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 BISPHENOL A DIGLYCIDYL ETHER RESIN
1675-54-3

BISPHENOL A DIGLYCIDYL ETHER RESIN synthesis

1synthesis methods
The synthesis of the basic epoxy resin molecule involves the reaction of epichlorohydrin with bisphenol A, the latter requiring two basic intermediates for synthesis, acetone and phenol. Theoretically, the production of the bisphenol A diglycidyl ether requires 2 mol of epichlorohydrin for each mole of the phenol. Epoxy resins of higher molecular weight are obtained by reducing the epichlorohydrin/bisphenol A ratio. This reaction involves consumption of the initial epoxy groups in the epichlorohydrin and of some of the groups formed by dehydrohalogenation.
-

Yield:1675-54-3 72%

Reaction Conditions:

Stage #1:BPA with sodium hydride in N,N-dimethyl-formamide at 20; for 0.25 h;Inert atmosphere;
Stage #2:epichlorohydrin in N,N-dimethyl-formamide at 20; for 18 h;

Steps:

7
A round-bottomed flask was charged sequentially with NaH (200 mg, 4.80 mmol, 2.2 equiv) and bisphenol A (500 mg, 2.18 mmol, 1 equiv), and the contents were placed under an atmosphere of argon. Anhydrous dimethyl formamide (5 mL) was introduced via syringe and the resulting mixture was stirred at room temperature. After 15 min, racemic epichlorohydrin (700 μL, 8.96 mmol, 4.1 equiv) was added via syringe and the mixture was allowed to react at room temperature for 18 h. Then, the solution was quenched with deionized water (~ 1 mL) and the mixture was extracted with ethyl acetate (3 x 4 mL). The organic layer was washed with deionized water (2 mL), was dried over anhydrous magnesium sulfate, was filtered, and was concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel (eluent: dichloromethane) to provide racemic BADGE (536 mg, 72%) as a white foamy residue. 1H NMR (400 MHz, DMS(W6): δ 7.10 (d, J= 8.8, 4H), 6.84 (d, J= 8.8, 4H), 4.25 (dd, J = 11.6, 2.8, 2H), 3.78 (dd, J= 11.2, 6.4, 2H), 3.29 (m, 2H), 2.81 (t, J= 4.8, 2H), 2.68 (m, 2H), 1.60 (s, 6H). 13C NMR (100 MHz, DMSO-J6): δ 156.6, 143.5, 128.0, 114.5, 69.5, 50.3, 44.4, 41.8, 31.3. TLC (5% methanol in dichloromethane), R/ 0.77 (UV, p- anisaldehyde).

References:

BRITISH COLUMBIA CANCER AGENCY BRANCH;THE UNIVERSITY OF BRITISH COLUMBIA;SADAR, Marianne, D.;MAWJI, Nasrin, R.;WANG, Jun;ANDERSEN, Raymond, J.;WILLIAMS, David, E.;LEBLANC, Mike WO2010/66, 2010, A1 Location in patent:Page/Page column 77-78

FullText

BISPHENOL A DIGLYCIDYL ETHER RESIN Related Search:

车险| 什邡市| 得荣县| 长治县| 遂溪县| 柳州市| 钟山县| 蚌埠市| 布尔津县| 墨脱县| 东乌珠穆沁旗| 开远市| 盐山县| 桓仁| 辽宁省| 巢湖市| 兴业县| 伊吾县| 遂溪县| 乌兰县| 廊坊市| 鄂温| 灯塔市| 永安市| 龙游县| 淮阳县| 虞城县| 兖州市| 息烽县| 凭祥市| 出国| 个旧市| 陈巴尔虎旗| 卢龙县| 乐山市| 巧家县| 浦县| 丰原市| 错那县| 临湘市| 西乌珠穆沁旗|