n-butyllithium in diethyl ether -78 deg C to rt;

1: 1.) Ti(O-i-Pr)4, i-PrMgCl, 2.) I2 / 1.) ether, -70 deg C to -50 deg C, 2 h, 2.) -50 deg C to rt, 2 h 2: 21 percent / n-BuLi / diethyl ether / -78 deg C to rt View Scheme