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In a manner similar to that described above, 12.0 grams of 3-bromomethyl-3-methyloxetane (73 mmol) was reacted with 26.5 grams of 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctan-1-ol (72.7 mmol) in 300 milliliters of dimethylformamide in the presence of 3.9 grams of a 50 weight percent dispersion of sodium hydride (81 mmol) in mineral oil at 85° C. for 24 hours to give 21.5 grams (70% yield) of 3-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyloxymethyl)-3-methyloxetane, a colorless oil with a boiling point of 66-68° C./2-2.5 mm-Hg; 1H NMR (CDCl3) δ4.50 and 4.36 (AB, J=5.5 Hz, 4 H), 3.78 (t, J=6.6 Hz, 2 H), 3.53 (s, 2 H), 2.42 (triplet of triplets, J=6.6 and 18 Hz, 2 H), and 1.31 (s, 3 H); 13C NMR (CDCl3) δ79.89, 78.30, 63.31, 39.9, 31.64 (t), and 21.1 (signals due to carbons bearing fluorines are not included due to the complex splitting patterns and low peak intensities); 19F NMR δ−81.4 (3 F), −113.8 (2 F), −118.2 (2 F), −112.3 (2 F), −124.1 (2 F) and −126.7 (2 F). The elemental analysis was: Calculated for C13H13F13O2: C, 34.8; H, 2.9; F, 55.1. Found: C, 35.1; H, 3.0; F, 54.7.