Synthesis of Ph2PC≡C(CH2) 5C≡CPPh2 ligand and its complexation with tungsten carbonyls to form a dinuclear paddle-wheel and a tetranuclear tripodal compound

Article abstract of DOI:10.1021/om0603722

The multifunctional ligand bis(diphenylphosphino)-1,9-nonadiyne (1; abbreviated as dpndy) has been prepared by sequential treatment of HC≡C(CH₂)₅C≡CH with BuLi and PPh ₂Cl. Compound 1 reacts with W(CO)₄(NCMe)₂ to give W(CO)₄(η²-dpndy) (2), while the reaction of 1 and W(CO)₃(Me₃tach) (Me₃tach = 1,3,5-trimethyl-1,3,5-triazacyclohexane) produces W(CO)₃(η ²-dpndy)(η¹-dpndy) (3), [W(CO)₃-(η ²-dpndy)]₂(μ,η²-dpndy) (4), and the paddle-wheel complex [W(CO)₃]₂(μ,η ²-dpndy)₃ (5). Further treatment of W(CO) ₃(Me₃tach) with 3 generates the tripodal compound W(CO)₃[(μ,η²-dpndy)W(CO)₃(η ²-dpndy)]₃ (6). The molecular structures of 2 and 5 have been determined by an X-ray diffraction study.