A method was developed to follow the hydroxylation of rapeseed oil and erucic acid derivatives with peracetic acid. Peracetic acid prepared insitu was found to be equally as effective as the preformed acid in hydroxylation of methyl erucate. Among the compounds synthesized were ethyl 13,14-dihydroxybehenate, methyl 13,14-oxidoerucate, ethyl 13,14-diacetoxybehenate, and methyl 13,14(14,13)-hydroxyacetoxybehenate which were subsequently pyrolyzed at approximately 300 °C with p-toluenesulphonic acid as catalyst. The first compound yielded mainly the corresponding ketone with a small amount of the oxido derivative, the chief product of the second compound was also the ketone with some unsaturated material, the third compound yielded 43% of the diene, while the last one yielded 60%. Ammonolysis of the oxido compound or the bromohydrin to yield the corresponding aminohydroxy derivative under pressure with liquid ammonia and ammonium bromide was unsuccessful. A new compound oxidoerucamide, m.p.101.5°, was synthesized.