1: N-methoxycarbonyl-2-(3-butenyl)-2-trimethylsilylpyrrolidine With tetra-n-butylammonium tetrafluoroborate in dichloromethane T=-78°C; Electrolysis; 2: allyl-trimethyl-silane in dichloromethane T=-78 - -45°C; 5 h; Further stages.;

1.1: Bu4NBF4 / CH2Cl2 / -78 °C / Electrolysis 1.2: 72 percent / CH2Cl2; diethyl ether / 0.33 h / -78 °C 2.1: Bu4NBF4 / CH2Cl2 / -78 °C / Electrolysis 2.2: 67 percent / CH2Cl2 / 5 h / -78 - -45 °C View Scheme