Attack by allenes on a bridging alkylidyne ligand at a ditungsten centre: formation of a bridging allyl-η3-W1,σ-W2-alkylidene ligand
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 24,p. 1755-1757
- https://doi.org/10.1039/c39850001755
Abstract
The alkylidene bridged compounds [(Me3SiCH2)2W(µ-CSiMe3)]2(1), [(Me3SiCH2)(ButO) W(µ-CSiMe3)]2(2) and [(PriO)2W(µ-CSiMe3)]2(3) each react with allenes R1CHCCHR2, where R1= R2= H, Me or R1= Me, Ph and R2= H, to give, by C–C bond formation between the tertiary carbon atom of the allene and the bridging carbon atom of one of the µ-CSiMe3 ligands, a bridging ligand which is a formally a π-allyl to one tungsten atom and a terminal alkylidene to the other; the rate of reactions follows the order (1) > (2) > (3); CH2 CCH2 RCHCCH2 > RCHCCHR, and the C–C bond formation is stereoselective.Keywords
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