Zirconacyclopropanes and Zirconacyclopropenes. Their Synthesis, Characterization, and Reactions

Article abstract of DOI:10.1246/cl.1987.623

Zirconacyclopropenes represented by Cp2Zr(PhCCPh)(PR3) (4), where PR3 is PMe3 or PMePh2, have been prepared by the reaction of Cp2Zr(PR3)2 with PhC<*>CPh, isolated as yellowish crystals, and spectroscopically characterized.Zirconacyclopropenes readily react with proton donors, carbonyl compounds, e.g., acetone, and alkynes to induce dimerization of alkynes and are likely intermediates in the ZrCp2-induced bicyclization of enynes.