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Titolo:
Pinwheel-shaped heterobimetallic lanthanide alkali metal binaphtholates: Ionic size matters!
Autore:
Aspinall, HC; Bickley, JF; Dwyer, JLM; Greeves, N; Kelly, RV; Steiner, A;
Indirizzi:
Univ Liverpool, Dept Chem, Donnan & Robert Robinson Labs, Liverpool L69 7ZD, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 7ZD, Merseyside, England
Titolo Testata:
ORGANOMETALLICS
fascicolo: 25, volume: 19, anno: 2000,
pagine: 5416 - 5423
SICI:
0276-7333(200012)19:25<5416:PHLAMB>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATALYTIC ASYMMETRIC-SYNTHESIS; ALPHA-AMINO PHOSPHONATES; BINOL COMPLEXES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Aspinall, HC Univ Liverpool, Dept Chem, Donnan & Robert Robinson Labs, Liverpool L69 7ZD, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 7ZD England
Citazione:
H.C. Aspinall et al., "Pinwheel-shaped heterobimetallic lanthanide alkali metal binaphtholates: Ionic size matters!", ORGANOMETAL, 19(25), 2000, pp. 5416-5423

Abstract

Anhydrous alkali metal lanthanide binaphtholates Ms[Ln(binol)(3)] (M = Li,Na; Ln = lanthanide or yttrium; H(2)binol = binaphthol) are prepared by reaction of [Ln{N(SiMe3)(2)}(3)] with 3 equiv of MHbinol. Reaction of [Ln{N(SiMe3)(2)}(3)] (Ln = Y or Yb) with 3 equiv of rac-LiHbinol gives a racemic mixture of RRS- and SSR-Li-3[Ln(binol)(2)](2) as the only product. In contrast, reaction of [Ln{N(SiMe3)(2)}(3)] with 3 equiv of rac-NaHbinol gives a racemic mixture of RRR- and SSS-Na-3[Ln(binol)(3)] when Ln = Y. When Ln =Yb,a 3:1 mixture of RRR-/SSS- and RRS-/SSR-Na-3[Ln(binol)(3)] is formed. Complexes have been characterized in solution by NMR spectroscopy. The S-protonof the unique binol ligand in RRS- and SSR-Li-3[Y(binol)(3)] is shifted upfield by interaction with the pi -system of a neighboring naphthyl ring. Analysis of paramagnetically induced H-1 NMR shifts of Yb complexes shows them to be entirely dipolar in origin. X-ray crystal structures have been determined for the following compounds: rac-[Li(THF)(2)](3)[Y(binpl)(3)].THF, 2a; rac-[Na(THF)(2)](3)[Y(binol)(3)], 3; [Li(OEt2)](3-)[Eu(S-binol)(3)] .[Li(OEt2)](3)[Eu(S-binol)(3)(H2O)].2Et(2)O, 4; [Li(THF)(2)](2)[Li(OEt2)][Yb(S-binol)(3)]. THF, 5; [Na(THF)(2)](3)[Yb(S-binol)(3)], 6; [Na(THF)(2)](3)[La(S-binol)(3)(H2O)], 7.

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Documento generato il 02/12/20 alle ore 08:17:00