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Capture of an In Situ Formed Distanna-S-heterocyclic Carbene
Roman Kimmich1, Ralf H Kern1, Markus Strienz1
1Institut für Anorganische Chemie, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
Abstract:
The planar, non-twisted distannene Sn2(TIPS)4 (1, TIPS = SiPr3) reacts with CS2 to form a tetrathiaethylene derivative via the dimerization of two S-heterocyclic carbenes (SHCs). These intermediary-formed SHCs can be transferred to palladium as ligands or captured with B(C6F5)3 (BCF) and, furthermore, facilitate a new pathway for formation of the stannaethene SHC═Sn(TIPS)2 by the reaction of 1 with (PPh3)2Pd-CS2. In addition to the characterization of the new complexes, theoretical calculations of the frontier orbitals were performed, which indicate a high π-acceptor character of the SHC.
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