Synthesen und Struktur von Diborylacetylenen

Syntheses and Structure of Diborylacetylenes Reactions of bis(trimethylstannyl)acetylene with 2-chloro-1,3,2-benzodioxaborole derivatives or 9-chloro-9-borabicyclo[3.3.1]nonane lead to the corresponding diborylacetylenes 1a, b and 2. Sodium acetylide reacts with R1R2BCl to give R1R2BC1 (3a, b), which are converted to R1R2BC1R1R2 (4a, b) by lithiation and subsequent treatment with more R1R2BCl (R1=iPr2N, R2=iPr2N or tBu). X-Ray structure analyses are performed for 1a, 4a, and 4b.

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