Mapping Perfluoroalkyl Effects in Togni-Type Reagents by Thermolysis.

We present the thermolysis of cyclic hypervalent iodine(III) perfluoroalkyl transfer reagents carried out in standard GC-MS instrumentation. Through heating, these structures undergo fragmentation to afford perfluoroalkyl radicals F2n+1 Cn. and each reagent can be characterized by means of a threshold temperature, TIP (n). This parameter TIP (n) not only reflects the stability of the F2n+1 Cn -I bond, but potentially also carries information regarding fundamental properties of the linear perfluoroalkyl chains.