Fu, Zhan-Da Guo, Qing-Hui Zhao, Liang Wang, De-Xian Wang, Mei-Xiang Synthesis and Structure of Corona[6](het)arenes Containing Mixed Bridge Units A one-pot nucleophilic aromatic substitution reaction of 3,6-dichlorotetrazine with various diphenols and dibenzenethiols produced corona[4]­arene[2]­tetrazines 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 corona[4]­arene[2]­pyridazines. The acquired corona[6]­arenes adopted three types of conformational structures in the crystalline state. Macrocyclic ring transformations;sulfone linkages;tetrazine moieties;corona;substitution reaction;sulfide oxidation reaction 2016-05-16
    https://acs.figshare.com/articles/dataset/Synthesis_and_Structure_of_Corona_6_het_arenes_Containing_Mixed_Bridge_Units/3382570
10.1021/acs.orglett.6b01112.s018