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Jun 30, 2015 at 11:54 comment added Mithoron @user2246 PCl5first converts OH into OPCl4 and in succesive intramolecular substitution POCl3 acts as very good leaving group.
Oct 15, 2013 at 12:43 comment added user2246 Could you tell me why $\ce{Cl}$ in $\ce{PCl5}$, etc. is a better nucleophile than $\ce{NH3}$ then?
Oct 15, 2013 at 11:34 history answered ssavec CC BY-SA 3.0