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It's all in the preparation: Heterogeneous asymmetric catalysts based on two homochiral highly porous metal–organic frameworks formed from the same building blocks show remarkably different activity. Although both catalysts are based on twofold interpenetrated structures, one catalyzes the addition of diethylzinc to aromatic aldehydes with high enantioselectivity (up to 90 % ee), while the other is inactive. Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂002/2007/z602099ₛ. pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Wu et al. (2006) studied this question.