Browsing by Author "Saffon-Merceron, Nathalie"

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    Lewis Base Adducts of Phosphine-Stabilized Pb(II) Cations: Synthesis and Catalytic Hydroamination of Alkynes
    (2022) Chandran, Aswin; Baeza, Jose Miguel Leon; Timofeeva, Vladislava; Nougue, Raphael; Takahashi, Shintaro; Ohno, Ryoma; Baceiredo, Antoine; Guerrero, Rene Segundo Rojas; Syroeshkin, Mikhail; Matsuo, Tsukasa; Saffon-Merceron, Nathalie; Kato, Tsuyoshi
    Phosphine-stabilized Pb(II) cations, generated by chloride abstraction from chloroplumbylene 1, readily react with Lewis bases (L) such as phosphines and amines to give the corresponding donor-acceptor complexes 3. These complexes 3 react with phenylacetlylene via alkyne insertion into the Pb-L bond to afford the corresponding vinylplumbylenes 4. Of particular interest, the stable complex 4-HNiPr2 (with a secondary amine) can be used as a hydroamination catalyst of phenylacetylene.
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    Reductive Elimination at Pb(II) Center of an (Amino)plumbylene-Substituted Phosphaketene: New Pathway for Phosphinidene Synthesis
    (2022) Timofeeva, Vladislava; Leon Baeza, Jose Miguel; Nougue, Raphael; Syroeshkin, Mikhail; Rojas Guerrero, Rene Segundo; Saffon-Merceron, Nathalie; Oezpinar, Gul Altinbas; Rathjen, Saskia; Mueller, Thomas; Baceiredo, Antoine; Kato, Tsuyoshi
    A stable (amino)plumbylene-substituted phosphaketene 3 was synthesized by the successive reactions of PbCl2 with two anionic reagents (lithium amidophosphine and NaPCO). Of particular interest, the thermal evolution of 3, at 80 degrees C, leads to the transient formation of corresponding amino- and phosphanylidene-phosphaketenes (6 and 7), via a reductive elimination at the Pb-II center forming new N-P and P-P bonds. Further evolution of 6 gives a new cyclic (amino)phosphanylidene phosphorane 4, which shows a unique reactivity as a phosphinidene. This result provides a new synthetic route to phosphinidenes, extending and facilitating further their access.