compounds. Resonance effects contribute more heavily than inductive effects and show increasing importance as solvent coordination ability increases. Substituents in the meta-position show a reduced effect. Solvents have a pronounced effect on the barrier. The free energy of activation for any given compound increases in the order: C6D6 $̌CDCl3, ≈ CD3CN ČF3CH2OD. This trend is discussed in terms of the electrophilic
通过在四种溶剂:C 6 D 6,CDCl 3,CD中的13 C-NMR光谱中交换的烷基碳的全带形分析,计算了一系列取代的N,N-二
乙基苯甲酰胺中绕CN键旋转的障碍。3 CN和CF 3 CH 2OD。对于D-取代的化合物,在哈米特取代基参数和总活化势垒之间是线性自由能关系,这是显而易见的。共振效应的贡献要大于感应效应,并且随着溶剂配位能力的提高,其重要性日益增加。间位的取代基显示出降低的作用。溶剂对隔离层有明显的影响。活化的在顺序任何给定的化合物的增加的自由能:C 6 d 6 $ CDCL 3,≈CD 3 CN CF 3 CH 2 OD。根据溶剂的亲电特性讨论了这种趋势。