(11aS)-10,11,12,13-Tetrahydro-5-hydroxy-3,7-di-1-naphthalenyl-5-oxide-diindeno[7,1-de:1′,7′-fg][1,3,2]dioxaphosphocin is a chiral phosphoric acid catalyst for a variety of enantioselective transformations, especially for carbon-carbon and carbon-heteroatom bond-forming reactions.