Phenyl azide 1 and several substituted benzyl azides 2a‐o underwent 1,3‐dipolar cycloaddition reactions with dimethyl acetylenedicarboxylate 3, phenylacetylene 4 and ethyl propiolate 5 to afford the triazoles 6‐13. The reactions of these azides with ethyl propiolate were found to be completely regiospecific.
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Abu‐Orabi et al. (1989) studied this question.
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