Synthesis of Dimer Standards. Our synthesis of the two dimers formed by an aldol reaction commenced with ozonolysis of (+)-α-pinene [(+)-1] under Schreiber's conditions 47 to deliver dimethylacetal 11, which served as a branch point for stereodivergent access to the diastereomeric aldol adducts 7 and 8 (Figure ). Initial efforts sought to couple 11 with ent-pinonaldehyde (ent-