The composition of fractions of shale oil water-soluble phenols boiling in the range of 295-340 degrees C has been studied. It has been shown that 5-alkylresorcinols with 2 to 8 carbon atoms in the side chain boil in the range of 315-340 degrees C. The bactericidal properties of the latter in detergent compositions have also been investigated. The minimum required bactericidal concentrations of 5-alkylresorcinols in detergent compositions have been determined.