Abstract
Five are too many: It is known experimentally that [(Cp′)2Zr(N2)Zr(Cp′)2] (Cp′=C5H5−nMen) with n=4 activates N2 for hydrogenation, but the complex with n=5 does not. This difference in reactivity arises from the N2 coordination mode (see scheme): For n=0–4, N2 is side-on coordinated—the most suitable mode for hydrogenation—whereas for n=5, N2 is end-on coordinated owing to steric repulsion between five Me groups. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z501371_s.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.
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