4.5 Article

A mechanistic rationale for the outcome of Sonogashira cross-coupling of 9-bromoanthracene and ethynyltrimethylsilane: An unexpected product 4-(9-anthracenyl)-1,3-bis(trimethylsilyl)-3-en-1-yne

Journal

JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 880, Issue -, Pages 1-6

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2018.10.015

Keywords

Palladium catalysis; Arene-alkyne couplings; Enynes; X-ray crystallography; Reaction mechanisms

Funding

  1. Synthesis and Solid State Pharmaceutical Centre (SSPC) - Science Foundation Ireland [12/RC/2275]

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The Sonogashira reaction of 9-bromoanthracene and ethynyltrimethylsilane furnishes not only the anticipated 9-(trimethylsilylethynyl)anthracene and 2-(trimethylsilyl)aceanthrylene but also (E)-4-(9-anthracenyl)-1,3-bis(trimethylsilyl)-but-3-en-1-yne, all in moderate yields. A mechanistic rationale is proposed that invokes the intermediacy of bromo(anthracenyl)bis(triphenylphosphine)palladium(II) that can undergo coupling either directly, or after coordination and migratory insertion of the free alkyne. (C) 2018 Elsevier B.V. All rights reserved.

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