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The synthesis and characterization of a new N-heterocyclic phosphenium cation captured in a six-membered, electron-rich framework is presented. The cation reacts quantitatively with 1 equiv of Wilkinson's catalyst, Rh(PPh 3 ) 3 Cl, to form a cationic rhodium−phosphenium complex, the first to be characterized in the solid state. Computational and X-ray diffraction studies support the existence of a strong dπ−pπ bond between rhodium and phosphorus.
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Spinney et al. (2006) studied this question.
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