ChemInform Abstract: N‐Heterocyclic Carbene—Copper‐Catalyzed Group‐, Site‐, and Enantioselective Allylic Substitution with a Readily Accessible Propargyl(pinacolato)boron Reagent: Utility in Stereoselective Synthesis and Mechanistic Attributes. Issue 2 (23rd December 2015)