2,3,4-pentanetrione gives phenylacetylcarbinol and also methyldyphenylcarbinol. Derivatives Derivatives include 2,3,4-pentanetrione-3-oxime, 2,3,4-pentanetrione-3-(O-methyloxime), 2,3,4-pentanetrione-2-oxime, 2,3,4-pentanetrione-2,3-dioxime, 2,3,4-pentanetrionetrioxime, 2,3,4-pentanetrione semicarbazone, 2,3,4-pentanetrione phenylhydrazone, 2,3,4-pentanetrione bis(phenylhydrazone). The 3-oxime melts at 75 °C and the bis(semicarbazone) has a melting point of 221 °C. References Triketones Conjugated ketones