title: Interconversion of contact and separated ion pairs in silyl- and arylthio-substituted alkyllithium reagents.
abstract: Ether-solvated contact and separated ion pairs (CIP and SIP) for two lithium reagents, tris(trimethylsilyl)methyllithium (1) and bis(3,5-bistrifluoromethylphenylthio)methyllithium (2), have been characterized and observed for the first time under conditions of slow exchange by NMR spectroscopy, and barriers to interconversion have been measured. A Saunders isotope perturbation experiment was used to support identification of the CIP and SIP species for 2.
authors.affiliation: Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, WI 53706, USA. reich@chem.wisc.edu
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Reich
authors.forename: William H
authors.initials: WH
authors.lastname: Sikorski
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Thompson
authors.forename: Aaron W
authors.initials: AW
authors.lastname: Sanders
authors.forename: Amanda C
authors.initials: AC
authors.lastname: Jones