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

摘要

The multifunctional ligand bis(diphenylphosphino)-1,9-nonadiyne (1; abbreviated as dpndy) has been prepared by sequential treatment of HC C(CH2) C-5 CH with BuLi and PPh2Cl. Compound 1 reacts with W(CO)(4)(NCMe)(2) to give W(CO)(4)(eta(2)-dpndy) (2), while the reaction of 1 and W(CO)(3)(Me(3)tach) (Me(3)tach = 1,3,5-trimethyl-1,3,5-triazacyclohexane) produces W(CO)(3)(eta(2)-dpndy)(eta(1)-dpndy) ( 3), [W(CO)(3)(eta(2)-dpndy)](2)(mu,eta(2)-dpndy) (4), and the paddle-wheel complex [W(CO)(3)](2)(mu,eta(2)-dpndy) 3 (5). Further treatment of W(CO)(3)(Me(3)tach) with 3 generates the tripodal compound W(CO)(3)[(mu,eta(2)- dpndy) W(CO)(3)(eta(2)-dpndy)](3) ( 6). The molecular structures of 2 and 5 have been determined by an X-ray diffraction study.