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首页> 外文期刊>Organometallics >Synthesis of aluminum complexes of triaza framework ligands and their catalytic activity toward polymerization of ε-caprolactone
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Synthesis of aluminum complexes of triaza framework ligands and their catalytic activity toward polymerization of ε-caprolactone

机译：三氮杂骨架配体的铝配合物的合成及其对ε-己内酯聚合的催化活性

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摘要

The synthesis and characterization of 1,5-bis(2,6-diisopropylphenyl)-2,4- diphenyl-1,3,5-triazapenta-1,3-diene (L1~H), a triaza ligand, and Al complexes of its anion are reported. A neat condensation reaction between N-(Dipp)benzamidine (Dipp = 2,6-diisopropylphenyl) and N-(Dipp)benzimidoyl chloride affords L1~H in good yield. The Al complexes [L 1~AlMe_2] (1), [L1~AlMe(Cl)] (2), and [L 1~AlCl_2] (3) are prepared by treating L1~H with a slight excess of AlMe_3, AlMe_2Cl, and AlMeCl_2, respectively, in toluene. Further, the aluminum complexes [L 2~AlMe_2] (5), [L2~AlMe(Cl)] (6), and [L 2~AlCl_2] (7) are obtained in good yields from 1,3-bis(2-pyridylimino)isoindoline (L2~H) in a similar fashion. The ligand L1~H and complexes 1, 2, and 4-6 have been structurally characterized. All of the complexes have been explored for their catalytic activity toward the ring-opening polymerization (ROP) of ε-caprolactone. It has been found that [L1~AlMe_2], upon the addition of cocatalyst (benzyl alcohol), gives a tetranuclear Al alkoxide (8), which is highly efficient in catalyzing the ROP of ε-caprolactone. [L 2~AlMe_2] has also been found to be a good catalyst. The crystal structure of 8 and the catalytic activities of all the complexes in detail are reported.
机译：1,5-双（2,6-二异丙基苯基）-2,4-二苯基-1,3,5-三氮杂双-1,3-二烯（L1〜H），三氮杂配体和Al配合物的合成与表征报告了其阴离子。 N-（Dipp）苯甲m（Dipp = 2,6-二异丙基苯基）与N-（Dipp）苯甲酰氯之间的纯净缩合反应可得到高产的L〜H。通过用稍微过量的AlMe_3，AlMe_2Cl处理L1〜H来制备Al络合物[L 1〜AlMe_2]（1），[L1〜AlMe（Cl）]（2）和[L 1〜AlCl_2]（3）。 ，和AlMeCl_2，分别在甲苯中。此外，从1，3-双（2）以良好的产率获得铝络合物[L 2 -AlMe_2]（5），[L2-AlMe（Cl）]（6）和[L 2-AlCl_2]（7）。 -pyridylimino）isododoline（L2〜H）以类似的方式。配体L1-H和配合物1、2和4-6已经在结构上进行了表征。已经探索了所有配合物对ε-己内酯的开环聚合（ROP）的催化活性。已经发现，[L1-AlMe_2]在加入助催化剂（苄醇）后，得到四核铝醇盐（8），其在催化ε-己内酯的ROP方面非常有效。还发现[L 2〜AlMe_2]是良好的催化剂。详细报道了8的晶体结构和所有配合物的催化活性。

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