The taming of the screw: The CoI-catalyzed cyclotrimerization of triynes and microwave (MW) assisted aromatization with MnO2 are central to the practical synthesis of diazahelicene and azahelicenes. The azahelicene racemates have been resolved, the absolute configuration of the enantiomers assigned, the energy barriers to racemization determined, and X-ray structures of their Ag complexes obtained (see picture; Cp=C5H5, OTf=triflate).
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