- Preparation method 8 -hydroxy -2, 2, 14 and 14 -tetramethyl-pentadecanedioic acid
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The invention relates to a preparation method of 8 - hydroxyl -2, 2, 14 and 14 -tetramethyldodecanedioic acid. The method utilizes isobutyronitrile (II) and 1, 4 - dihalogenated butane as raw materials to obtain 2, 2 -dimethyl -6 -halogenated n-hexanenitrile, then with 1, 3 -di P-substituted acetone (substituent P) COOR. CN Or CONH2 Through substitution reaction, hydrolysis, acidification and decarboxylation, 8 - oxo -2, 2, 14, 14 - tetramethyldodecanedioic acid, and a boric acid reducing agent are subjected to reduction reaction, and then hydrolyzed and acidified to obtain a target product. To the invention, isobutyronitrile is adopted as an initial raw material, and raw materials are cheap and easily available. Easy operation, reaction conditions easily realize. The system is safe, environment-friendly and small in wastewater generation amount. The method has the advantages of low cost, high reaction selectivity, less byproducts, high target product yield and purity and suitability for green industrial production.
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Paragraph 0059-0064; 0076-0077; 0089-0091
(2021/12/07)
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