C 3 symmetric triformylsumanene was selectively synthesized from C 3 symmetric syn-tris(oxonorborneno)benzene, featuring ring-opening/closing metathesis reactions of syntris( methoxymethylnorbornadieno)benzene and DDQ oxidation. Triformylsumanene can be an intermediate to synthesize C 3 symmetric trisubstituted sumanenes by further transformation. Tris(ethoxycarbonylethenyl)sumanene was prepared through the HornerWadsworthEmmons reaction. Its optical and electrochemical behaviors were investigated.
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