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Updated: Jun 6, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Routes to Cyclobutadiene and Cycloallyl Pt(II) Complexes: Dicationic Bis(Alkyne) Species as Intermediates
Ouchan He1, Froze Jameel2, Y Einar H Stampehl1
1Department of Chemistry, Humboldt-Universität Zu Berlin, Berlin, Germany.
None:
Transition metal alkyne complexes can be crucial intermediates for a variety of transformations. Cyclobutadiene can be generated by metal-mediated C-C coupling reactions, but this often requires an elaborate synthetic strategy. As a result, only a few examples of Pt(II) cyclobutadiene complexes have been described so far. Herein, we report on the development of a synthetic route to access cationic Pt(II) η3-cycloallyl complexes [Pt(η3-(C2H5C)3C═C2H4)(L)][BF4] bearing various chelating diphosphine ligands (L). Their generation and its dependence on the choice of L were studied using a combined experimental and quantum chemical approach. Dicationic bis(alkyne) BF4 complexes are essential intermediates for the generation of η3-cycloallyl compounds. An investigation on the reactivity of Pt(II) η3-cycloallyl complexes toward the Brønsted acids HCl and HBF4·Et2O led to the formation of cationic and dicationic Pt(II) η4-cyclobutadiene complexes.
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