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The buta-1,3-diyne synthon 1,4-bis(trimethylsilyl)buta-1,3-diyne (1) is an important building block for the introduction of butadiyne motifs into organic and organometallic structures. Although 1 is commonly prepared from the Hay homo-coupling of trimethylsilylacetylene (catalytic CuI/tetramethylethynylenediamine, O2, acetone), the report of a significant explosion during this preparation, likely arising from a static discharge during addition of the catalyst solution to the alkyne/acetone/O2 rich atmosphere, prompts consideration of alternative procedures. Here we report the use of the robust Navale catalyst system (CuI/N,N-dimethylaminopyridine, O2, NCMe) in the multigram-scale preparation of 1 with minimal manipulation of all-glass apparatus, greatly simplifying the process and minimising risks associated with the preparation of this useful compound.

A Safe and Simple Synthesis of 1,4-Bis(trimethylsilyl)buta-1,3-diyne