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• W2042274637 abstract "Addition of ethylene to solutions of the bis(cyclometallated) compounds [W(OC6H3PhC6H4)2(L)2] (1, LPMe2Ph; 2, LPMePh2; OC6H3PhC6H4 = cyclometallated 2,6-diphenylphenoxide) produces the η2-ethylene complexes [W(OC6H3PhC6H4)2(L)(η2-C2H4)] (3, LPMe2Ph; 4a, LPMePh2). Addition of α-olefins, RCHCH2 (RPh, SiMe3, CF3) to solutions of 2 produced an equilibrium mixture of 2, free PMePh2 and the corresponding η2-olefin complexes [W(OC6H3PhHC6H4)2(PMePh2)(η2-RCHCH2)] (4b, RPh; 4c, RSiMe3; 4d, RCF3). The solid state structure of the ethylene complex 3 shows a pseudo-octahedral environment about the tungsten metal centre, with mutually trans aryloxide oxygen atoms and mutually cis metallated phenyl rings. The olefin ligand is aligned co-planar with the WP bond, i.e. perpendicular to the OWO axis. The WC (olefin) distances of 2.275(8) and 2.229(8) Å are longer than the WC(phenyl) distances of 2.162(7) and 2.127(8) Å. This, combined with an olefin CC distance of 1.39(1) Å, shows a lack of strong π-backbonding from the tungsten metal centre. In solution, however, restricted rotation about the tungsten-ethylene bond in 3a is observed in the 1H NMR spectrum. The bonding of the olefin ligands in these complexes is discussed." @default.
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• W2042274637 date "1996-07-01" @default.
• W2042274637 modified "2023-10-17" @default.
• W2042274637 title "Isolation of a new series of η2-olefin complexes of tungsten(IV) containing cyclometallated 2,6-diphenylphenoxide ligation" @default.
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• W2042274637 doi "https://doi.org/10.1016/0277-5387(95)00497-1" @default.
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