中文摘要：

在这份报纸，与悬挂的羧基的组一起的脂肪族的聚酯 functionalized 经由几步被综合。第一，代替了周期的酉同类， 2-(benzyloxycarbonyl 甲基) cyclopentanone (BCP ) 与 benzyl-2-bromoacetate 通过 enamine 的反应被准备，并且随后变换成相关 functionalized -valerolactone 衍生物， 5-(benzyloxy carbonylmethyl )-- 由 Baeyer-Villiger 氧化的 valerolactone (BVL ) 。第二，有 -caprolactone 的 BVL 的戒指洞聚合大批被执行把亚锡的 octoate 用作催化剂 poly 生产(忍受保护本甲基的 carboxyl 的 -caprolactone-co--valerolactone) 功能的组[P (CL-co-BVL )] 。最后， P (CL-co-BVL ) 的保护本甲基的组被把 Pd/C 用作催化剂 poly 获得的 H2 有效地移开(忍受悬挂的羧基的酸的 -caprolactone-co--valerolactone)[P (CL-co-CVL )] 。结构和聚合物的性质被原子磁性的回声(NMR ) 学习了， Fourier 红外线的光谱学(英尺红外) 和微分扫描热量测定(DSC ) 等等。NMR 和英尺红外结果证实了聚合物结构，并且 13C NMR 系列清楚地解释了 -caprolactone 和 5-(benzyloxycarbonylmethyl ) 的顺序 -- 在共聚物的 valerolactone。当保护本甲基的组被移开时，生羧基的组的脂肪族的聚酯被获得。而且，聚合物的 hydrophilicity 被改进。因此， poly (-caprolactone-co--valerolactone) 可能在生物医学的地里有大潜力。

英文摘要：

In this paper, aliphatic polyesters functionalized with pendant carboxylic groups were synthesized via several steps. Firstly, substituted cyclic ketone, 2-（benzyloxycarbonyl methyl）cyclopentanone （BCP） was prepared through the reaction of enamine with benzyl-2-bromoacetate, and subsequently converted into the relevant functionalized 6-valerolactone derivative, 5-（benzyloxy carbonylmethyl）-δ-valerolaetone （BVL） by the Baeyer-Villiger oxidation. Secondly, the ring-opening polymerization of BVL with ε-caprolactone was carried out in bulk using stannous octoate as the catalyst to produce poly（ε-caprolactone-co-δ-valerolactone） bearing the benzyl-protected carboxyl functional groups [P（CL-co-BVL）]. Finally, the benzyl-protecting groups of P（CL-co-BVL） were effectively removed by H2 using Pd/C as the catalyst to obtain poly（ε-caprolactone-co-δ-valerolactone） bearing pendant carboxylic acids [P（CL-co-CVL）]. The structure and the properties of the polymer have been studied by Nuclear Magnetic Resonance （NMR）, Fourier Infrared Spectroscopy （FT-IR） and Differential Scan Calorimetry （DSC） etc. The NMR and FT-IR results confirmed the polymer structure, and the 13C NMR spectra have clearly interpreted the sequence of ε-caprolactone and 5-（benzyloxycarbonylmethyl）-δ-valerolactone in the copolymer. When the benzyl-protecting groups were removed, the aliphatic polyesters bearing carboxylic groups were obtained. Moreover, the hydrophilicity of the polymer was improved. Thus, poly（ε-caprolactone-co-δ-valerolactone） might have great potential in biomedical fields.