1: With zirconocene dichloride; water in dichloromethane T=0°C; 0.5 h; 2: With iodine in tetrahydrofuran; dichloromethane 0.5 h; Further stages.;

hydrogenchloride; Schwartz's reagent; 2,2,6,6-tetramethylpiperidinyl-lithium Yield givenMultistep reaction. Yields of byproduct given. Title compound not separated from byproducts;