Synthesis of 6-N-Pentadecyl -8-hydroxyquinoline from cardanol

Abstract

In this research, the fluorescence marker for diesel oil was synthesized from cardanol, which was obtained from cashew nut shell liquid. The synthesis of 8-hydroxyquinoline was performed as a model synthetic pathway for the synthesis of 6-n-pentadecyl-8-hydroxyquinoline from cardanol. The resulting 6-n-pentadecyl-8-hydroxyquinoline (8) exhibited high solubility in diesel fuel and common organic solvents. When added into diesel fuel at the concentration of 2–5 ppm, compound 8 could not be applied as fluorescence marker in diesel fuel due to the quenching phenomenon with diesel fuel. However, compound 8 was used as chelating agent for chromium (III) ions in water. Complex of Cr (III) with compound 8 was extracted with chloroform and detected by UV-Vis spectroscopy at λmax 407 nm. It was found that compound 8 could be used as a reagent for quantitative determination of chromium (III) ion by using UV-Vis technique in a similar manner as that using 8-hydroxyquinoline.