The Wolff-Kishner reduction of the half-protected ketal calix[4]monoquinone 3 and its basic hydrolysis product 4 produced a partially reducing product 5. When the same reduction conditions were applied to the calix[4]quinone benzoates 1 and 2, the corresponding title compounds, p-hydroxycalix[4]arenes (6 and 7), were afforded in one step.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY Volume: 51 Issue: 3 Pages: 607-611