120730-06-5Relevant academic research and scientific papers
Synthesis and Dynamic Nuclear Magnetic Resonance Studies of Co-ordinatively Unsaturated Alkyne Complexes of Tungsten(II)
Carlton, Laurence,Davidson, Jack L.
, p. 2071 - 2076 (1988)
Complexes CR')2>2> react with NaS2PMe2, NaS2CNMe2, or Tl(2-SC5H4N) to give monoalkyne CR')> (R = R'= Me, LL' = S2CNMe2 or 2-SC5H4N; R = Ph, R' = Me, LL' = S2CNMe2 or S2PMe2; R = R' = Ph, LL' = S2PMe2) or bis-alkyne derivatives CPh)2>.Dynamic n.m.r. studies of the monoalkyne complexes reveal fluxional behaviour due to propeller rotation of the co-ordinated alkyne (R = R' = Me, LL' = S2CNMe2 or 2-SC5H4N) whereas with R = Ph, R' = Me or Ph, LL' = S2PMe2 an alternative process attributed to dechelation of the chelate ligand is also observed.The S2PMe2 derivatives react with ligands L = CNBut, PMe2Ph, or P(OMe)3 to give 1:1 adducts CR)(L)> t, PMe2Ph, or P(OMe)3; R = Ph, L =PMe2Ph or P(OMe)3> some of which, L = P(OMe)3, dissociate in solution to give the equilibrium (i). 13C N.m.r. studies of CMe)> are CR)(L)>CR)> + L (i) interpreted in terms of a six-co-ordinate structure containing one monodentate and one bidentate S2PMe2 ligand, rather than a seven-co-ordinate bis-chelate structure.
