two-bond proton to carbon correlations to unequivocally distinguish the major and minor regioisomers of ortho-halogenated pyridines and to aid in assignment of the corresponding proton and carbon chemical shifts. M06-2X/6-31+G(d,p) free energies of the regioisomeric intermediates arising from deprotonation correctly predict the experimentally observed preference and thus can be used to tune the substituent
1,1-ADEQUATE光谱清楚地显示了特定的两键质子与
碳的相关性,以明确地区分邻卤代
吡啶的主要和次要区域异构体,并有助于分配相应的质子和
碳化学位移。由去质子化引起的区域异构
中间体的M06-2X / 6-31 + G(d,p)自由能正确预测了实验观察到的偏好,因此可用于调整取代基的模式,以产生所需的区域
化学结果。