1: C13H19Cl2NO2Si With n-butyllithium; N,N,N',N,-tetramethylethylenediamine T=-78°C; 1 h; 2: N,N-dimethyl-formamide T=-78°C; 1 h; 3: With sodium hydroxide in ethanol T=20°C; 2 h;

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potassium carbonate in N,N-dimethyl-formamide T=55 - 60°C; 4 h;

1: 1.) K2CO3 / 1.) DMF, 50 deg C, 0.5 h, 2.) DMF, 50 deg C 1 h 2: 67 percent / potassium permanganate, n-Bu4NI / H2O; toluene / 8 h View Scheme