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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Spirocyclic germanes via transannular insertion reactions of vinyl germylenes into Si-Si bonds
Małgorzata Walewska1, Judith Baumgartner, Christoph Marschner
1Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010 Graz, Austria.
Abstract:
The reactions of two cyclic germylene phosphane adducts with monosubstituted acetylenes caused the formation of spirocyclic germanes, which is postulated to occur by double acetylene insertion into germylene attached bonds. Further insertion of the formed cyclic divinylgermylene into transannular Si-Si or Si-Ge bonds provides the spirocyclic germanes. Thermal treatment of two germacyclopropenes, formed by the reaction of the two cyclic germylene phosphane adducts with tolane, also produced spirocyclogermanes. The structures of the latter require, however, a more complicated mechanistic proposal.
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