Method for Preparing Branched Functionalized Polymers Using Branched Polyol Cores
申请人:McManus P. Samuel
公开号:US20070031371A1
公开(公告)日:2007-02-08
A method of preparing a multiarm polymer includes reacting a branched polyol with one or more functionalizing reagents to effect substitution of an ionizable functional group or a protected ionizable functional group, Y, to form a mixture comprising (i) unsubstituted branched polyol containing no Y groups; (ii) a monosubstituted polyol comprising one Y group, and (iii) a multisubstituted polyol (e.g., a disubstituted polyol comprising two Y groups); followed by purifying the mixture to separate the monosubstituted polyol from other species Thereafter, a water-soluble and non-peptidic polymer segment is attached to the monosubstituted branched polyol at the site of at least one of the hydroxyl groups. The invention also provides purified monosubstituted branched polyols and multiarm polymers prepared by the method and polyol precursors for use in the method.
US8568705B2
申请人:——
公开号:US8568705B2
公开(公告)日:2013-10-29
Jullien, Ludovic; Canceill, Josette; Lacombe, Liliane, Journal of the Chemical Society. Perkin transactions II, 1994, # 5, p. 989 - 1002
作者:Jullien, Ludovic、Canceill, Josette、Lacombe, Liliane、Lehn, Jean-Marie
DOI:——
日期:——
Gold(I)-Catalyzed Synthesis of Unsymmetrical Ethers Using Alcohols as Alkylating Reagents
microwave‐irradiated alcohol‐protecting strategy based on goldcatalysis utilizing benzyl alcohol, tert‐butyl alcohol and triphenylmethanol as alkylating reagents has been developed. This protecting strategy has wide functional group tolerance with satisfactory yields for the majority of the selected alcohols. The mechanism of this transformation was probed with oxygen‐18 isotope labelled alcohols assisted by