ortho-Lithiation followed by electrophilic trapping of N-unsubstituted and N2-triphenylmethyl substituted 5-aryltetrazoles, further substituted with another ortho-director at the para position of the aryl ring, resulted in the formation of regioisomers of which the ratio depended on the competing para-substituents. By such intramolecular competition experiments, the ortho-directing strength of these tetrazol-5-yl groups in comparison to ...
