A new method for the identification of the structure of terminal units in poly(1,3‐pentadiene) synthesized by cationic mechanism is developed. The conducting of NMR experiments with a T₂ filter allows the intensities of the spectral signals of carbon and hydrogen atoms of main chain groups of poly(1,3‐pentadiene) with a short relaxation time to be decreased and significantly increases the intensities of signals of carbon and hydrogen atoms of head and end groups, which are characterized by higher mobility. Using 1D NMR spectroscopy with a T₂ filter as well as 2D heteronuclear single‐quantum correlation and heteronuclear multiple‐bond correlation NMR spectroscopy, it is found that the position of four out of five carbon atoms of the head group fully coincides with the position of spectral signals of carbon atoms of trans‐1,2‐ and trans‐1,4‐ units of a main polymer chain. This new method allows the identification of the signals of all carbon atoms in head trans‐1,4‐ group of poly(1,3‐pentadiene).

中文翻译：

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用T2过滤NMR光谱法研究聚（1,3-戊二烯）末端单元结构的新方法

提出了一种通过阳离子机理合成鉴定聚（1,3-戊二烯）末端单元结构的新方法。使用T ₂滤光片进行NMR实验可在短弛豫时间下降低聚（1,3-戊二烯）主链基团的碳和氢原子光谱信号的强度并显着提高信号强度端基和端基的碳原子和氢原子具有较高的迁移率。使用带有T _2的1D NMR光谱过滤器以及二维异核单量子相关和异核多键相关NMR光谱，发现的是，头部基团的与碳原子的频谱信号的位置完全一致五分之四的碳原子的位置反式-主聚合物链的1,2-和反式1,4-单元。这种新方法可以识别聚（1,3-戊二烯）的反式--1,4-基团中所有碳原子的信号。