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Published on: June 20, 2019
Aluminum Salen Complexes Modified with Unsaturated Alcohol: Synthesis, Characterization, and Their Activity towards
Kirill V Zaitsev1, Andrey D Trubachev1, Yuri F Oprunenko1
1Department of Chemistry, Moscow State University, Leninskye Gory 1, 3, Moscow 119991, Russia.
Abstract:
A highly efficient one-step approach to the macromonomer synthesis using modified aluminum complexes as catalysts of ring-opening polymerization (ROP) of ε-caprolactone and D,L-lactide was developed. The syntheses, structures, and catalytic activities of a wide range of aluminum salen complexes, 3a-c, functionalized with unsaturated alcohol (HO(CH2)4OCH=CH2) are reported. X-Ray diffraction studies revealed a tetragonal pyramidal structure for 3c. Among the complexes 3a-c, the highest activity in bulk ROP of ε-caprolactone and D,L-lactide was displayed by 3b, affording polyesters with controlled molecular weights at low monomer to initiator ratios (M up to 15,000 g mol-1), relatively high polydispersities (Ð~1.8) and high number-average functionalities (F up to 85%).
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