1: 98 percent / 5,5-dimethyl-2-oxo-2-chloro-1,3,2-dioxaphosphorinan / pyridine 2: 70percent perchloric acid, trifluoroacetic acid / CH2Cl2 / 0.5 h / 0 °C View Scheme

pyridine; 5,5-dimethyl-2-oxo-2-chloro-1,3,2-dioxaphosphorinane; water; iodine 2.) 5 min; Yield given. Multistep reaction;