title: Electrophilic reactivities of 1,2-diaza-1,3-dienes.
abstract: The kinetics of the reactions of 1,2-diaza-1,3-dienes 1 with acceptor-substituted carbanions 2 have been studied at 20 °C. The reactions follow a second-order rate law, and can be described by the linear free energy relationship log k(20 °C)=s(N+E) [Eq. (1)]. With Equation (1) and the known nucleophile-specific parameters N and s for the carbanions, the electrophilicity parameters E of the 1,2-diaza-1,3-dienes 1 were determined. With E parameters in the range of -13.3 to -15.4, the electrophilic reactivities of 1a-d are comparable to those of benzylidenemalononitriles, 2-benzylideneindan-1,3-diones, and benzylidenebarbituric acids. The experimental second-order rate constants for the reactions of 1a-d with amines 3 and triarylphosphines 4 agreed with those calculated from E, N, and s, indicating the applicability of the linear free energy relationship [Eq. (1)] for predicting potential nucleophilic reaction partners of 1,2-diaza-1,3-dienes 1. Enamines 5 react up to 10(2) to 10(3) times faster with compounds 1 than predicted by Equation (1), indicating a change of mechanism, which becomes obvious in the reactions of 1 with enol ethers.
authors.affiliation: Department Chemie der Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany.
authors.forename: Tanja
authors.initials: T
authors.lastname: Kanzian
authors.forename: Simona
authors.initials: S
authors.lastname: Nicolini
authors.forename: Lucia
authors.initials: L
authors.lastname: De Crescentini
authors.forename: Orazio A
authors.initials: OA
authors.lastname: Attanasi
authors.forename: Armin R
authors.initials: AR
authors.lastname: Ofial
authors.forename: Herbert
authors.initials: H
authors.lastname: Mayr