Cp2ZrCl2 – Et3Al reagent system in the homo-coupling of trimethylsilyl-substituted alkynes

The activating effect of AlCl3 in the amount of 10 mol. % in the homo-coupling of alkyl-, phenyl-, and silyl-substituted acetylenes with the Mg–Cp2ZrCl2 reagent system was found for the first time. The unique nature of this activation is indicated by the fact that in the presence of 10 mol. % of Lewis acids such as BF3 ⋅ Et2O, Me3SiCl, InCl3, and SnCl4, the reaction with 5-decyne does not occur even after 5 h, while in the presence of AlCl3, homocoupling products are selectively formed in high yield in 10 min at room temperature.

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Cp₂ZrCl₂ – Et₃Al reagent system in the homo-coupling of trimethylsilyl-substituted alkynes

Abstract: The reaction of trimethylsilyl-substituted alkynes with 0.5 equivalents of Cp2ZrCl2 and 1 equivalent of Et3Al in toluene at room temperature gives products of the homo-coupling in good yield.

Cited by 3 publications

References 19 publications

Tantalum-catalyzed reaction of disubstituted acetylenes with EtAlCl2

Tantalum-catalyzed reaction of disubstituted acetylenes with EtAlCl2

Activating Effect of AlCl3 in Homocoupling Reaction of Acetylene Derivatives under the Action of Mg–Cp2ZrCl2 Reagent Systems

ACTIVATING EFFECT OF AlCl<sub>3</sub> IN HOMO-COUPLING REACTION OF ACETYLENE COMPOUNDS UNDER THE ACTION OF Mg–Cp<sub>2</sub>ZrCl<sub>2</sub> REAGENT SYSTEMS

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