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Thermally-robust bismuthanylstibanes are prepared in a one-step, high yield reaction, providing the first examples of neutral Bi–Sb σ-bonds in the solid state. DFT calculations indicate that the bis(silylamino)naphthalene scaffold is well-suited for supporting otherwise labile bonds. The reaction chemistry of the Bi–Sb bond is exploited by showing insertion of a sulfur atom, providing the first documented example of a Bi–S–Sb bonding moiety.