%0 Journal Article %T Synthesis and properties of aromatic 1,3-diketones and bis-(1,3-diketones) obtained from acetophenone and phtalic acids esters %A Jan Zawadiak %A Marek Mrzyczek %A Tomasz Piotrowski %J European Journal of Chemistry %D 2011 %I %R 10.5155/eurjchem.2.3.289-294.416 %X Dibenzoylmethane and six aromatic 1,3-diketones containing a dibenzoylmethane moiety were synthesized from acetophenone and the appropriate ester in crossed-Claisen condensations. The synthesized diketones include derivatives containing carboxyl and ester groups; bis-(1,3-diketones) were also prepared. The absorption of UV radiation of the obtained compounds was investigated in various solvents, and their molar absorption coefficients were calculated. The ratio of tautomers and keto-enol equilibrium constants were calculated using 1H NMR techniques. Aromatic bis-(1,3-diketones) demonstrated strong hyperchromic effects. The keto-enol equilibrium of the investigated compounds is strongly shifted to the enol form, especially in non-polar solvents. %K 1 %K 3-Diketones %K Tautomerism %K Bis-(1 %K 3-diketones) %K UV/Vis spectroscopy %K Solvent effect %K Sunscreens %U http://www.eurjchem.com/index.php/eurjchem/article/view/416