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Zirconium vs Aluminum Salalen Initiators for the Production of Biopolymers

机译:锆与铝Salalen引发剂用于生产生物聚合物

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Herein we report the synthesis and full characterization (NMR and solid-state structures) for a series of Zr(IV), Hf(IV), and Al(III) salalen complexes, together with salen bimetallic counterparts. With the salalen ligand, 1H(2), monometallic complexes were observed in solution and solid state. Complex Zr(1)((OPr)-Pr-i)(2) was able to produce isotactic polylactide (PLA) from rac-lactide (P-m up to 0.85) in solution at 50 degrees C; in the melt (130 degrees C) this reduced to ca. 0.75. Al(1)Me was significantly less active and produced PLA with only a very modest isotactic enchainment (P-m approximate to 0.6). Zr(1)((OPr)-Pr-i)(2) was also able to produce copolymers with lactide and e-caprolactone, producing copolymers of a "blocky" nature.
机译:本文中,我们报告了一系列Zr(IV),Hf(IV)和Al(III)Salalen配合物以及Salen双金属对应物的合成和完整表征(NMR和固态结构)。与salalen配体1H(2),在溶液和固态中观察到单金属配合物。络合物Zr(1)((OPr)-Pr-i)(2)能够在50摄氏度下由外消旋丙交酯(P-m高达0.85)生成等规聚乳酸(PLA);在熔体中(130摄氏度),该温度降低至0.75。 Al(1)Me的活性显着降低,并且仅具有非常适度的全同规链(P-m约为0.6)产生了PLA。 Zr(1)((OPr)-Pr-1)(2)也能够生产具有丙交酯和ε-己内酯的共聚物,从而生产出具有“嵌段”性质的共聚物。

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