title: Syntheses of syn and anti doublebent [5]phenylene.
abstract: [structure: see text] The parent and dipropyl-substituted anti (1a,b) and syn doublebent (2a,b) [5]phenylenes have been assembled by CpCo-catalyzed double cyclization of regiospecifically constructed appropriate hexaynes. (1)H NMR, NICS, and an X-ray structural analysis of 1a reflect the aromatizing effect of double angular fusion on the central ring of the linear [3]phenylene substructure.
authors.affiliation: Center for New Directions in Organic Synthesis, Department of Chemistry, University of California at Berkeley, and the Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, USA.
authors.forename: Dennis T-Y
authors.initials: DT
authors.lastname: Bong
authors.forename: Eugene W L
authors.initials: EW
authors.lastname: Chan
authors.forename: Rainer
authors.initials: R
authors.lastname: Diercks
authors.forename: Peter I
authors.initials: PI
authors.lastname: Dosa
authors.forename: Michael M
authors.initials: MM
authors.lastname: Haley
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Matzger
authors.forename: Ognjen S
authors.initials: OS
authors.lastname: Miljanić
authors.forename: K Peter C
authors.initials: KP
authors.lastname: Vollhardt
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Bond
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Teat
authors.forename: Amnon
authors.initials: A
authors.lastname: Stanger