The Substituent Effect. XI. Solvolysis of 5-, 6-, and 7-Substituted 1-(1-Naphthylethyl) Chlorides
作者:Yuho Tsuno、Masami Sawada、Takahiro Fujii、Yoshihiko Tairaka、Yasuhide Yukawa
DOI:10.1246/bcsj.48.3356
日期:1975.11
Fourteen 5-, 6-, and 7-substituted 1-(1-naphthylethyl) chlorides were prepared and the solvolysis rates were determined in 80% (v/v) aqueous acetone at 45 °C. The effects of −R substituents at respective positions were treated on the basis of the equation, logk⁄k0=ρiσi+ρx+σx+=ρ(Cijσi+qrij+σπ+). The position dependency of the inductive effect was given by Cij(=ρi⁄ρi,4α); C3α=1.37, C4α=1.00, C5α=0.75, C6α=0.57, and C7α=0.72. The Cij values appear to be correlated with Dewar’s simplified field function 1/rij. The position dependency of Pi-electronic effect given by the ratio ρπ+⁄ρi,4α=qr·ij+ was consistent with the prediction from the MO indices, such as Forsyth’s Δqij(ArCH2+ parameters. The same treatment was applied also to three other naphthalene reactivities, detritiation, pKa of α-naphthoic acids and pKa of naphthylammonium ions. The linear ρi–ρi relation holds among these reactions, suggesting a reaction-independent scheme of the inductive transmission. The qr·ij+ values vary at conjugate positions with reaction but not at non-conjugate positions irrespective of reactions. The results are discussed in comparison with those of relevant treatments.
制备了十四个5-、6-和7-取代的1-(1-萘乙基)氯化物,并在45°C下,80%(体积/体积)的乙酸水溶液中测定了其溶剂分解速率。基于方程logk⁄k0=ρiσi+ρx+σx+=ρ(Cijσi+qrij+σπ+),处理了在相应位置上的−R取代基的影响。诱导效应的位置依赖性由Cij(=ρi⁄ρi,4α)给出;C3α=1.37,C4α=1.00,C5α=0.75,C6α=0.57,C7α=0.72。Cij值似乎与Dewar的简化场函数1/rij相关。由比率ρπ+⁄ρi,4α=qr·ij+给出的π电子效应的位置依赖性与从MO指数(如Forsyth的Δqij(ArCH2+参数)的预测一致。同样的处理也应用于其他三种萘的反应性:脱氢、α-萘甲酸的pKa和萘甲基铵离子的pKa。在这些反应中,线性ρi–ρi关系成立,表明诱导传递的反应独立方案。qr·ij+值在共轭位置随反应变化,但在非共轭位置不随反应变化。结果在与相关处理的比较中进行了讨论。