title: Towards a comprehensive hydride donor ability scale.
abstract: Rates of hydride transfer from several hydride donors to benzhydrylium ions have been measured at 20 °C and used for the determination of empirical nucleophilicity parameters N and s(N) according to the linear free energy relationship log k(20 °C) = s(N)(N+E). Comparison of the rate constants of hydride abstraction by tritylium ions with those calculated from the reactivity parameters s(N), N, and E showed fair agreement. Therefore, it was possible to convert the large number of literature data on hydride abstraction by tritylium ions into N and s(N) parameters for the corresponding hydride donors, and construct a reactivity scale for hydride donors covering more than 20 orders of magnitude.
authors.affiliation: Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (Haus F), 81377 München, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Horn
authors.forename: Ludwig H
authors.initials: LH
authors.lastname: Schappele
authors.forename: Gabriele
authors.initials: G
authors.lastname: Lang-Wittkowski
authors.forename: Herbert
authors.initials: H
authors.lastname: Mayr
authors.forename: Armin R
authors.initials: AR
authors.lastname: Ofial