1: 2.) n-butyl lithium, 3.) H2O / 1.) CHCl3, 16 h, room temperature, 2.) hexane, reflux, 1.5 h 2: 85 percent / tributyltin hydride / tetrahydrofuran / 3 h / Irradiation View Scheme

n-butyllithium; water 1.) CHCl3, 16 h, room temperature, 2.) hexane, reflux, 1.5 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;