Octyl Hydroxamic Acid is an organic compound. Hydroxamic acids are a class of organic compounds. They have the functional group RC(O)N(OH)R’ where R and R’ are organic residues and CO is the carbonyl group. They are amides. They are used extensively for the flotation of rare earth minerals during concentration and extraction of ores. Octyl Hydroxamic Acid is a very useful chemical compound which is made by the reaction of esters or acid chlorides with hydroxylamine salts. Its chemical formula is C9H19NO2.