175083-37-1Relevant academic research and scientific papers
(Allyl)zirconium(IV) complexes with the N,N′-bis(trimthylsilyl)benzamidinato ( siam ) ligand - molecular structures and η1-η3 interconversions of the allyl groups
Walther, Dirk,Fischer, Reinald,Friedrich, Manfred,Gebhardt, Peter,Goerls, Helmar
, p. 1389 - 1393 (2007/10/03)
Complexes of the type (siam)2Zr(ailyl)2 (1a) and (siarn)Zr(allyl)nClm are described (2a: n = 1, m = 2; 2b: n = 2, m = 1; 2c: n= 3, m= 0; siam: N,N′-bis|triniethylsilyl)benzaniidinato group). The molecular structure of 1a shows that both allyl groups are differently bonded. One allyl ligand is η3-, the other η1-coordinated. The X-ray crystal structure of the tris-(allyl) complex 2c shows a chiral molecule with two η3-allyl ligands. The third allyl ligand is coordinated in a mode inter-mediate between η3 and η1 thus serving as a model for an intermediate in the η3-η1 intramolecular rearrangement of the ally, ligands observed in solution. Temperature-dependent 1H- and 13C-NiMR spectra of 1a, 2b and 2c indicate a rapid η3-η1 rearrangement of the allyl groups at 60°C. At -50°C two different coordination modes of the ailyl groups can be observed in the case of 2b and 2c. VCH Verlagsgesellschaft mbH, 1996.
