Synthesis of a Mixed Phosphonium–Sulfonium Bisylide R3P[DOUBLE BOND]C[DOUBLE BOND]SR2


  • We thank Prof. H. Gornitzka for the X-ray diffraction studies of derivatives 2 and 4. Financial support from the CNRS, LEA-368, NSF (CHE 0518675), and Spanish Ministerio de Educación y Ciencia (CTQ2004-01067/BQU) are gratefully acknowledged. We also thank the French Ministère des Affaires Etrangères (Eiffel grant for M.A.), and Spanish Ministerio de Educación y Ciencia (grant for S.P.).


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Mixing it up: The first persistent mixed phosphorus-sulfur bisylide has been synthesized (see scheme). Its formation was clearly demonstrated by its chemical reactivity, such as by methylation and complexation with CuI ions. DFT calculations on a model compound indicate that they are highly polarized species as a result of the interaction of the lone pairs of electrons on the central carbon atom with only the phosphonium function.