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Five\u2010 to eight\u2010membered cyclic enones were efficiently synthesized by FeCl<jats:sub>3<\/jats:sub><jats:bold>\u22c5<\/jats:bold>6\u2009H<jats:sub>2<\/jats:sub>O\u2010catalyzed intramolecular cyclization of alkynyl aldehyde acetals in acetone under mild conditions. An oxocarbonium species generated in situ is proposed to initiate the reaction, and the target products are formed via vinylogous carbenium cation and oxete intermediates according to DFT calculations. Intermolecular reactions of alkynes and aldehyde acetals were also investigated with 20\u201340\u2005mol\u2009% FeCl<jats:sub>3<\/jats:sub><jats:bold>\u22c5<\/jats:bold>6\u2009H<jats:sub>2<\/jats:sub>O catalyst, and produced \u03b1,\u03b2\u2010unsaturated enones and chlorinated indene derivatives. 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