A Novel Efficient Route for Acid-Catalyzed Synthesis of ,-Alkynyl/Alkenyl Ketones. -Although aliphatic alkynes form alkynyl ketones using AgOTf/TfOH as the catalyst, no alkenyl ketones are observed with catalytic amounts of TfOH. The same accounts for the transformation of the 4-fluorophenyl substituted compound (X). The conversion of (IV) with nitro and fluoro acetylene in the presence of AgOTf/TfOH as the catalyst yields only trace amounts of products. -(ZHANG*, X.; XU, X.; YU, L.; WANG, Z.; ZHAO, Q.; Synlett 25 (2014) 16, 2370-2374, http://dx.