Investigations into the preparation of groups 13-15 N-heterocyclic carbene analogues |
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| Authors: | Robert J. Baker David P. Mills Glesni A. Pierce |
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| Affiliation: | a Centre for Fundamental and Applied Main Group Chemistry, School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK
b School of Chemistry, Monash University, P.O. Box 23, Vic., 3800, Australia |
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| Abstract: | Attempts have been made to prepare a variety of groups 13-15 N-heterocyclic carbenoid systems. The work in group 13 led to two structurally characterized, paramagnetic gallium(III) heterocycles, [I2Ga{[N(R)C(Me)]2}],  or C6H3(C6H4But-4)2-2,6. Reduction of the former gave the anionic gallium(I) heterocyclic complex, [K(tmeda)][:Ga{[N(Ar)C(Me)]2}], which was oxidatively coupled, affording the structurally characterized digallane(4), [Ga{[N(Ar)C(Me)]2}]2. From group 14, the new germanium(IV) heterocycle, [Cl2Ge{[N(Ar)C(H)]2}], and the N-heterocyclic germylene, [:Ge{[N(Ar)C(H)]2}], have been prepared and fully characterized. Attempts to prepare N-heterocyclic silylene, phosphenium and arsenium compounds were unsuccessful and led instead to the silyl, phosphino and arsino-substituted ene-amines, [(ClnE)2{μ-[N(Ar)C(H)]2}], E = Si, n = 3; E = P or As, n = 2. |
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| Keywords: | Gallium Germanium N-heterocyclic carbenoid Low oxidation state Crystal structure |
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