[BMIm]BF4-LiCl as an effective catalytic system for the synthesis of dicoumarols

A homogeneous ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate doped with LiCl([BMIm]BF4-LiCl) was found as catalyst solvents for the synthesis of dicoumarols by thecondensation of 4-hydroxycoumarin and aldehyde at 80 ˚C. In this field, several types ofaromatic aldehyde, containing electron-withdrawing groups as well as electron-donating groups,were rapidly changed to the corresponding derivatives in good to excellent yields. Application ofthis new homogeneous catalyst system offered the advantages of short reaction times, solventfreeconditions, high yields, and easy work-up procedure compared to the conventional methodsof the syntheses. The ionic liquid can be recovered for the subsequent reactions and reusedwithout any loss of efficiency.

کلیدواژه ها:

Homogeneous catalyst ، 4-hydroxycoumarin ، ionic liquid ، dicoumarols