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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. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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