Reduction of [ThCp",CI2] [Cp" = ~l -c ~H ~( S i M e ~) ~]with Na-K in PhMe yields [ T ~C P " ~] , which is monomeric in the solid state, as determined by X-ray crystallography, and is the first crystalline tri-q-cyclopentadienylmetal complex, 2.80(2) A.
Reduction of [UCp'f2X2] [Cp" = r ~-C ~H ~( s i M e ~) ~; X = CI, Br, o r I] or [ { U C P " ~( ~~-B F ~) ( ~~-F ) } ~]with Na/Hg in toluene yields the lipophilic (and n.m.r. characterisable) compounds [{UCp"2X},] (X = F, CI, Br, or I), which are versatile precursors to uranocene (111 or IV) compounds; X-ray data on the chloro-and bromo-derivatives reveal them to be the first uranocene(iit) halide dimers (i.e., n = 2, with p X -) .
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