Formation and Structure of a Platinum(II) Complex Containing TwotransNonstabilized Phosphorus Ylide Ligands: Evidence for Reversible Ylide Dissociation
Abstract:The reaction of (nBu4P)2[PtBr4] with 2,2'-(C6H4Li)2 yields selectively (by 195 Pt and 31 P NMR) compound trans-PtBr2[CH(nPr)(PnBu3)]2 as a mixture of meso (R,S) and dl (R,R+S,S) diastereoisomers. The initially formed 1:1 mixture slowly evolves toward a solution richer in the meso compound, which then crystallizes selectively. In addition to the NMR characterization, the meso isomer has also been characterized by a single crystal X-ray diffraction analysis. DFT calculations in the gas phase and in solution (THF… Show more
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