Alkylation of lithium trialkylalkynylborates with benzo-1,3-dithiolium fluroborate

Abstract
Lithium trialkylalkynylborates react in a stereoselective fashion with benzo-1, 3-dithiolium fluoroborate to give vinylboranes which on oxidation yield protected 3-oxo-aldehydes and on hydrolysis give protected αβ-unsaturated aldehydes; the hydrolysis is highly selective giving rise eventually to stereospecifically defind αβ-unsaturated aldehydes by a novel process.

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