(8b), the first example of a stable 12-1-5 bromoperiodinane. Treatment of alkoxydiaryliodinane 6 with chlorine gave 12-1-5 chloroperiodinane 8a. Treatment of 8b with trifluoromethanesulfonic (triflic) anhydride gave the very stable 10-1-4 periodonium salt la. Treatment of 8b with trifluoroacetic acid gave nearly equal amounts of iodinane 9 and 10-1-4 periodonium trifluoroacetate lb, with oxidation of the bromide to bromine. Reaction with ...