156762-47-9Relevant academic research and scientific papers
NMR conformational studies of (1,2-bis(diarylphosphino)ethane)(diorgano sulfide)ruthenium complexes
Ohkita, Kenzo,Kurosawa, Hideo,Hirao, Toshikazu,Ikeda, Isao
, p. 179 - 182 (1994)
Some (η5-cyclopentadienyl)(1,2-bis(diarylphosphino)ethane)(diorgano sulfide)ruthenium complexes, 5-C5H5)(Ar2PCH2CH2PAr2)(R1R2S)>BF4 (Ar = Ph, p-Tol; R1, R2 = Ph, Et) were prepared.Variable temperature NMR spectra of these complexes showed the existence of two fluxional processes; inversion at the sulfur atom and δ-λ interconversion of the chelate ring.The former process was slower,and its barriers in these complexes were calculated as ca. 7 kcal mol-1.The spectral features of ethyl phenyl sulfide complexes suggested that substantiation of the new chiral center at sulfur induces a significant conformational rigidity at the chelate ring. Key words: Ruthenium; Sulfide; Nuclear magnetic resonance; Conformation; Diphosphine
