titanium(IV) isopropylate; alpha,alpha-dimethylbenzyl hydroperoxide; (+)-Weinsaeure-diethylester 1.) CH2Cl2, -38 deg C, 1 h, 2.) CH2Cl2, -38 deg C, 30 min then -30 deg C, 40 h; Yield given. Multistep reaction. Further byproducts given. Yields of byproduct given;