Abstract
N-Acylsydnone imines, anhydro-4-N-benzoylimino-2,3-diphenylthiazolium hydroxide, and anhydro-4-N-benzoylimino-2,3-diphenyl-1-methylimidazolium hydroxide undergo 1,3-dipolar cycloaddition with dimethyl acetylenedicarboxylate with the formation of substituted pyrazoles, the thiophen and pyrrole, respectively.
Published Version
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