Fig. 1: Hydroacylation of alkynes.

Previous works: aldehyde-alkyne coupling, a Intramolecular organocatalytic approach and b C–H activation approach. c) This work: nondirected and aldehyde-free approach.

Previous works: aldehyde-alkyne coupling, a Intramolecular organocatalytic approach and b C–H activation approach. c) This work: nondirected and aldehyde-free approach.