Chemistry of substituted pyrazolo[1,5-a]pyrimidines. Part 5. 7-Oxo-6-[pyrazol-3′(5′)-yl]-4,7-dihydropyrazolo[1,5-a]pyrimidines from 6-ethoxycarbonyl-7-(2-dimethylaminovinyl)pyrazolo[1,5-a]-pyrimidines: elucidation of the reaction mechanism through NMR spectroscopy and X-ray diffraction analysis
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