Products analyses of the thermolyses of the peroxides CH2= CH-(CH2) n OOtBu, 1,(n= 1-5) showed that an induced decomposition of 1 occured for n= l, 2, 3, 4. Free radical additions of THF, carbon tetrachloride, bromotrichloromethane to 1 have been performed at lower temperature; they allowed, through the isolation of an adduct peroxide, at least in one case for each peroxide, to prove that a two-steps mechanism (addition of radical Z· to the ...