titanium(IV) isopropylate; hydrogenchloride; iso-propylmagnesium bromide 1.) ether, -78 deg C to -50 deg C, 0.5 h, -50 deg C to -40 deg C, 1.5 h; 2.) ether, -40 deg C to RT, 0.5-1 h; Yield given. Multistep reaction;