1: 3-iodo-2-methylpropan-1-ol With isopropylmagnesium chloride in tetrahydrofuran T=-78°C; 0.0833333 h; 2: n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.333333 h; 3: cyclohexanone in tetrahydrofuran; hexane T=-78°C; 0.5 h; Further stages.;