1: C14H21BrSi With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 2: 1,5-Diphenylpentan-3-one in diethyl ether; pentane T=-78 - 0°C; 3: in diethyl ether; N,N-dimethyl-formamide; pentane T=80°C; Peterson allenation; Further stages.;

1: C14H21BrSi With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 2: 4-(4-oxocyclohexyl)benzene in diethyl ether; pentane T=-78 - 0°C; 3: in diethyl ether; N,N-dimethyl-formamide; pentane T=50°C; Peterson allenation; Further stages.;

1: C14H21BrSi With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 2: 2-benzyl-3-phenylpropionaldehyde in diethyl ether; pentane T=-78 - 0°C; 3: in diethyl ether; N,N-dimethyl-formamide; pentane T=80°C; Peterson allenation; Further stages.;

1: C14H21BrSi With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 2: benzaldehyde in diethyl ether; pentane T=-78 - 0°C; 3: in diethyl ether; N,N-dimethyl-formamide; pentane T=80°C; Peterson allenation; Further stages.;

1: C14H21BrSi With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 2: cyclohexenon in diethyl ether; pentane T=-78 - 0°C; 3: in diethyl ether; N,N-dimethyl-formamide; pentane T=50°C; Peterson allenation; Further stages.;