A new ligand environment in organolanthanoid chemistry: sterically hindered, chelating diolato ligands and the X-ray structure of [La{CH(SiMe₃)₂}{1,1′-(2-OC₆H₂Bu^t₂-3,5)₂}(thf)₃](thf = tetrahydrofuran)

Abstract

[La{CH(SiMe3)2}3]1 reacts with 1 equiv. of 3,3′,5,5′-tetra-tert-butylbiphenyl-2,2′-diol 2 to afford the monomeric chelate [La{CH(SiMe3)2}{1,1′-(2-OC6H2But2-3,5)2}]4, whose mono-5, and crystallographically characterised tris-thf adducts 6 have been synthesized; its reaction with 3,3′-bis(triphenylsilyl)-1,1′-binaphthyl-2,2′-diol 3c affords [La{CH(SiMe3)2}{1,1′-(2-OC10H5SiPh3-3)2}(OEt2)]7.