| 摘要 |
PURPOSE:To industrially obtain the title polyfluorobenzyl alcohol with excellent yield and selectivity by using a solid metal or a solid alloy as a cathode, and electrolytically reducing polyfluorobenzoic acid in the electrolyte consisting of an aq. sulfuric acid soln. CONSTITUTION:A solid metal such as zinc and lead or a solid alloy such as zinc amalgam or lead amalgam is used as the cathode, the electrolyte consisting of an aq. sulfuric acid soln. contg. 1-90wt.%, or preferably 2-70wt.%, sulfuric acid is prepared, and a trace amt. of an onium salt is added, as required, to the electrolyte as a catalyst. The polyfluorobenzoic acid expressed by formula I (e.g., 2,3,5,6-tetrafluorobenzoic acid) is electrolytically reduced in the prepared electrolyte to obtain the polyfluorobenzyl alcohol shown by formula II (e.g., pentafluorobenzyl alcohol). In addition, a water-soluble org. solvent is preferably incorporated into the electrolyte to increase the yield, current efficiency, etc., of the polyfluorobenzyl alcohol.
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