153980-27-9Relevant academic research and scientific papers
Synthesis and Reactions of Tungsten(II) Norbornandiene (nbd) Complexes. The Crystal and Molecular Structure of
Carlton, Laurence,Davidson, Jack L.,Vasapollo, Giuseppe,Douglas, Graeme,Muir, Kenneth W.
, p. 3341 - 3348 (2007/10/02)
The reaction of 1 (nbd = norbornandiene) with Tl(C5H5) gave a monocarbonyl derivative 5-C5H5)> 2.With Tl(O2CMe) and Tl, complex 1 gave monosubstituted derivatives 3a and (CO)2(nbd)> 3b which appear to be seven-co-ordinate according to IR data.In contrast 1 and Tl(SC6F5) (1:1 molar ratio) gave the six-co-ordinate complex 4.An X-ray diffraction study of 4 established that it has a distorted-octahedral structure with trans W-CO bonds approximately perpendicular to a plane containing the W, Br and S atoms and the midpoints of the nbd C=C bonds.Simple electronic arguments provide a rationalisation of many of the structural features of 4.Reaction of 1 with 2 molar equivalents of Tl(SC6F5) gave the bis(thiolate) derivative 5 again with a trans arrangement of CO ligands.The reactions of 5 with L = PEt3, PMe2Ph or P(OMe)3 gave the six-co-ordinate complexes 6 which exist in two isomeric forms, red or green.Dynamic NMR studies have been used to characterise the isomeric behaviour and fluxional processes in the complexes.
