Some novel cycloaddition reactions based on benzyne and olefins have been developed.These reactions were performed in the absence of a transition metal catalyst,and they displayed good yields.These cycloaddition reactions of benzyne with olefins provide effective routes for synthesizing benzocyclobutenes,biaryl compounds and 9,10-dihydrophenanthrene derivatives.
Zhao ChenXie HanJin-Hua LiangJun YinGuang-Ao YuSheng-Hua Liu
Three switchable macrocycles based on photochromic dithienylethene were synthesized under the template of dibenzylammonium hexafluorophosphate.Their structure were well-confirmed by NMR, ESI-MS and X-ray diffraction.Their photochromism indicated that they showed good reversibility in solution.Additionally,the theoretical calculation suggested that photoirradiation can change the cavity of macrocycles.
