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902 CHAPTER 21 21.111. In the starting material, the dimethoxybenzyl group is in the “up” position on the chiral carbon, from the perspective drawn. This group thus attacks the carbon of the ,-unsaturated ketone from the top face, pushing the other aromatic ring “down”, so that it ends up cis to the hydrogen on the adjacent chiral center. www.MyEbookNiche.eCrater.com