Diallene Formation by Copper(I)-Mediated Reactions of Zirconacyclo­pentanes with Propargyl Halides

Abstract

In the presence of CuCl, zirconacyclopentanes reacted with two equivalents of a propargyl halide to give bisallenylation products in moderate to high yields. By controlling the amount of CuCl, stepwise allenylation was achieved and a variety of unsymmetrically substituted diallene derivatives were prepared as well.

propargyl electrophile - zirconacyclopentane - allene - S_N2′ reaction - copper(I) chloride

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