Cleavage and formation reactions carbon–carbon and tungsten–carbon bonds involving bis-η-cyclopentadienyltungsten compounds

Abstract

Tungsten atoms react with spiro[2.4]hepta-4,6-diene giving [[graphic omitted]H₂)₂](1) which undergoes hydride abstraction with Ph₃C⁺ giving the cation [W(η⁵:η²:η⁵-C₅H₄CH₂CHCHCH₂C₂H₄)H]⁺(3); complex (1) react with PhlCl₂ to give [W(η-C₅H₄CH₂CH₂Cl)₂Cl₂], (9), which is reduced back to (1) with sodium amalgam; the compounds [[graphic omitted]H₂)(η-C₅H₄Et)I], (6) undergoes reversible 1,2-hydrogen shift reactions when treated with tertiary phosphines.