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The selectivity of the reduction of some trifluoroacetyl-1,3-dioxanes and 1,3-dioxolanes with DIBAH or L-Selectride was studied and compared with that of the corresponding methylketones; the results-in accordance with literature- show an important steric hindrance of the CF 3 group. The selectivity observed in these reductions led to good yields in the syntheses of 5,5,5-trifluorinated derivatives...