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Reactions of Ytterbium(II) Amides with Various Broensted Acids, CS2 or LiNR2; Crystal Structures of 2> and (R = SiMe3, thf = tetrahydrofuran)

DOI: 10.1039/DT9950002251

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2251 - 2258 (1995)

Update date:2022-07-30

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Authors:

Hende, Johannes, R. van denHende, Johannes, R. van den

Hitchcock, Peter B.Hitchcock, Peter B.

Lappert, Michael F.Lappert, Michael F.

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Article abstract of DOI:10.1039/DT9950002251

The reactions of <2> I or II (R = SiMe3) with various Broensted acids, carbon disulfide or LiNR2 with N,N,N',N'-tetramethylethylenediamine (tmen) afforded the following complexes: (a) <2> 1 from I and 2 (t-Bu)3COH; (b) <2> 2 and 3 from I and 4 (t-Bu)3COH in hexane or tetrahydrofuran (thf), respectively; (c) <x> 4a (R' = C6H2(t-Bu)2-2,6-Me-4) from 1 and 2 HOR'; (d) 4b from 4a and an excess of thf; (e) 4c from 4b and an excess of pyridine (py); (f) Yb(O3SCF3)2(dme) 5 (dme = 1,2-dimethoxyethane) from II and 2 HO3SCF3; (g) 6 from I and 4 Htmhd(<*>(t-Bu)COCH2CO(t-Bu); (h) Yb(S2CNR2)2 7 from II and 2 CS2; and (i) (tmen)> 8 from II, LiNR2 and tmen.A single-crystal X-ray diffraction study established 1 to be dimeric with asymmetrically bridging (1-)OC(t-Bu)3 ligands.In this molecule the four-membered Yb2O2 ring has a fold angle of 24 deg about the O(1)...O(2) direction, reducing the steric strain between adjacent bulky groups by bringing the two NR2 groups slightly above the plane.Complex 3 is monomeric with alkoxo and the tetrahydrofuran ligands in a distorted-tetrahedral configuration about the ytterbium.One of the alkoxo ligands is bound in a conventional way with the Yb-O-C angle almost linear <175(2) deg>, while the other Yb-O-C angle is significantly smaller <155(3) deg>.

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Product name:[Yb(OCBu(t)3)(2,6-di-tert-butyl-4-methylphenolate)]x

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