The preparation and structural elucidation of uranium (VI) complexes and salts of the phosphorus ylides Ph3PCHCOPh, Ph3PC(COMe)(COPh) and Ph3PCHCOOCH2CH3
摘要:
The reaction in methanol of the phosphorus ylides Ph3PCHCOPh, benzoylmethylenetriphenylphosphorane (BPPY), and Ph3PC(COMe)(COPh), ot-acetyl-ot-benzoylmethylenetriphenylphosphorane (ABPPY) with UO2(NO3)(2) center dot 6H(2)O at 273 K leads to the formation of O-coordinated bis(ylide)-uranium (VI) complexes of the type [UO2(ylide)(2)(NO3)(2)] whereas the reaction of BPPY and UO2(NO3)(2) . 6H(2)O under reflux in benzene yields the salt [H-BPPY](2)(+)[U2O4(NO3)(4)(OH)(2)](2-). The reaction of PhRCHCOOCH2CH3, carbethoxymethylenetriphenylphosphorane (EPPY) with UO2(CH3COO)(2) center dot 2H(2)O produces the salt [H-EPPY]+[UO2(CH3COO)(3)](-). The structures of the free ylides ABPPY and EPPY are also discussed. (c) 2005 Elsevier B.V. All rights reserved.