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 PEG4-acid
518044-49-0

PEG4-acid synthesis

1synthesis methods
-

Yield:-

Reaction Conditions:

with trifluoroacetic acid in 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran

Steps:

16 3-{2-[2-(2-Hydroxyethoxy)ethoxy]ethoxy}propanoic acid
3-{2-[2-(2-Hydroxyethoxy)ethoxy]ethoxy}propanoic acid To a solution of 300 mg (1.08 mmol) of tert-butyl 12-hydroxy-4,7,10-trioxadodecanoate in 6 ml of DCM are added 1.6 ml (21.56 mmol) of TFA. Stirring is continued at RT for 3 hours. The mixture is concentrated to dryness, taken up in a minimum amount of DCM and entrained several times with toluene to give compound 50 in the form of a pale yellow oil (240 mg, quantitative).

References:

SANOFI US2012/225089, 2012, A1

PEG4-acid Related Search: