| 摘要 |
Title compds. I [ R = H or two substituents(selected from halo, NO2, cyano, CF3, C1-4 alkylamino, C1-4 alkyl), R1 = H or two substituents (selected from halo, NO2, cyano, CF3 alkylamino, alkoxy, OH), which exhibited virucidal activity, were prepd. by different methods. A mixt. of 2'-hydroxy-4-methylchalcone, H3PO4, and MeOCH2CH2OH was refluxed to yield 4'-methylflavanone and clemmensen redn. of the products gave 4'-methylflavan.
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