How is azelaic acid made from oleic acid?

The core route: ozone splits oleic acid

The bottom line is that ozonolysis is the established industrial method. Ozone attacks the carbon-carbon double bond in oleic acid, and the fatty acid is cut into two shorter dicarboxylic acids, azelaic acid and pelargonic acid.

The mechanism runs in two stages. Ozone first forms a primary ozonide, and that intermediate, a trioxolane, is then oxidized under oxidative conditions to give the carboxylic acids, as described in a review of azelaic acid as a bio-based building block.

The same review flags the drawbacks. Producing ozone takes high energy and technical demand, and using it carries some potential risks. We did not find detailed plant safety data, so we cannot say how those risks are managed in practice.

Why yields and purity are the real story

Yield numbers look good on paper, but they come with caveats. A pharmacology review lists classical ozonolysis yields of 70 to 95 percent in a summary table, and a US patent for a two-step oxidative ozonolysis reports more than 90 percent of the theoretical amount of both acids. Both are secondary or self-reported figures, not peer-reviewed plant data.

Purity is where the money goes. An azelaic acid synthesis patent notes that feedstock is often about 70 percent pure and that impurities must come out to reach above 98 percent. A separate ozone-free process patent describes prepurifying to more than 75 percent by weight, concentrating to more than 90 percent, and finishing with distillation.

Hydrogen peroxide and enzyme alternatives

The bottom line is that alternatives exist, but none clearly displaces ozonolysis in the sources we checked. One patent on 9-octadecenedioic acid reports pelargonic acid at 82 percent and azelaic acid at 79 percent using a tungsten catalyst with hydrogen peroxide, yet it calls peroxide-based cleavage industrially unattractive because of the stoichiometry.

The sources conflict here. The review's synthetic-route table says an H2O2 route with yields of 80 percent or less was industrialized by Matrica S.p.A. in Italy. We have not resolved that, so treat any claim of current H2O2 production as unverified until you check the company's own disclosures.

The chemo-enzymatic route is the most promising lab result. A chemo-enzymatic study reports high chemical purity without column chromatography, using lipase-generated peracid epoxidation followed by oxidation and H2O2 cleavage. It is a three-step lab process, not a plant process.

What we could not confirm

• We found no peer-reviewed cost, scale, or plant-level yield data for azelaic acid production.
• We did not access the Ullmann's Encyclopedia entry directly, so it appears in this piece only second-hand.
• We did not check pharmacopeial purity specifications for cosmetic or drug-grade azelaic acid.
• The industrial status of hydrogen peroxide routes conflicts across sources and needs verification.

For what azelaic acid does on skin and how it is used, see our topic guide. Production details matter less to most readers than the finished product, but they explain why purity and price can vary between brands.