AcOCH2CHICH2(CF2CF2)nCH2CHI–CH2OAc (2a–2b) has been developed. The primary bis-adducts 2a–2b suffered a subsequent rearrangement in the addition mixture to afford semi-rearranged adducts AcOCH2CHICH2–(CF2CF2)n–CH2CH–(OAc)CH2I (3a–3b) in an amount of ca. 15% rel. at reaction temperatures. Both adducts 2a–2b and rearranged adducts 3a–3b were converted to diepoxides CH2(–O–)CHCH2(CF2CF2)nCH2CH–(–O–)CH2 (4a–4b) with high