Polycarbon ligand chemistry. Novel behaviour of µ-η1,η2α,β-butadiy nyls towards metal fragment additions

Abstract

Reaction of [Ru ₂ (CO) ₆ (µ-PPh ₂ )(µ-η ¹ ,η ² _α,β -CC–C CR)] (R = Bu ^t 1a, Ph 1b) with the labile complexes [Pt(PPh ₃ ) ₂ (η-C ₂ H ₄ ], [Pt(dppb)(η-C ₂ H ₄ )] and [Ni(cod) ₂ ] or [Ni(CO) ₄ ] leads to the heteronuclear derivatives [Ru ₂ Pt(CO) ₇ (PPh ₃ )(µ ₃ -η ¹ ,η ¹ ,η ¹ -CC–C CR)(µ-PPh ₂ )] 2a,b, [Ru ₂ Pt(CO) ₆ (dppb)(µ ₃ -η ¹ ,η ¹ ,η ¹ -CC–CCBu ^t )(µ-PPh ₂ )] 2c and [Ru ₄ Ni(CO) ₁₂ (µ-PPh ₂ ) ₂ (µ ₄ -η ¹ ,η ¹ ,η ² ,η ⁴ -Bu ^t CCC ₄ CC-Bu ^t )] 3 resulting from addition of a PtL ₂ fragment and Ni-assisted stoichiometric coupling of two molecules of 1a respectively; the X-ray crystal structures of 2a and 3 are described.