The oligomerization of certain carboxylic acids and alkyl esters derived from natural oils is disclosed. This includes the oligomerization of C.sub.10-17 unsaturated carboxylic acids such as 9-decenoic acid, where the oligomerization yields a mixture of mono-, di- and tri-carboxylic acids. This also includes the oligomerization of certain alkyl esters, including the oligomerization of C.sub.10-17 unsaturated alkyl esters such as methyl 9-decenoate (9-DAME), where the oligomerization yields a mixture of mono-, di- and tri-carboxylic acid esters. Various end use applications for the oligomerized carboxylic acids and oligomerized alkyl esters are also disclosed.
 This invention was made with government support under grant no. DE-EE0002872/001, awarded by the United States Department of Energy. The United States government has certain rights in this invention.