analysis showed that N-thiobenzoyl-7-azabicyclo[2.2.1]heptane displays marked nonplanarity of the thioamide (1a, alpha = 167.1 degrees and |tau| = 11.2 degrees) as compared with the corresponding monocyclic pyrrolidine thioamide (2a, alpha = 174.7 degrees and |tau| = 3.9 degrees). In a series of para-substituted or unsubstituted thioaroyl-7-azabicyclo[2.2.1]heptanes (1a-1h), the planarity of the thioamide
X射线晶体学分析表明,与相应的单环吡咯烷硫代酰胺(1a,α= 167.1度和| tau | = 11.2度)相比,N-硫代苯甲酰基-7-氮杂双环[2.2.1]庚烷显示出明显的非平面度(1a,α= 167.1度和| tau | = 11.2度)。在图2a中,alpha = 174.7度,| tau | = 3.9度。在一系列对位取代或未取代的硫代芳酰基-7-氮杂双环[2.2.1]庚烷(1a-1h)中,硫代酰胺的平面度显着取决于取代基的电子性质。例如,在对硝基取代的化合物中,基本上恢复了平面度(1h,α= 175.2度,|τ| = 0.1度)。在溶液中,芳族取代基的吸电子特性增加与双环硫代酰胺的更大的旋转势垒有关,通过变温(1)H NMR光谱法和线形分析法测定。硝基苯-d5中1a的旋转势垒降低,即硫酰胺旋转的活化焓(DeltaH(双匕首))降低,与2a在硝基苯-d5中的降低相比,这与1a假定溶