Solubilized Lanthanide Triflates: Lewis Acid Catalysis by Polyether and Poly(ethylene glycol) Complexes of Ln(OTf)<sub>3</sub>
journal contribution
posted on 1998-04-03, 00:00 authored by Helen C. Aspinall, Jennifer L. M. Dwyer, Nicholas Greeves, Edward G. McIver, J. Christopher WoolleyComplexes of lanthanide triflates
Ln(OTf)<sub>3</sub> with polyether
(MeO(CH<sub>2</sub>CH<sub>2</sub>O)<i><sub>n</sub></i>Me)
and poly(ethylene glycol)
(HO(CH<sub>2</sub>CH<sub>2</sub>O)<i><sub>n</sub></i>H)
ligands (<i>n</i> = 2−4) have been prepared and
characterized,
and the activity of these complexes as Lewis acid catalysts has been
investigated. The
complexes
[Ln(OTf)<sub>3</sub>(HO(CH<sub>2</sub>CH<sub>2</sub>O)<i><sub>n</sub></i>H)]
have been shown to catalyze the allylation of a range
of aldehydes with allyltributylstannane, and the complexes
[Ln(OTf)<sub>3</sub>(MeO(CH<sub>2</sub>CH<sub>2</sub>O)<i><sub>n</sub></i>Me)]
catalyze the Diels−Alder addition of
<i>N</i>-crotonyloxazolidinone to cyclopentadiene. The
single-crystal X-ray structures of
[Dy(OTf)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>(MeO(CH<sub>2</sub>CH<sub>2</sub>O)<sub>4</sub>Me)][OTf]
and [La(OTf)<sub>3</sub>(THF)(HO(CH<sub>2</sub>CH<sub>2</sub>O)<sub>4</sub>H)] are
reported.
