-Difluorination of carbon-carbon triple bonds using Brønsted acid/BuNBF or electrogenerated acid.

-Difluorination of carbon-carbon triple bonds was conducted using Brønsted acids, such as TfNH and TfOH, combined with BuNBF as the fluorine source. The electrochemical oxidation of a BuNBF/CHCl solution containing alkyne substrates could also give the corresponding -difluorinated compounds ( method). The electrolysis method was also applicable for -difluorination of alkynes.