Browsing by Author "Rojas Guerrero, Rene Segundo"

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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.
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    Synthesis and structures of homoleptic germylenes and stannylenes with sulfonimidamide ligands
    (2023) Lentz, Nicolas; Sodreau, Alexandre; Acuna, Alejandra; Mallet-Ladeira, Sonia; Maerten, Eddy; Sotiropoulos, Jean-Marc; Rojas Guerrero, Rene Segundo; Madec, David
    An unusual series of germylenes and stannylenes with homoleptic symmetric and unsymmetric N-substituted sulfonimidamide ligands PhSO(NiPr)(NHiPr) 1 and PhSO(NMes)(NHiPr) 2 have been prepared by protonolysis reaction of Lappert's metallylenes [M(HMDS)(2)] (M = Ge or Sn) with two equivalents of the appropriate sulfonimidamide. The homoleptic germylenes [PhSO(NiPr)(2)](2)Ge 3 and [PhSO(NMes)(NiPr)](2)Ge 4, and stannylenes [PhSO(NiPr)(2)](2)Sn 5 and [PhSO(NMes)(NiPr)](2)Sn 6 were fully characterized by NMR spectroscopy and by X-ray diffraction analysis. DFT calculations have been performed to understand the electronic properties brought by the sulfonimidamide ligand.