成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

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 Pentaethylene Glycol Dimethanesulfonate
109789-39-1

Pentaethylene Glycol Dimethanesulfonate synthesis

1synthesis methods
-

Yield:109789-39-1 100%

Reaction Conditions:

with triethylamine in dichloromethane at 20; for 22 h;

Steps:

1

MsCl (10.5 mL, 134.44 mmol) was added dropwise to a stirred solution of PEG5-di-OH (12.8 g, 52.64 mmol) and triethylamine (22 mL, 157.02 mmol) in dichloromethane (100 mL) at 00C. After addition, the resulting solution was stirred at room temperature for 22 hours. Water (10 mL) was added to quench the reaction and some saturated NaCl solution (~30 mL) was added. The organic phase was separated and washed with brine (3 x 100 mL), dried over Na2SO4, and concentrated. The residue was dried under high vacuum to afford the product as an oil in quantitative yield. 1H-NMR (CDCl3) 4.38-4.35 (m, 4 H, 2 CH2), 3.76- 3.73 (m, 4 H, 2 CH2), 3.67-3.62 (m, 12 H, 6 CH2), 3.12 (s, 6 H, 2 CH3).

References:

WO2009/54916,2009,A2 Location in patent:Page/Page column 49