Expedient, Direct Synthesis of (L)Pt(0)(1,6-diene) Complexes from H<sub>2</sub>PtCl<sub>6</sub>
作者:Guillaume Berthon-Gelloz、Jean-Marc Schumers、Fabio Lucaccioni、Bernard Tinant、Johan Wouters、István E. Markó
DOI:10.1021/om7007088
日期:2007.11.1
The one-pot synthesis of useful [Pt-2(0)(eta(4) -1,6-diene)3] complexes, directly from H2PtCl6 center dot xH(2)O, has remained an unaddressed problem. We have found that the treatment of an i-PrOH solution of H2PtCl6 center dot xH(2)O by (Me3SiO)(2)MeSi(CH=CH2), in the presence of allyl ether (AE), followed by reaction of the in situ generated Pt(0) species with IPr carbene (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) enables the isolation of (IPr)Pt(AE) (1) in 50-70% yield. The scope of this method has been extended to other (L)Pi(1,6-diene) complexes (L = 1,3-dicyclohexylimidazol-2-ylidene, triphenylphoshine; 1,6-diene = diethyl 2,2-diallylmalonate (DAM)), and the molecular structure of the (IPr)Pt(DAM) (4) complex has been unequivocally determined by a single-crystal X-ray diffraction analysis. These results are significant for the formation of active L-Pt(0) fragments in catalysis.