Cholesteryl esters of furocoumarin and coumarin carboxylic acids

Cholesteryl eaters of angelicin and psoralen carboxylic acids have been pre pared by condensation of o-acetyl(hydroxy)coumarins with cholesteryl chloro acetate in acetonitrile in presence of potassium carbonate. Attempts to pre pare these esters starting from furocoumarin carboxylic acids turned to be unsuccessful. Cholesteryl ester of 2-(4-methyl-7-coumarinyloxy)butanoic aci d has been prepared via alkylation of the acid by cholesteryl tosylate. The resulted cholesteryl esters form thin films fitted for the Langmuir techno logy.