SEARCH Articles Figures Tables Abstraction nucleophilic Hydrogen abstraction Hydrogen abstraction rings Hydrogen attack Hydrogen nucleophiles Hydrogen protons Hydrogenation protonation Nucleophile Nucleophilic attack Nucleophile attack Nucleophiles attack Nucleophilic Attack on Hydrogen Proton Abstraction) Nucleophilic attack Proton abstracting Proton abstraction Protonated nucleophiles Protons rings Ring hydrogenation