| http://www.w3.org/ns/prov#value | - The methods include reacting a polyalkylene oxide such as polyethylene glycol with a t-butyl haloacetate in the presence of a base followed by treatment with an acid such as trifluoroacetic acid....http://www.google.com/patents/US5681567?utm_source=gb-gplus-sharePatent US5681567 - Method of preparing polyalkylene oxide carboxylic acidsAdvanced Patent SearchPublication numberUS5681567 APublication
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