The clickabilities of various alkenyl and alkyl azides in the strain-promoted cycloaddition with dibenzo-fused cyclooctynes were investigated. Although alkenyl azides generally exhibited lower clickabilities than those of alkyl azides, a sterically-hindered alkenyl azide showed high reactivity comparable with those of alkyl azides. Theoretical analyses indicated that these unique reactivities are derived from the frontier molecular orbital interactions and distortability of the azido groups.
                                    研究了各种烯基
叠氮化物和烷基
叠氮化物在与二苯并融合
环辛炔进行应变促进环加成反应时的点击率。虽然烯基
叠氮化物的点击率通常低于烷基
叠氮化物,但一种立体受阻的烯基
叠氮化物却表现出与烷基
叠氮化物相当的高反应性。理论分析表明,这些独特的反应活性源于
叠氮基团的前沿分子轨道相互作用和畸变性。