Iodo peroxy

Alkenyl halides and trifiates are easily carbonylated. Carbonylation of a-iodo enone 3 proceeded at 60 °C using Pd(OAc)2 and DPPP, and the ester 4 was obtained in 62% yield [6]. The lactam 5 was converted to the vinyl trifiate 6, which was carbonylated to afford the a, -unsaturated ester 7 [7], Carbonylation of the alkenyl iodide 8, possessing a labile peroxy group proceeded smoothly to give the a, -unsaturated ester 9 under 1 atm of CO at 60 °C in DMF. The peroxy group remained intact [8]. 

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