166531-87-9Relevant academic research and scientific papers
Reactions of Ytterbium(II) Amides with Various Broensted Acids, CS2 or LiNR2; Crystal Structures of 2> and (R = SiMe3, thf = tetrahydrofuran)
Hende, Johannes, R. van den,Hitchcock, Peter B.,Lappert, Michael F.
, p. 2251 - 2258 (1995)
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 , while the other Yb-O-C angle is significantly smaller .
