Complexes of lanthanide triflates Ln(OTf) 3 with polyether (MeO(CH 2 CH 2 O) n Me) and poly(ethylene glycol) (HO(CH 2 CH 2 O) n H) ligands ( n = 2−4) have been prepared and characterized, and the activity of these complexes as Lewis acid catalysts has been investigated. The complexes [Ln(OTf) 3 (HO(CH 2 CH 2 O) n H)] have been shown to catalyze the allylation of a range of aldehydes with allyltributylstannane, and the complexes [Ln(OTf) 3 (MeO(CH 2 CH 2 O) n Me)] catalyze the Diels−Alder addition of N -crotonyloxazolidinone to cyclopentadiene. The single-crystal X-ray structures of [Dy(OTf) 2 (H 2 O) 2 (MeO(CH 2 CH 2 O) 4 Me)][OTf] and [La(OTf) 3 (THF)(HO(CH 2 CH 2 O) 4 H)] are reported.
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Aspinall et al. (1998) studied this question.
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