Journal
TETRAHEDRON LETTERS
Volume 43, Issue 17, Pages 3137-3139Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(02)00490-2
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ortho-Lithiation followed by electrophilic trapping of N-unsubstituted and N2-triphenylmethyl substituted 5-aryltetra-zoles, 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 some commonly employed ortho-directors were found to be: OMe<1H-tetrazol-5-yl<2-(triphenymethyl)-2H-tetrazol-5-yl
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