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Article Dans Une Revue Dalton Transactions Année : 2010

Easy access to uranium nucleophilic carbene complexes

Résumé

Metathesis reactions of UCl4 with Li2C(Ph2PS)2 in Et2O only afforded the tris-carbene complex [{Li(OEt2)}2U{[double bond, length as m-dash]C(Ph2PS)2}3] (1), while the bis- and mono-carbene compounds [U{[double bond, length as m-dash]C(Ph2PS)2}2(THF)2] (2) and [{Li(THF)2}2U{[double bond, length as m-dash]C(Ph2PS)2}Cl4] (3) were obtained by treatment of UCl4 with Li2C(Ph2PS)2 in a mixture of THF and toluene. The bis-carbene complex 2 was also obtained either from the comproportionation reaction of 1 and UCl4 or protonolysis reaction of U(NEt2)4 with H2C(Ph2PS)2 and was transformed into the mono-carbene complex [U{[double bond, length as m-dash]C(Ph2PS)2}Cl2(THF)2] (4) by further reaction with UCl4. The utility of these complexes as precursors is illustrated by the synthesis of the biscyclopentadienyl derivative [Cp2U{[double bond, length as m-dash]C(Ph2PS)2}] (5) by treatment of 3 with TlCp. The crystal structures of [U{[double bond, length as m-dash]C(Ph2PS)2}2(py)2]·1.5py·0.5THF and 5·toluene are reported.

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Dates et versions

hal-00577186 , version 1 (16-03-2011)

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Jean-Christophe Tourneux, Jean Claude Berthet, Pierre Thuéry, Nicolas Mézailles, Pascal Le Floch, et al.. Easy access to uranium nucleophilic carbene complexes. Dalton Transactions, 2010, 39 (10), pp.2494-2496. ⟨10.1039/B926718M⟩. ⟨hal-00577186⟩
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