This paper describes the synthesis and reactivity of [η-1,3-(MeSi)CH]U(P-2,4,6-PrCH)(OPMe) (6) which is accessible from a ligand exchange reaction between [η-1,3-(MeSi)CH]U(P-2,4,6-PrCH)(OPPh) (2) and MePO at ambient temperature. Phosphinidene 6 exhibits no reactivity towards internal alkynes, but readily reacts with various hetero-unsaturated molecules such as isothiocyanates, aldehydes, nitriles, isonitriles, and organic azides, forming uranium sulfido, oxido, imido, and uranaheterocyclic compounds. Nevertheless, with the bidentate -dicyanobenzene -CH(CN) the zwitterionic species [η-1,3-(MeSi)CH]U[NHC(N){CHCP(2,4,6-PrCH)CHPMeO}] (13) is isolated in good yield. Moreover, 6 converts with PhS to the uranium(III) phenylthiolate compound [η-1,3-(MeSi)CH]USPh(OPMe) (7) in good isolated yield. Furthermore, the influence of the Lewis base on the reactivity of the uranium phosphinidene metallocenes has also been evaluated.
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