1: cyclopentanecarbonitrile With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 0.75 h; 2: diphenyldisulfane in tetrahydrofuran T=-78 - 20°C; 3 h;

sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride

n-butyllithium in tetrahydrofuran; hexane T=-78 - 20°C; 2 h;

1.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 0.08 h / -78 °C 2.1: isopropylmagnesium chloride / tetrahydrofuran; diethyl ether / 0.08 h / -78 °C 2.2: -78 - 20 °C View Scheme