title: Synthesis and structure of a polyphenylene macrocycle related to "cubic graphite".
abstract: [structure: see text] Palladium-catalyzed coupling of 1,2-bis(4-bromophenyl)-3,4,5,6-tetraphenylbenzene and the corresponding hexaphenylbenzene bis(boronic acid) gave a mixture of linear and cyclic oligomers of hexaphenylbenzene. An X-ray crystal structure of the tetrameric oligomer showed it to be the polyphenylene macrocycle 4 (C(168)H(112)). The roughly D(2) symmetric macrocycle contains a large central cavity, and it is one of the channel substructures of "phenylogous cubic graphite".
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Shen
authors.forename: Douglas M
authors.initials: DM
authors.lastname: Ho
authors.forename: Robert A
authors.initials: RA
authors.lastname: Pascal