title: Chromium-mediated synthesis of polycyclic aromatic compounds from halobiaryls.
abstract: [reaction: see text] Reaction of 2,2'-dihalobiphenyl with butyllithium followed by the addition of chromium(III) chloride and alkynes afforded the corresponding phenanthrene derivatives via formal [4 + 2] cycloaddition. A variety of alkynes could be used for this reaction, such as alkyl, aryl, silyl, and alkoxycarbonyl alkynes. Repetitive process of the reaction gave more extended polycyclic compounds such as benzo[g]chrysene and azacyclopentaphenalene derivatives.
authors.affiliation: Catalysis Research Center, and Graduate School of Pharmaceutical Sciences, Hokkaido University, and SORST, Japan Science and Technology Agency (JST), Sapporo 001-0021, Japan.
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Kanno
authors.forename: Yuanhong
authors.initials: Y
authors.lastname: Liu
authors.forename: Atsushi
authors.initials: A
authors.lastname: Iesato
authors.forename: Kiyohiko
authors.initials: K
authors.lastname: Nakajima
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Takahashi