Bis(4,5-dihydropyrazolyl) ethers 18–22, 26, 27 and 40–44 are obtained in 35–80% yield by heating the corresponding bis(chalcones) 13–17 and 34–37 with each of hydrazine hydrate and phenylhydrazine in refluxing acetic acid.
A. H. M. Elwahy, J. Chem. Res. (S), 1999, 602 DOI: 10.1039/A904716F
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