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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Lithium, sodium, potassium and calcium amine-bis(phenolate) complexes in the ring-opening polymerization of rac-lactide
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Lithium, sodium, potassium and calcium amine-bis(phenolate) complexes in the ring-opening polymerization of rac-lactide

机译：Rac-Lactide的开环聚合中锂，钠，钾和钙胺 - 双（酚酸钙）复合物

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摘要

Compounds of Li, Na, K and Ca of a tetradentate amino-bis(phenolato) ligand were prepared. Bimetallic compounds formulated as M-2[L](THF)(n) (where M = Na, n = 1 (1 center dot THF) or Li, n = 1 (2 center dot THF)) were synthesized via the reaction of H-2[L] (where [L] = 2-pyridylmethylamino-N,N-bis(2-methylene-4-methoxy-6-tert-butylphenolato) with sodium hydride or n-butyllithium, respectively, in THF. Monometallic complexes MH[L](THF)(n) (where M = Na, n = 1 (3 center dot THF), Li, n = 0 (4) and K, n = 0 (5)) were obtained by reaction of H-2[L] with MN(SiMe3)(2) where M = Na, Li, or K. Calcium complex Ca[L](THF) (6 center dot THF) was synthesized in two ways; reaction of Na-2[L] with calcium iodide in THF, and reaction of Ca[N(SiMe3)(2)](2) with H-2[L] in toluene. Compounds 1-6 exhibit activity for rac-lactide polymerization under melt and solution conditions. Moderate control of polymer molecular weights was achieved in toluene, whereas polydisperse polymer was obtained under solvent free conditions. MALDI-TOF MS analysis of the polymer end groups revealed a predominantly cyclic nature for the polylactides.
机译：制备四环氨基 - 双（苯酚）配体的Li，Na，K和Ca的化合物。通过反应合成为M-2 [L]（THF）（N）（其中M = Na，N = 1（1个中心点THF）或Li，n = 1（2中心点THF））的双金属化合物H-2 [L]（其中[L] = 2-吡啶基甲基氨基-N，N-双（2-亚甲基-4-甲氧基-6-叔丁基丁基苯基），分别在THF中分别用氢化钠或正丁基锂。单金属通过反应获得复合物MH [L]（THF）（N）（其中M = Na，N = 1（3中心点THF），Li，N = 0（4）和K，n = 0（5）） H-2 [L]用Mn（SIME3）（2），其中M = Na，Li或K.用两种方式合成钙络合物Ca [1]（THF）（6中心点THF）; Na-2的反应[L]在THF中的碘化钙，以及Ca [n（SIME3）]（2）与甲苯中H-2 [L]的反应。化合物1-6在熔体和溶液下表现出Rac丙交酯聚合的活性条件。在甲苯中实现了对聚合物分子量的适度控制，而在无溶剂条件下获得多分散聚合物。聚合物端组的MARDI-TOF MS分析显示聚丙乙酯的循环性质。

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