100% Functional Group Conversion of Polymer Termini via Step Polymerization and the Universality

以3,3′-二硫代二丙酸为原料，与二醇、聚己内酯二醇（Mn=1）等a， 2羟基聚合物脱水缩聚合成聚酯。6 × 103, MW/Mn=1。8)使用钪催化剂(0。5摩尔%)。随后，我们对二硫键进行了裂解，得到了预期的二硫醇，收率很高。通过II-1 NMR和MALDI-ToF谱证实了官能团的转化。我们还通过“点击”聚合将1,2双（2叠氮乙氧基）乙烷转化为相应的二硫醇（收率94%）。

We synthesized polyesters via dehydration polycondensation of 3, 3'-dithiodipropioicacid with diols and a, wdihydroxyl polymers including polycaprolactonediol(Mn=1. 6X 103, MW/Mn=1. 8) using scandium catalysts(0. 5 mol%). Subsequently, we performed cleavage of the disulfide linkage to give expected dithiol in good yields. The conversions of the functional group were confirmed by II-1 NMR and MALDI-ToF spectra. We also performed the conversion of 1, 2bis(2azideethoxy) ethane for the corresponding dithiol via "click" polymerization(yield 94%).