Enantioselective Annulation Reactions by N-Heterocyclic Carbene Catalysis via α,β-Unsaturated Acyl Azolium Intermediates ZHANGCHANGHE 2018 The thesis describes my major findings in my PhD on the topic of N-heterocyclic carbene catalyzed enantioselective annulation reactions involving α,β-unsaturated acyl azolium intermediates, including the all-carbon (4+2) annulation, the Claisen condensation-Claisen rearrangement cascade and indene synthesis.