Abstract
One PPh 3 group of CpRu(PPh 3) 2Cl is easily substituted by PPh 2H to give the asymmetrical complex CpRu(PPh 3)(PPh 2H)Cl ( 1) i a very good yield. Attempts to form the λ 4-phosphanediyl complex CpRu(PPh 3)=PPh 2 ( 1′) by selective dehydrohalogenation of 1 failed. However, by using one equivalent of the chelating diphosphine dppa two PPh 3 ligands are substituted to yield CpRu(dppa)Cl ( 2). With an excess of dppa the reaction yielded the N-iminophosphoranyl-substituted dppa complex CpRu(PPh 2) 2NPPh 2NHCl ( 3) and PPh 2H. 1H, 13C 1H and 31P 1H NMR, IR and mass spectra of 1–3 are given. Crystals of 1 are monoclinic, space group 0793 P2 1/c with a=11.8446(12) b=14.502(3), c=17.504(2) A ̊ and β=95.55(9)°, Z=4 and R=0.0270 for 4299 observed reflections. Crystals of 2 are monoclinic, space group P2 1/ c with a = 10.7616(14), b = 18.263(4), c = 13.859(2) A ̊ and β = 110.41(1)°, Z = 4 and R = 0.0327 for 4227 observed reflections.
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