| Sumario: | Treatment of [Au(μ-Cl)(C6F5)2]2 with vinylidenebis(diphenylphosphine), (PPh2)2C=CH2, leads to the complex [Au(C6F5)2Cl{PPh2C(=CH 2)PPh2}]. The coordination of the diphosphine to a gold(III) center strongly activates the carbon-carbon double bond, and this complex, therefore, undergoes Michael-type additions with several carbon-, sulfur-, or oxygen-based nucleophiles. The complexes [Au(C6F5)2{(PPh2) 2CCH2SPh}], [Au(C6F5)2{(PPh2) 2CCH2S2-CNEt2}], and [{Au(C6F5)2{(PPh2) 2CCH2}}2O] have been structurally characterized by X-ray diffraction analysis. They show that the addition has taken place at the terminal carbon atom of the double bond, giving methanide-type complexes. Furthermore, the displacement of the ether molecules in [Au(C6F5)2(OR2)2]ClO 4 (R = Et, iPr) by the diphosphine leads, in a one pot synthesis, to the complexes [Au(C6F5)2{(PPh2) 2CHCH2OR}]ClO4 as a consequence of ether cleavage by water. © 1997 American Chemical Society.
|
|---|
