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5N-alkylation of substituted pyrazoles and pyrazolo[3,4-d]pyrimidines with dimethylformamide diethyl acetal or triethyl orthoformate, Chemistry of Heterocyclic Compounds Study of the reaction of 3,5-diamino-4-carbomethoxypyrazole with acetoacetic ester. Synthesis of pyrazolo[1,5-a]pyrimidine, Chemistry of Heterocyclic Compounds Syntheses, structures, and properties of the Co(II), Ni(II), and Cu(II) complexes with 5-carboxy- and 5-methoxycarbonylpyrazoles, Russian Journal of Coordination Chemistry