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利用Lewis酸三氟甲磺酸镱(Yb(OTf)3)调控(S)-N-(2-羟基-1-苯乙基)甲基丙烯酰胺((S)-HPEMA)和(S)-N-(2-羟基-1-苯乙基)丙烯酰胺((S)-HPEA)的自由基聚合,得到相应的光学活性聚合物;研究了反应条件对聚合物立体结构的影响,发现以甲醇和正丁醇为溶剂时,Yb(OTf)3的存在可显著提高聚合物的mm三元组的含量,而以DMSO为溶剂时,Yb(OTf)3对聚合物的立构规整性没有明显改变;通过1H-NMR研究了Yb(OTf)3与单体之间的相互作用,结果表明单体的酰胺基团与Lewis酸的稀土金属离子间的配位以及单体的羟基与Lewis酸的三氟甲磺酸根间的氢键影响了单体的加成方向和聚合物的立体结构.
(S) -HPEMA) and (S) - (2-hydroxy-1-phenylethyl) methacrylamide were inhibited by the Lewis acid ytterbium triflate (Yb (OTf) Free radical polymerization of N- (2-hydroxy-1-phenylethyl) acrylamide ((S) -HPEA) to obtain the corresponding optically active polymer. The effect of reaction conditions on the stereostructure of the polymer was investigated. The presence of Yb (OTf) 3 in the presence of n-butanol as a solvent significantly increased the mm-triphenylene content of the polymer, whereas there was no significant change in the tacticity of the polymer for Yb (OTf) 3 with DMSO The interaction between the monomer Yb (OTf) 3 and the monomer was studied by 1H-NMR. The results showed that the coordination between the amide group of the monomer and the rare earth metal ion of the Lewis acid and the hydroxyl group of the monomer with the tris The hydrogen bonding between fluoromethanesulfonate affects the monomer addition direction and the three-dimensional structure of the polymer.