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Updated: Jun 21, 2026

Preparation of N-(2-alkoxyvinyl)sulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Synthesis and structure of aluminium amine-phenolate complexes
Andrew L Johnson1, Matthew G Davidson, Yolanda Pérez
1Department of Chemistry, University of Bath, Bath, UK BA2 7AY. a.l.johnson@bath.ac.uk
The aluminum complexes [HOiPr.Al(L1)] and [Al(L2)]2 were synthesized and structurally characterized. Only [HOiPr.Al(L1)] demonstrated activity in the ring-opening polymerization of rac-lactide, producing narrow molecular weight polymer.
Area of Science:
- Coordination Chemistry
- Polymerization Catalysis
Background:
- Aluminum complexes with phenol-amine ligands are of interest for catalysis.
- Understanding the structural and catalytic properties of these complexes is crucial.
Purpose of the Study:
- To synthesize and characterize novel aluminum complexes with tris-phenol amine (L1H3), bis-phenol amine (L2H3), and tetra-phenol diamine (L3H4) ligands.
- To evaluate the catalytic activity of selected aluminum complexes in the ring-opening polymerization (ROP) of rac-lactide.
Main Methods:
- Synthesis of aluminum complexes via reaction of aluminum isopropoxide or trimethylaluminum with various phenol-amine ligands.
- Structural characterization using single crystal X-ray diffraction.
- Catalytic testing in ring-opening polymerization of rac-lactide under solvent-free conditions.
Main Results:
- Formation and structural characterization of isopropanol and THF adducts with L1H3 ligand: [HOiPr.Al(L1)] and [THF.Al(L1)].
- Isolation and structural characterization of dimeric [Al(L2)]2 and monomeric [Al(L3)H] complexes.
- The complex [HOiPr.Al(L1)] effectively catalyzed the ROP of rac-lactide, yielding narrow molecular weight polymer with high yields and low polydispersity.
- [Al(L2)]2 showed no activity in the ROP of rac-lactide under the tested conditions.
Conclusions:
- The synthesized aluminum complexes exhibit diverse structures depending on the ligand and reaction conditions.
- [HOiPr.Al(L1)] is an active catalyst for the ring-opening polymerization of rac-lactide, highlighting the influence of ligand structure on catalytic performance.
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