本文中研究了五个系列分流型三岔共轭体系,其中包括脂肪族多烯腈,芳香族多烯腈类和多烯酸类的电子吸收峰,以及二个系列的甲基氢—CH_3,次甲基氢—OCH_2及β-H的化学位移。所有这些性能都与同系因子形成良好线性关系。也研究了a-氰代羧酸酯的质谱,实验数据证明—COOEt基比—CN基容易断裂。失去COOEt的碎片比例值很大,未发现失掉CN基的碎片,表明CN基与烯链的共轭效应强于COOEt基。 虽然这些三岔体系中的各分支基团都是吸电子的,但与推电子的分支基团和代基一样,这些分支基团的引入都导致红移现象,因而三岔体系的同系直线都位于线型体系之下。而与后者形成一小夹角。 利用线型体系与三岔体系同系直线间的对比,根据其间的相似三角形的关系,可以准确地计算出分支基团的当量△Ns值。由于在各个三岔系列开头的化合物中分支基团的效应都小于一个链单位,可见分支基团不是端基而只起代基作用。同时还应用线型体系的扩大同系方程式,采用适当的代基当量计算了四个系列的电子吸收峰:所得结果与实验数据的偏差一般在±7毫微米以内。这也表明两个三岔分支基团中的一个可作为代基来处理。 随着三岔化合物共轭键的增长,分支基团的当量继续增大以致有时超过1,这表明在分流型三岔体系中,对分支基团的当量特别是在偕二氰基体 In this paper, five series of branched trifurfuryl conjugated systems were studied, including the electronic absorption peaks of aliphatic polyenenitriles, aromatic polyenenitriles and polyene acids, as well as two series of methyl hydrogen -CH 3, Chemical shifts of methine-OCH 2 and β-H. All of these properties have a good linear relationship with homosexual factors. Mass spectra of a-cyanocarboxylate have also been studied and experimental data demonstrate that -COOEt groups are more susceptible to cleavage than -CN groups. The loss of COOEt fragment ratio value is large, did not find lost CN-based fragments, indicating that the CN group and the olefin chain conjugation effect stronger than the COOEt group. Although the branching groups in these tripartite systems are all electron-withdrawing, the introduction of these branching groups leads to a red-shift phenomenon, as is the case with electron-pushing branching and substituting groups, Under the linear system. While forming a small angle with the latter. By using the comparison between linear systems and homologous straight lines of the trifurcated system, the equivalent △ Ns values ​​of the branched groups can be accurately calculated according to the relationship between similar triangles. Since the effect of the branching groups is less than one chain unit in the compounds at the beginning of each three-branched series, it can be seen that the branching groups are not terminal groups and serve only as substituents. At the same time, four series of electron absorption peaks were calculated by using the extended equivalent equation of the linear system. The results were in good agreement with the experimental data within ± 7 nm. This also indicates that one of the two tripartite branching groups can act as a substituent. As the conjugation of the trifluous compounds progresses, the equivalent weight of the branching groups continues to increase so that it sometimes exceeds 1, indicating that the equivalent weight of the branching groups in shunt-type trifurcated systems,