American Chemical Society
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Contrasting Reactivities of Silicon and Germanium Complexes Supported by an N‑Heterocyclic Guanidine Ligand

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posted on 2015-02-16, 00:00 authored by Melanie W. Lui, Christian Merten, Michael J. Ferguson, Robert McDonald, Yunjie Xu, Eric Rivard
We report the synthesis of an acyclic two-coordinate germylene supported by two bulky and electron donating N-heterocyclic guanidine [IPrN] ligands (IPr = [(HCNDipp)2C:]; Dipp = [2,6-iPr2C6H3]), and its reactivity with molecular hydrogen to form IPrNH, which presumably proceeds via the unstable intermediate [H2Ge­(NIPr)2]. Our attempts to isolate the corresponding silylene [:Si­(NIPr)2] led to an unexpected ligand activation/rearrangement process involving N–C­(aryl) bond cleavage within the N-heterocyclic guanidine ligand; this transformation was also studied by computational methods.