FLUORINATED TERTIARY ALKOXIDES OF SOME LANTHANIDES - TRIS-TRIFLUOROTERTIARYBUTOXIDES OF LANTHANUM, PRASEODYMIUM AND EUROPIUM

From reactions involving M(N(SiMe(3))(2))(3) (M=La, Pr and Eu) and trifluorotertiary butanol[(CF3)Me(2)COH; tftb.H], the compounds [La(tftb)(3)(thf)(1.5)] (1), [Pr(tftb)(3)]l (2) and [Eu(tftb)(3)] (3) have been isolated. From variable temperature H-1 and F-19 NMR studies it is suggested that 1 is a mixture of [La-3(tftb)(9)(thf)(2)] (1a) and [La-2(tftb)(6)(thf)(4)] (1b). X-ray crystallography has shown that 2 is the trimer [Pr-3(tftb)(9)] and variable temperature H-1 and F-19 NMR suggests that 3 is also a trimer, [EU(3)(tftb)(9)].