Magnesium-promoted reduction of branched alkyl phenyl ketones in the presence of ethyl trifluoroacetate and chlorotrimethylsilane in N,N-dimethylformamide (DMF), followed by air oxidation, and the subsequent treatment of tetrabutylammonium fluoride brought about selective and efficient formation of the corresponding aromatic para-substituted diketones possessing a trifluoroacetyl group in good yields through abnormal addition toward the para positions of the aromatic ketones in good yields.
A simple two‐step sequence allows the conversion of phenyl ketones into p‐trifluoroacetyl derivatives via cross‐coupling with ester (II) followed by desilylation of the mixed acetals.
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