Compositions comprising a physiologically-active agent and a compound represented by general formula (I), wherein R<1> and R<2> are independently selected from the group consisting of alkyl and cycloalkyl radicals comprising from 1 to 20 carbon atoms and R is selected from the group consisting of alkyl and cycloalkyl radicals comprising from 1 to 30 carbon atoms; provided, however, that the total number of carbon atoms in said compound is 15 or more and the total number of carbon atoms in R<1> and R<2> is 5 or more. Other subject compositions relate to an improved method of dyeing fibers, improved delivery of plant nutrients, improved plant pest control, improved delivery of plant growth regulators, improved acid-catalyzed conversion of a reactant into a reaction product and an improved insect repellant.
