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<p><b>Asymmetric hydrogenation</b> is a <a href="page.php?w=chemical_reaction">chemical reaction</a> that adds two atoms of <a href="page.php?w=Hydrogen_atom">hydrogen</a> to a target (substrate) molecule with three-dimensional <a href="page.php?w=Enantioselective_synthesis">spatial selectivity</a>.  Critically, this selectivity does not come from the target molecule itself, but from other <a href="page.php?w=reagents">reagents</a> or <a href="page.php?w=catalysts">catalysts</a> present in the reaction. This allows spatial information (what chemists</p><p>
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