安县| 安达市| 贡山| 中方县|