Abstract
2-Halomethyl derivatives of phosphonocarboxylic acid esters of the furan series react with acetylacetone, acetoacetic, malonic and cyanoacetic ether in the absolute ethanol–dioxane (1 : 10) medium in the presence of sodium ethylate with the formation of monoalkyl derivatives. Reactions of 3-(furylmethyl)acetylacetone and 2-(furylmethyl)acetoacetate with hydrazine hydrate lead to the formation of phosphorus-containing (furyl)(pyrazolyl)methanes and (furyl)(pyrazolonyl)methanes, respectively. The latter in solutions exist exclusively in hydroxy-form.
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