Structure and stability relationship of 1,1-dimethyl-2-[.BETA.-(.ALPHA.-aroylstyryl)]hydrazine derivatives.
作者:FARONKH. AL-HAJJAR、MOHAMEDS. EL-EZABY、NIZARR. EL-RAYYES
DOI:10.1248/cpb.25.548
日期:——
Aroylphenylacetylenes (I) reacted with N, N-dimethylhydrazine (II) to give 1, 1-dimethyl-2-[β-(α-aroylstyryl)] hydrazine (III). The structure and configuration of the products are based on chemical and spectroscopic evidence. The protonation constants of these compounds were calculated in 60 wt % dimethylformamide-water media. The effects of substituents on the protonation equilibria are discussed. The log β values were linearly correlated with Hammett substituent constant. The equation of the straight line : log β=(-0.52±0.049)σ+(3.86±0.02).
酰基苯乙炔 (I) 与 N,N-二甲基肼 (II) 反应生成 1,1-二甲基-2-[β-(α-芳基苯乙烯基)] 肼 (III)。产物的结构和构型是根据化学和光谱证据确定的。这些化合物的质子化常数是在 60 wt % 二甲基甲酰胺-水介质中计算得出的。讨论了取代基对质子化平衡的影响。对数 β 值与 Hammett 取代基常数呈线性相关。直线方程为:log β=(-0.52±0.049)σ+(3.86±0.02)。