Attack by allenes on a bridging alkylidyne ligand at a ditungsten centre: Formation of a bridging Allyl-η3-W1,σ-W2-alkylidene ligand

Malcolm H. Chisholm, Kirsten Folting, Joseph A. Heppert, William E. Streib

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Abstract

The alkylidyne 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 R1CH=C=CHR2, 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 formally a π-allyl to one tungsten atom and a terminal alkylidene to the other; the rate of reaction follows the order (1) >(2) >(3); CH2=C=CH2 > RCH=C=CH2 > RCH=C=CHR, and the C-C bond formation is stereoselective.

Original languageEnglish
Pages (from-to)1755-1757
Number of pages3
JournalJournal of the Chemical Society - Series Chemical Communications
Issue number24
DOIs
StatePublished - 1985

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