The Substituent Effect. V. NMR Chemical Shifts of Hydrogen-bonding Hydroxyl Proton of Phenols in DMSO
作者:Mizue Fujio、Masaaki Mishima、Yuho Tsuno、Yasuhide Yukawa、Yoshio Takai
DOI:10.1246/bcsj.48.2127
日期:1975.7
subject to the steric loss of their coplanarity with the benzene ring. The substituent effects were treated successfully with the equation, Δδ=ρ(σ0+r−Δ\barσR−). The phenol series gave r−=0.673 and ρ=1.530. The same r− value appeared to be applicable to all the other series with negligible changes in the ρ value. Deviations from the correlation of particular substituents, in particular those having acidic
在 DMSO 中测定了 m-和 p-取代苯酚以及 4-取代 2-甲酚、3-甲酚和 2,6-二甲苯酚的氢键 OH 质子的化学位移。取代基对这些系列的羟基化学位移的影响彼此线性相关(相关系数> 0.999),除了 3-甲酚系列中庞大的平面取代基可能会受到它们与苯环。用方程Δδ=ρ(σ0+r-Δ\barσR-)成功地处理了取代基效应。苯酚系列给出 r-=0.673 和 ρ=1.530。相同的 r- 值似乎适用于所有其他系列,而 ρ 值的变化可以忽略不计。偏离特定取代基的相关性,特别是那些具有酸性氢的取代基,