Reaction of 1-Zirconacyclopent-3-yne with “Zirconocene”:  Synthesis and Structure of Bimetallic 1,2,3-Butatriene Complexes¹

Abstract

A 1-zirconacyclopent-3-yne complex (1) reacted with “zirconocene” to give a symmetrical, bimetallic 1,2,3-butatriene complex (6) in which butatriene coordinates to two equivalent zirconocene units. Treatment of 6 with trimethylphosphine gave the phosphine-stabilized zirconocene−1 complex (2), which was transformed into 6 by addition of triethylborane.