European Journal of Inorganic Chemistry

Cover image for Vol. 2016 Issue 17

Editor: Karen Hindson, Deputy Editor: Preeti Vashi

Impact Factor: 2.942

ISI Journal Citation Reports © Ranking: 2014: 9/45 (Chemistry Inorganic & Nuclear)

Online ISSN: 1099-0682

Associated Title(s): Angewandte Chemie International Edition, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemCatChem, Zeitschrift für anorganische und allgemeine Chemie

2012_25/2012An Insight into the Reversible Dissociation and Chemical Reactivity of a Sterically Encumbered Diphosphane (Eur. J. Inorg. Chem. 25/2012)

The cover picture shows the amazingly diverse reactivity of a sterically encumbered diphosphane towards alkynes. The steric hindrance facilitates homolytic cleavage of the P–P bond: the experimentally determined dissociation energy of 79 kJ mol–1 is substantially lower than the gas-phase dissociation energies of small diphosphanes, and a substantial amount of the diphosphane dissociates even at ambient temperature into phosphanyl radicals (the double horse, which is reminiscent of the arms of the city of Stuttgart, is meant as an allegory for this process). Chemical reactions of this equilibrium mixture may either follow a radical mechanism as in the trans addition of two radicals to the triple bond of an unactivated alkyne. Alternatively, a substrate can bypass the radicals to react with the intact diphosphane, as in the unexpected ring metathesis reaction with an electron-poor alkyne. Details are discussed in the article by D. Gudat et al. on p. 3989 ff.

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