Synthesis and Structure of 1-Zirconacyclopent-3-yne Complexes without Substituents Adjacent to the Triple Bond
- 9 December 2003
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 126 (1) , 60-61
- https://doi.org/10.1021/ja0385742
Abstract
Five-membered metallacyclic alkynes that have no substituents adjacent to the triple bond have been synthesized, isolated, and structurally characterized. Zirconocene dichlorides, Cp‘2ZrCl2 (Cp‘ = C5H5, C5H4-t-Bu), reacted with 1,4-dichlorobut-2-yne in the presence of magnesium to give 1-zirconacyclopent-3-yne compounds (5 (a) Cp‘ = C5H5, (b) Cp‘ = C5H4-t-Bu) that have a −CH2C⋮CCH2− moiety in good yields. They are stable enough to be isolated in a pure form, despite the absence of substituents. 5a reacted with an equimolar amount of Cp2Zr(but-1-ene)(PMe3) to produce a bimetallic complex in which the zirconacyclopentyne coordinates to the other zirconocene moiety as an alkyne.Keywords
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