The perfluoroalkyl chains (−C4F9, −C6F13, −C8F17) were terminally connected to the 5-enopyranose 1, and the 5-enofuranoses 8 and 23 by addition, in the presence of sodium dithionite, of the corresponding homologous perfluoroalkyl iodides to the double bond. Up to six products were separated from each reaction mixture and then fully characterised. The 5-iodo derivatives 9, 10 (prepared from 8), 24,