Behenic Anhydride: Properties, Handling & Lab Use Guide

Behenic Anhydride is a long-chain symmetric fatty acid anhydride derived from behenic acid (docosanoic acid, C22) that serves as a versatile acylating agent in lipid chemistry, polymer research, and surface-modification applications.

Chemical Name

Docosanoic anhydride (Behenic Anhydride)

Molecular Formula

C44H86O3

Molecular Weight

Approximately 663.16 g/mol

Appearance

White to off-white waxy solid

CAS Number

Verify with product CoA (review flag: confirm CAS)

Solubility

Soluble in warm organic solvents (e.g., chloroform, THF, toluene); practically insoluble in water

Storage Condition

Store in a cool, dry, well-ventilated location away from moisture and strong bases

Chemical Identity and Physical Properties

Behenic Anhydride (docosanoic anhydride) is the symmetric anhydride formed from two molecules of behenic acid (C22:0). Its molecular formula is C₄₄H₈₆O₃ with a molecular weight of approximately 663.16 g/mol. At room temperature it presents as a white to off-white waxy solid consistent with other long-chain fatty acid anhydrides. The elevated melting point relative to shorter-chain analogues reflects strong van der Waals interactions along the C22 alkyl chains.

Behenic Anhydride is practically insoluble in water and cold aliphatic solvents. It dissolves readily in warm chlorinated solvents (e.g., chloroform, dichloromethane), aromatic solvents (toluene, xylene), and polar aprotic solvents such as THF or ethyl acetate when gently heated. Researchers should verify the exact melting point and purity specifications against the Certificate of Analysis (CoA) supplied with each lot.

Key Research Applications

As a reactive acylating agent, Behenic Anhydride is employed across several research domains:

• Lipid and wax synthesis: Behenic Anhydride can introduce the C22 behenoyl group onto hydroxyl- or amine-bearing substrates, enabling the preparation of wax esters, amides, and structured lipids relevant to cosmetic-ingredient research and nutritional lipid studies.
• Polymer and material science: The reagent is used to acylate cellulose, starch, chitosan, and other polysaccharide backbones, imparting hydrophobicity and improving compatibility with non-polar matrices in biopolymer and composite materials research.
• Surface modification: Self-assembled monolayers and surface coatings incorporating long-chain behenoyl groups are investigated for their lubricating, water-repellent, and tribological properties.
• Pharmaceutical and cosmetic ingredient research: Behenic acid derivatives appear in emollient and emulsifier formulations; the anhydride serves as a synthetic intermediate for such compounds.

Note: Specific yield data and reaction conditions should be optimized for each substrate. Review published literature for reaction-specific protocols before use.

Safe Handling, Storage, and Waste Disposal

Personal Protective Equipment (PPE): Wear appropriate chemical-resistant gloves (nitrile or equivalent), safety goggles, and a laboratory coat when handling Behenic Anhydride. Work in a fume hood when heating the material or using it in open solvent systems, as fine particulate dust from the solid and vapors from hot solutions may cause respiratory or mucous-membrane irritation.

Storage: Store in a tightly sealed container in a cool (recommended ≤25 °C), dry, and well-ventilated area. Protect from moisture, strong bases, and strong oxidizing agents. Acid anhydrides hydrolyze slowly in the presence of water, yielding the parent behenic acid; degraded product should not be used in quantitative reactions.

Stability: Behenic Anhydride is stable under recommended storage conditions. However, prolonged exposure to atmospheric humidity will result in partial hydrolysis. Reconfirm purity by melting point or GC analysis if material has been stored for extended periods.

Waste disposal: Dispose of waste material and contaminated solvents in accordance with local, national, and institutional regulations for organic chemical waste. Do not pour into drains or waterways. Consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for complete hazard and disposal information.

Reagent Specification, Purity, and Quality Assurance

Aladdin Scientific supplies Behenic Anhydride (SKU: B151968) for research use. Researchers and procurement professionals should request the Certificate of Analysis (CoA) for each lot to confirm:

• Purity: Confirm by GC or HPLC as stated on the CoA. High-purity grades are recommended for quantitative acylation reactions where stoichiometry is critical.
• Melting point: Consistent melting point is a useful identity and purity indicator for waxy solid reagents; compare against the specification range on the CoA.
• Appearance: The product should be a free-flowing white to off-white solid free from visible discoloration, clumping due to moisture uptake, or off-odor indicative of hydrolysis.
• Lot-to-lot consistency: Request lot-specific CoA data when batch consistency is critical to multi-experiment studies.

For custom purity grades, bulk quantities, or specific analytical test requirements, contact Aladdin Scientific customer support.

Frequently asked questions

What solvents are recommended for dissolving Behenic Anhydride?

Behenic Anhydride dissolves best in warm chlorinated solvents (chloroform, dichloromethane), aromatic solvents (toluene, xylene), or polar aprotic solvents such as THF. Gentle warming (40–60 °C) is typically required due to its waxy solid nature. Water should be avoided as it promotes hydrolysis.

How should Behenic Anhydride be stored to maintain stability?

Store Behenic Anhydride in a tightly closed container at or below 25 °C in a dry, well-ventilated area, away from moisture, strong bases, and oxidizing agents. Exposure to atmospheric moisture causes gradual hydrolysis to behenic acid, reducing reagent activity over time. Verify purity by melting point or GC before use if stored for extended periods.

Is Behenic Anhydride suitable for acylating polysaccharides such as cellulose?

Yes, long-chain fatty acid anhydrides including Behenic Anhydride are used in research for the surface acylation of polysaccharides such as cellulose and starch, imparting hydrophobic character. The reaction is typically performed in the presence of a catalyst (e.g., pyridine or an acid catalyst) at elevated temperatures. Specific conditions should be optimized and validated against published literature for each substrate.

What is the difference between Behenic Acid and Behenic Anhydride?

Behenic Acid (docosanoic acid, C22:0) is a saturated long-chain fatty acid, whereas Behenic Anhydride is the condensation product of two behenic acid molecules with loss of water. As an anhydride, it is considerably more reactive toward nucleophiles (alcohols, amines) than the parent carboxylic acid, making it a preferred acylating agent in synthetic chemistry.

Where can I find the Safety Data Sheet (SDS) for Behenic Anhydride?

The Safety Data Sheet for Behenic Anhydride (SKU: B151968) is available on the Aladdin Scientific product page. You may also request it directly from Aladdin Scientific customer support. Always consult the SDS before handling the reagent to ensure compliance with laboratory safety requirements.

References

1. Gunstone, F. D., Harwood, J. L., & Dijkstra, A. J. (Eds.). The Lipid Handbook, 3rd ed. CRC Press, 2007. (General reference for long-chain fatty acid chemistry.)
2. Klemm, D., Heublein, B., Fink, H.-P., & Bohn, A. Cellulose: Fascinating Biopolymer and Sustainable Raw Material. Angewandte Chemie International Edition, 2005, 44(22), 3358–3393. (Background on polysaccharide acylation research.) doi:10.1002/anie.200460587
3. Aladdin Scientific Certificate of Analysis, Behenic Anhydride, SKU B151968. (Lot-specific purity and physical data; request from supplier.)

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.