9,10,16-Trihydroxypalmitic acid

Composition. Shellac is primarily a mixture of aUphatic polyhydroxy acids in the form of lactones and esters. It has an acid number of ca 70, a saponification number of ca 230, a hydroxyl number of ca 260, and an iodine number of ca 15. Its average molecular weight is ca 1000. Shellac is a complex mixture, but some of its constituents have been identified. Aleuritic acid, an optically inactive 9,10,16-trihydroxypalmitic acid, has been isolated by saponification. Related carboxyflc acids such as 16-hydroxy- and 9,10-dihydroxypalmitic acids, also have been identified after saponification. These acids may not be primary products of hydrolysis, but may have been produced by the treatment. Studies show that shellac contains carboxyflc acids with long methylene chains, unsaturated esters, probably an aliphatic aldehyde, a saturated aliphatic ester, a primary alcohol, and isolated or unconjugated double bonds. 

Stettbacher, Explosivst 1954, 40 7)Schweiz-5prengstoff—Fabtik A-G letter dated Dec 10, 1953 to Dt A. Stettbacher, rich, Switzerland and transmitted to the authors 8) PATR 2510(1958). p Get 3 Aleurltyl Axide, C, H (OH),. CO. N - solid rap-dec on slow heating ca 52 expl when heated rapidly to ca 50 , insol in w petr eth sol in chlf ale and si sol in eth benz. Was prepd by refluxing aleuritic acid (9, 10, 16-trihydroxypalmitic acid), C H,(OH),-... 

Synonyms DL-erytf7ro-9,10,16,-trihydroxyhexadecanoic acid 9,10,16-trihydroxypalmitic acid 8,9,15-trihydroxypenta-decane-1-carboxylic acid. 

Synthetic aleuritic acid 9,10,16-Trihydroxyhexadecanoic acid 9,10,16-Trihydroxypalmitic acid 8,9,15-Trihydroxypentadecane-1 -carboxylic acid... 

See Cyolopentene-3-catboxylic Acid-Aleuritic Add (8 9 l5-Trihydroxypalmitic aeid)... 

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