ACTIVATING EFFECT OF AlCl₃ IN HOMO-COUPLING REACTION OF ACETYLENE COMPOUNDS UNDER THE ACTION OF Mg–Cp₂ZrCl₂ REAGENT SYSTEMS

Abstract

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.