title: Stereodynamics and characterization of the hexa(4-n-dodecylbiphenylyl)benzene hexaanion that includes a twisted benzene core.
abstract: Hexa(4-n-dodecylbiphenylyl)benzene (HDBB) was reduced by a series of alkali metals in THF under high vacuum. Three reduction states were identified by NMR spectroscopy, namely the dianion, tetraanion and hexaanion. The NMR spectra of HDBB(6-) revealed a remarkable distortion of symmetry, which is interpreted by adoption of a twisted conformation of the central benzene ring and a slow rotation of the inner phenylene rings of the biphenyl units. Due to the surprising thermal stability of the hexaanion, a dynamic NMR investigation revealed the pseudorotation of the twisted conformation and the phenylene rotation mentioned above.
authors.affiliation: Department of Organic Chemistry, The Hebrew University of Jerusalem, The Safra Campus Givat-Ram, Israel.
authors.forename: Lior
authors.initials: L
authors.lastname: Eshdat
authors.forename: Roy E
authors.initials: RE
authors.lastname: Hoffman
authors.forename: Andreas
authors.initials: A
authors.lastname: Fechtenkötter
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
authors.forename: Mordecai
authors.initials: M
authors.lastname: Rabinovitz