A series of six aryltrifluoromethylketones have been synthesized: 2,3 and 4-pyridyl and N,N-dimethylanilyl-2,3 and 4-trifluoromethylketones. Four of these six aryltrifluoromethylketones form stable gem-diols. It is proposed that the unusual stability of these gem-diols is not solely accounted for by the inductive effects of the trifluoromethyl radical, but also by the stabilization effects of H- bond formation between the acidic OH groups of the diols and their basic N atoms.