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本文合成及制备了下述六个系列的化合物并测定了它们的紫外光谱、质谱。结果表明: α-C_4H_3O-(CH=CH)nCHO (FA-n) n=2,3,4,5。 α-C_4H_3O-(CH=CH)nCN FN-n) n=1,2,3~*,4~*,5~*。 α-C_4H_3O-(CH=CH)nCO_2Et (FE-n) n=1,2,3~*,5~*。 α-C_4H_3O-(CH=CH)nCH=C(CN)CO_2H (FNA-n)n=0,1,3~*,4~*。 α-C_4H_3O-(CH=CH)nCH=C(CN)CO_2Et (FNE-n)n=0,1,3~*,4~*, α-C_4H_3O-(CH=CH)nCH=C(CO_2Et)_2·(FM-n) n=0,1,3~*,4~*,5~*。 (*:表示文献中未知的化合物) 在环己烷、乙醇,甲醇和四氯化碳溶剂中各组电子吸收峰的波数与同系因子相联系时,都各有一条而且只有一条良好的直线。同系线性规律的专一性表明了,在呋喃多烯三岔系列中,呋喃环的端基当量仍然是2。并不因为在烯链的另一端具有两个强吸电子的共轭分岔基团的存在而增大呋喃环的端基当量。在FM-n系列中,利用经验公式算得的Sj′以及利用相似三角形式算得的sj的平均值都在0.4左右。这就定量地表明了,在末端二个羧酸酯基中,只可能有一个是端基,而另一个是代基。λ′计-λ实的最大值小于80的事实表明,FM-n系列的紫外吸收频率与结构之间的定量关系可以用扩大同系方程来近似地表示。但在FNE-n系列中,由于氰基的存在,用扩大同系方程计算得到的λ值与实验值偏差较大,?
In this paper, the following six series of compounds were synthesized and prepared, and their UV spectra and mass spectra were measured. The results show that α-C_4H_3O- (CH = CH) nCHO (FA-n) n = 2,3,4,5. α-C_4H_3O- (CH = CH) nCN FN-n) n = 1, 2, 3 ~ *, 4 ~ *, 5 ~ *. α-C_4H_3O- (CH = CH) nCO_2Et (FE-n) n = 1, 2, 3 ~ *, 5 ~ *. α-C_4H_3O- (CH = CH) nCH = C (CN) CO_2H (FNA-n) n = 0,1,3 to *, 4 to *. α-C_4H_3O- (CH═CH) nCH = C (CN) CO_2Et (FNE-n) n = 0,1,3 ~ *, 4 ~ *, α-C_4H_3O- (CH = CH) nCH = C (CO_2Et) _2 · (FM-n) n = 0, 1, 3 ~ *, 4 ~ *, 5 ~ *. (*: Indicates unknown compounds in the literature) Each wavenumber of electron absorption peaks in cyclohexane, ethanol, methanol, and carbon tetrachloride solvent has one and only one good straight line when it is related to a homologous factor. The specificity of the homologous linear law shows that the terminal equivalent of the furan ring is still 2 in the furadiene three-fork series. Does not increase the end group equivalent of the furan ring because of the presence of two strongly electron-withdrawing conjugated bifurcation groups at the other end of the olefin chain. In the FM-n series, the average value of Sj ’calculated using experience formulas and sj calculated using the similar triangles is around 0.4. This quantitatively shows that of the two terminal carboxylic acid ester groups, only one of them may be an end group and the other is a substituent. The fact that the maximum value of λ ’-calculated -λ is less than 80 indicates that the quantitative relationship between the UV absorption frequency and the structure of the FM-n series can be approximated by the expansion of the homology equation. However, in the FNE-n series, due to the presence of cyano groups, the value of λ calculated with the extended homologous equation deviates from the experimental value by a large margin.