Synthesis and Structure of Corona(het)arenes Containing Mixed Bridge Units
2016-05-16T18:09:38Z (GMT) by
A one-pot nucleophilic aromatic substitution reaction of 3,6-dichlorotetrazine with various diphenols and dibenzenethiols produced coronaarenetetrazines that contain mixed oxygen, sulfide, methylene, and sulfone linkages. Macrocyclic ring transformations employing an inverse-electron-demand Diels–Alder reaction of tetrazine moieties with enamines and the subsequent sulfide oxidation reaction afforded diverse coronaarenepyridazines. The acquired coronaarenes adopted three types of conformational structures in the crystalline state.