n-butyllithium 1) in hexane, tetrahydrofuran, -78 deg C, 5 min 2) 0.5 h, -78 deg C, then -10 deg C; Yield given. Multistep reaction. Further byproducts given. Title compound not separated from byproducts;

n-butyllithium 1) in hexane, tetrahydrofuran, -78 deg C, 5 min 2) 0.5 h, -78 deg C, then -10 deg C; Multistep reaction. Further byproducts given. Title compound not separated from byproducts;