天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
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 1,4-Dimethoxybenzene
150-78-7

1,4-Dimethoxybenzene synthesis

15synthesis methods
By methylation of hydroquinone using dimethyl sulfate and alkali.
-

Yield:150-78-7 97%

Reaction Conditions:

with potassium hydroxide in dimethyl sulfoxide at 25; for 1 h;

Steps:

3.1

Example 3.1; Synthesis of 1,4-dimethoxybenzene; Iodomethane (4.98 ml, 9.99 mmol) was added dropwise to a solution of hydroquinone (4.00 g, 36.33 mmol) and KOH (8.32 g, 148.30 mmol) in 75 ml of DMSO. The reaction mixture became dark and was stirred at r.t. for 1 h at 25°C. The reaction mixture was neutralized by adding an aqueous saturated solution OfNH4Cl. The product was extracted with dichloromethane (3 x 50 mL). The organic phases were washed several times with water (5 x 150 mL) to eliminate DMSO, then dried over anhydrous Na2SO4. The solvent was evaporated at reduced pressure. A white solid was isolated (4.87 g, yield 97%).

References:

WO2008/96239,2008,A1 Location in patent:Page/Page column 28

1,4-Dimethoxybenzene Related Search: