Phototriggered Active Alkyne Generation from Cyclopropenones with Visible Light-Responsive Photocatalysts.

A photocatalytic active alkyne generation reaction was developed using cyclopropenone as a starting reagent. Visible light-responsive photocatalysts induced cyclopropenone decarbonylation. The resulting highly reactive alkyne could be used directly, without isolation, for further reactions, such as in a dehydration condensation reaction and alkyne-azide click chemistry.