Neutral η-arene complexes of rhodium(I); X-ray structure of η-toluene(η-cyclo-octene)[bis{bis(trimethylsilyl)amido}chlorostannate(II)}]rhodium(I)

Abstract

Stable, crystalline, neutral arene–Rh^I complexes, [Rh(η-ArH)(η-C₈H₁₄){SnCl(NR₂)₂}][R = SiMe₃, C₈H₁₄= cyclo-ocetne; and ArH = PhMe (1a), C₆H₃Me₃-1,3,5 (1b), or C₆Me₆(1c) and [Rh(η-PhMe)(η-trans-hex-3-ene){SnCl(NR₂)₂}](2), are obtained from [{Rh(alkene)₂](µ-Cl)}₂], 2Sn(NR₂)₂, and excess of ArH at 20 °C, or, for (1a), from Sn(NR₂)₂, C₈H14, PhMe, and [Rh(µ-Cl){Sn(NR₂)₂}(₂)₂](3), itself prepared from [{Rh(η-C₈H₁₄)₂Cl}₂] and 4Sn(NR₂)₂ in n-C₆H₁₄ at 20 °C unexpectedly facile arene displacement reactions convert (1a) into (1b) or (1c), and (1b) into (1c), and the X-ray structure of (1a) shows a planar Rh environment.