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    • 2. 发明授权
    • Process for the production of cyclic diesters of dodecanedioic acid
    • 十二烷二酸的环状二酯的制备方法
    • US4157330A
    • 1979-06-05
    • US867566
    • 1978-01-06
    • Joern RueterKlaus BurzinKarl-Heinz MagoschRoland Feinauer
    • Joern RueterKlaus BurzinKarl-Heinz MagoschRoland Feinauer
    • C07D321/00
    • C07D321/00
    • Cyclic esters of dodecanedioic acid with aliphatic diols of 2-12 carbon atoms in the chain and substituted by up to two alkyl of 1-4 carbon atoms, are produced by thermolysis of corresponding linear polyesters under reduced pressure in the presence of catalysts by subjecting the linear polyesters to thermolysis at temperatures between 200.degree. and 300.degree. C., and by utilizing as catalyst a tin(II) salt of an aliphatic monocarboxylic acid of up to 18 carbon atoms, of an aromatic or araliphatic monocarboxylic acid of up to 36 carbon atoms, of an aliphatic or aromatic hydroxy-, poly-, ketocarboxylic acid or of a dicarboxylic acid of up to 18 carbon atoms; or a mixture of an organotin compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are alkyl of 1-18 carbon atoms, or aryl or aralkyl of 6-36 carbon atoms, and an O,O-dialkyl-(3,5-di-tert.-butyl-4-hydroxybenzyl)-phosphonate wherein each alkyl is of 2-18 carbon atoms.
    • 通过在催化剂存在下,通过在减压下热解相应的线型聚酯,在链中存在十二烷二酸与链中2-12个碳原子的脂肪族二醇并被至多两个1-4个碳原子的烷基取代的环酯, 线性聚酯在200-300℃的温度下进行热分解,并且通过使用至多36个碳原子的芳族或芳脂族单羧酸的至多18个碳原子的脂族单羧酸的锡(II)盐作为催化剂, 脂族或芳族羟基,聚 - ,酮羧酸或至多18个碳原子的二羧酸的原子; 或其中R 1和R 2为1-18个碳原子的烷基或6-36个碳原子的芳基或芳烷基的式(ⅩⅧ)的有机锡化合物和O,O-二烷基 - (3,5- 二叔丁基-4-羟基苄基) - 膦酸酯,其中每个烷基具有2-18个碳原子。