NDLI: Ring-opening polymerization of ε-caprolactone and cyclohexene oxide initiated by aluminum β-ketoamino complexes: steric and electronic effect of 3-position substituents of the ligands

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Ring-opening polymerization of ε-caprolactone and cyclohexene oxide initiated by aluminum β-ketoamino complexes: steric and electronic effect of 3-position substituents of the ligands

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Ring-opening polymerization of ε-caprolactone and cyclohexene oxide initiated by aluminum β-ketoamino complexes: steric and electronic effect of 3-position substituents of the ligands

Content Provider	Springer Nature Link
Author	Liu, Binyuan Li, Haiqing Ha, Chang Sik Kim, Il Yan, Weidong
Copyright Year	2008
Abstract	A series of aluminum complexes supported by β-ketoamino, ligand-bearing, 3-position substituentsLAlEt$_{2}$ (L=CH$_{3}$C(O)C(Cl)=C(CH$_{3}$)NAr (L $_{1}$), L=CH$_{3}$C(O)C(H)=C(CH$_{3}$)NAr (L $_{2}$), L=CH$_{3}$C(O)C(Ph)=C(CH$_{3}$)NAr (L $_{3}$), and L=CH$_{3}$C(O)C(Me)=C(CH$_{3}$)NAr (L $_{4}$), Ar=2,6-Pr$_{2}$C$_{6}$H$_{3}$) were synthesized in situ and employed in the ringopening polymerization (ROP) of ε-caprolactone (ε-CL) and cyclohexene oxide (CHO). The 3-position substituents on the β-ketoamino ligand backbone of the aluminum complexes influenced the catalyst activity remarkably for both ROP of ε-CL and CHO. Aluminum β-ketoamino complexes displayed different catalytic behavior in ROP of ε-CL and CHO. The order of the catalytic activity ofLAlEt$_{2}$ wasL $_{1}$AlEt$_{2}$>L $_{2}$AlEt$_{2}$>L $_{3}$AlEt$_{2}$>L $_{4}$AlEt$_{2}$ for ROP of ε-CL, being opposite to the electron-donating ability of the 3-position substituents on the β-ketoamino ligand, while the order of the catalytic activity for ROP of CHO wasL $_{1}$AlEt$_{2}$>L $_{3}$AlEt$_{2}$>L $_{4}$AlEt$_{2}$>L $_{2}$AlEt$_{2}$. The effects of reaction temperature and time on the ROP were also investigated for both ε-CL and CHO.
Starting Page	441
Ending Page	445
Page Count	5
File Format	PDF
ISSN	15985032
Journal	Macromolecular Research
Volume Number	16
Issue Number	5
e-ISSN	20927673
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ring-opening polymerization ε-caprolactone cyclohexene oxide aluminum β-ketoamino complexes Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Physical Chemistry Characterization and Evaluation of Materials Nanochemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Chemical Engineering Polymers and Plastics

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