多官能团分枝状化合物的合成研究——Ⅸ.几个分支侧链的合成

The Synthesis of Multifunctional Groups and Multibranched Compounds∶Ⅸ. Synthesis of Several Branched Building Block

在新型多分枝大分子Ｄｅｎｄｒｉｍｅｒｓ的合成研究中，设计和合成适当的分支侧链是其关键之一，为了更有效的合成这种多分枝大分子，作者设计了４个新的分支侧链，并分别以丙二酸二乙酯和季戊醇为原料，经２～４步反应将其合成，其结构经ＩＲ和１ＨＮＭＲ光谱等确证。与文献报道的分支侧链相比，存在着成醚分枝化程度高和空间位阻小等特点。

The branched building plays a pivotal part in the study of Dendrimers. In order to synthesized Dendrimers more effectively, we designed and synthesized four new branched building blocks via 2 4 steps starting from diethyl malonate and pentaerythritol. Their structures were confirmed by IR and 1HNMR etc. They compare favourably with previous branched building blocks as regards to steric hindrance and branched effect.