The photolysis of tetrazoles leads to the extrusion of dinitrogen and forms a reactive nitrile imine intermediate. The latter can then react in situ with alkynes in a [3+2] cycloaddition providing pyrazoles. Some reactivity trends were identified, such as a preference for electron‐poor alkynes. On the tetrazole part, there is a clear preference for either aromatic or conjugated substituents.
四唑的光解导致二氮的挤出并形成反应性腈
亚胺中间体。然后后者可以在[3 + 2]环加成反应中与
炔烃原位反应,提供
吡唑。确定了一些反应性趋势,例如偏爱电子贫乏的
炔烃。在
四唑部分,显然优选芳族或共轭取代基。