Fig. 1: Nucleophilic ring opening of 3-membered phosphorus heterocycles.

a General statements: 3-membered phosphorus heterocycles ring-opening; b Electrophilic phosphonium cations (EPC) as source of inspiration; c Representative examples of polyluorinated organocatalysts refs. 36,37,38; d This work: Ring-opening of Electrophilic Phosphiranium Cations (EPrS) with weak protic nucleophiles.