silver perchlorate; calcium carbonate in nitromethane T=-15°C; 6 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: diethyl ether / 1.) -78 deg C, 2.) -30 deg C, 2: silver perchlorate, CaCO3 / nitromethane / 6 h / -15 °C View Scheme

1: diethyl ether / 1.) -78 deg C, 2.) -30 deg C, 2: 120 h 3: silver perchlorate, CaCO3 / nitromethane / 6 h / -15 °C View Scheme