in tetrahydrofuran byproducts: NaBr; (C6F13Ch2CH2)2SnBr2 hydrolyzed with aq. NaOH in THF (room temp., 2 h);

NaOH in tetrahydrofuran; water aq. soln. of NaOH was added dropwise to soln. of Sn compd. in THF at room temp.; mixt. was stirred for 2 h; concd.; washed (CH2Cl2/H2O, 1/1); dried by pumping;