Abstract:The carbomethoxyhydrazone of 2'-hydroxyacetophenone was trilithiated with excess lithium diisopropylamide and C-acylated with a variety of benzoate esters followed by acid cyclization of the intermediates to 2-(5-aryl-l-carbomethoxy-1H-pyrazol-3-yl)phenols [3-(2-hydroxyphen-y1)-lH-pyrazoles]. The products were characterized by Fourier transform-IR, '€I NMR, 13C NMR, UV-visible absorption and fluorescence. All the derivatives in n-heptane have an absorption maximum at -304 nm and an extremely weak (af = fluores… Show more
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