论文部分内容阅读
甲基丙烯酸三苯甲酯(TrMA)在不对称聚合中,当有手性配体鹰爪豆碱((—)-S_p)存在时,可形成具有单手螺旋链构象的旋光性聚合物。Vogt用TrMA的活性二聚体作引发剂,聚合TrMA,结果表明,右手螺旋链的聚甲基丙烯酸三苯甲酯(PTrMA)的主链上各不对称碳原子均为S型,而Okamoto借助色谱拆分PTrMA低聚物的方法得出了相反的结果,至于手性配体决定螺旋方向的原因则未见报道。本文从单体构象,配体(—)-S_p的构象及PTrMA活性端的烯醇式构型,研究了TrMA在不对称聚合过程中的立体化学。
Triphenylmethacrylate (TrMA) In asymmetric polymerization, an optically active polymer with a one-handed helical chain conformation can be formed in the presence of the chiral ligand, tentorithin ((-) - S_p). Vogt TrMA active dimer initiator, polymerization TrMA, the results show that the right-handed helical chain of poly (methyl methacrylate) (PTrMA) asymmetric carbon atom in the main are S-type, and Okamoto The method of chromatographic resolution of PTrMA oligomers yielded the opposite result, but the reasons why the chiral ligands determine the direction of the helix have not been reported. In this paper, the stereochemistry of TrMA during asymmetric polymerization was studied from the conformation of monomer, the conformation of (-) - S_p and the enol configuration of PTrMA.