Three- and four-co-ordinate, hydrocarbon-soluble-aryloxides of scandium, yttrium, and the lanthanoids; X-ray crystal structure of tris(2,6-di-t-butyl-4-methylphenoxo)scandium

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Abstract
Five new classes of crystalline, hydrocarbon-soluble group 3A metal (M) aryloxides are reported: [M(OAr)3], (1), [M(L)(OAr)3][L = tetrahydrofuran (thf) or P(O)Ph3], [M(OAr)2(µ-OAr)2Na(thf)2], Li[Yb(Cl)(OAr)3], and [{Y(Cl)(OAr)(µ-OAr)}2](Ar = C6H2Me-4-But 2-2,6), ranging for (1) from M3+ being the 3d°, 4d°, to the 4fn(n= 0, 1, 2, 3, 9,10, 11, or 13) ion; the title compound (1)(M = Sc) has an approximately trigonal planar ScO3 skeleton (Sc 0.13 Å out of the O3 plane) with av. Sc–O 1.869(15)Å, av. O–Sc–O 119.5(2)°, and av. Sc–O–C 168.4(5)°