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The title compound, C 11 H 23 NO 5 P + ·I − , consists of an eight-membered cationic heterocyclic ring in a boat–chair conformation. The ring features a tetra­alkyl­ammonium N and a methyl­phospho­nate P atom. A –CH 2 (CO)OC 2 H 5  ester side chain at the C adjacent to oxygen produces two chiral centers at that substituted C atom and the P atom, both of which were determined to have absolute  R , R  configurations. A previously determined racemic bromide analog has exactly the same ring but with a –C 15 H 31  side chain. In that structure, both chiral centers show the same relative  R / S , R / S  configurations, but the ring in the bromide analog is in a boat conformation.

(2R,4R)-4-(2-Ethoxy-2-oxoethyl)-2,6,6-trimethyl–2-oxo-1,3,6,2λ5-dioxazaphosphocan-6-ium iodide

(2R,4R)-4-(2-Ethoxy-2-oxoethyl)-2,6,6-trimethyl–2-oxo-1,3,6,2λ⁵-dioxazaphosphocan-6-ium iodide