Products of the Determination of the Iodine Value with Iodine Monobromide

✍ Scribed by Peter Imming; Oliver Germershaus

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 43 KB
• Volume: 335
• Category: Article
• ISSN: 0365-6233
• DOI: 10.1002/1521-4184(200212)335:9<449::aid-ardp449>3.0.co;2-6

✦ Synopsis

The iodine value (iodine number) is an important analytical characteristic of fats and oils. Leading pharmacopeias determine it using iodine monobromide (Hanus method). We used methyl oleate as a simple analog of unsaturated triacylglycerols to identify the products. After performing the reaction in deuterated solvents under pharmacopeial conditions, NMR spectroscopy revealed the presence of the 9, 10-diiodo, 9, 10-dibromo, and 9, 10-bromoiodo adducts, leaving no educt olefin. The prescribed subsequent addition of potassium iodide led to the formation of methyl 9, 10-diiodo and bromoiodo stearate in equal amounts.