Abstract:
Three kinds of novel dendritic carbazole derivatives were designed and synthesized via three steps using 1,8-diiodobiphenyl and 1,4-dibromobenzene as starting material. In this process, two pairs of conjugate molecules, which were obtained through Ullmann coupling reaction between phenyldihalide and carbazole, reacted with NBS to generate three multi-brominated intermediates: 3,3′,6-tribromo-1,4-bis-carbazolyl-benzene, 3,3′,6,6′-tetrabromo-1,4-bis-carbazolyl-benzene, 3,3′,6- tribromo-1,4-bis-carbazolyl-biphenyl. Then, the desired novel dendritic carbazole derivatives including 3,3′,6-Tri(N-carbazolyl)-1,4-bis-carbazolyl-benzene, 3,3′,6,6′-Tetra(N-carbaolyl)-1,4-bis-carbazolybenzene, 3,3′,6-Tri(N-carbazolyl)-1,8-bis-carbazolyl-biphenyl were formed through Ullmann coupling again with multi-brominated compounds and carbazole. The intermediates and target products were characterized by 1H NMR, 13C NMR and MS.
