883970-40-9Relevant articles and documents
Hexa-peri-hexabenzocoronenes by efficient oxidative cyclodehydrogenation: The role of the oligophenylene precursors
Feng, Xinliang,Wu, Jishan,Enkelmann, Volk,Muellen, Klaus
, p. 1145 - 1148 (2007/10/03)
Oligophenylene precursors based on 1,3,5-tris-(2′-biphenyl)ylbenzene (4a) and 1,4-bis-(2′-biphenyl)yl-2,5-diphenylbenzene (5a) were prepared and utilized for efficient hexabenzocoronene (HBC) synthesis by cyclodehydrogenations. Parent HBC 6a was efficiently synthesized from the 1,3,5-tris-(2′-biphenyl)ylbenzene precursor, and novel D3h symmetrical HBCs were prepared from 1,3,5-tris-(2′-biphenyl)ylbenzenes with various substitution types. For the preparation of a tert-butyl containing HBC 7 with D2h symmetry, a two-step cyclodehydrogenation was required because of changes in the spin density distribution.