Is catalytic hydrogenation protic or aprotic? Because I forget. And if our reduction is not stereo specific then how can our product be enantiomerically pure? I mean is 1-phenyl-1-hydroxy-2-methyl-amino propane containing of course chiral centers at carbons number 1 and 2 on the propane chain, then reduction to methamphetamine eliminates WHICH chiral center is it again?