The Synthesis of 3H-Pyrazol-3-one Derivatives Containing a 9H-Xanthene Ring
2,4-Dihydro-5-methyl-2-phenyl-4-(9H-xanthen-9-yl)-3H-pyrazol-3-one (3) was prepared by the condensation of phenylhydrazine and ethyl α-acetyl-9H-xanthene-9-acetate (2), or 9H-xanthen-9-ol (1) and 2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one (4). 5-Amino
Okabayashi, Ichizo
p. 1339
(2007/10/02)
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