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Phenylhydrazine was the first hydrazine derivative characterized, reported by Hermann Emil Fischer in 1875. [7] [8] He prepared it by reduction of a phenyl diazonium salt using sulfite salts. Fischer used phenylhydrazine to characterize sugars via formation of hydrazones known as osazones with the sugar aldehyde. He also demonstrated in this ...
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Phenylhydrazine and 2,4-dinitrophenylhydrazine had been used historically in analytical chemistry to detect and identify compounds with carbonyl groups. Phenylhydrazine was used to study the structure of carbohydrates , because the reaction of the sugar's aldehyde groups lead to well crystallizing phenylhydrazones or osazones .
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Phenazone is synthesized [7] by condensation of phenylhydrazine and ethyl acetoacetate under basic conditions and methylation of the resulting intermediate compound 1-phenyl-3-methylpyrazolone [8] with dimethyl sulfate or methyl iodide. It crystallizes in needles which melt at 156 °C (313 °F).
This handsome prehistoric-looking palm is the most dangerous houseplant on the list for dogs, says Dr. Wismer. Sometimes sago palm is not labeled when you purchase it, but it contains cycasin and ...