sodium hydride in N,N-dimethyl-formamide T=-60 - 20°C; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

sodium hydride in N,N-dimethyl-formamide T=-60 - 20°C; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: 1) n-butyllithium / 1) THF, cyclohexane, -40 deg C, 2) a) -65 deg C to room temperature, 3h, b) 35 deg C, 20 min 2: 0.197 g / 155 °C View Scheme