Jump to main content
Jump to site search

Issue 22, 2018
Previous Article Next Article

Versatile organoaluminium catalysts based on heteroscorpionate ligands for the preparation of polyesters

Author affiliations

Abstract

A series of alkyl aluminium complexes based on heteroscorpionate ligands were designed as catalysts for the ring-opening polymerisation of cyclic esters and ring-opening copolymerisation of epoxides and anhydrides. Treatment of AlX3 (X = Me, Et) with ligands bpzbeH [bpzbe = 1,1-bis(3,5-dimethylpyrazol-1-yl)-3,3-dimethyl-2-butoxide], bpzteH [bpzte = 2,2-bis(3,5-dimethylpyrazol-1-yl)-1-para-tolylethoxide], and (R,R)-bpzmmH [(R,R)-bpzmm = (1R)-1-{(1R)-6,6-dimethyl-bicyclo[3.1.1]-2-hepten-2-yl}-2,2-bis(3,5-dimethylpyrazol-1-yl)ethoxide] for 2 hours at 0 °C afforded the mononuclear dialkyl aluminium complexes [AlMe22-bpzbe}] (1), [AlEt22-bpzbe}] (2), [AlMe22-(R,R)-bpzmm}] (3) and [AlEt22-(R,R)-bpzmm}] (4), and the dinuclear dialkyl complexes [AlMe22-bpzte}]2 (5) and [AlEt22-bpzte}]2 (6). The molecular structures of the new complexes were determined by spectroscopic methods and confirmed by X-ray crystallography. The alkyl-containing aluminium complexes can act as highly efficient single-component initiators for the ring-opening polymerisation of ε-caprolactone and L-lactide and for the ring-opening copolymerisation of cyclohexene oxide and phthalic anhydride to give a range of biodegradable polyesters.

Graphical abstract: Versatile organoaluminium catalysts based on heteroscorpionate ligands for the preparation of polyesters

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Apr 2018, accepted on 12 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8DT01553H
Citation: Dalton Trans., 2018,47, 7471-7479
  •   Request permissions

    Versatile organoaluminium catalysts based on heteroscorpionate ligands for the preparation of polyesters

    J. Martínez, M. Martínez de Sarasa Buchaca, F. de la Cruz-Martínez, C. Alonso-Moreno, L. F. Sánchez-Barba, J. Fernandez-Baeza, A. M. Rodríguez, A. Rodríguez-Diéguez, J. A. Castro-Osma, A. Otero and A. Lara-Sánchez, Dalton Trans., 2018, 47, 7471
    DOI: 10.1039/C8DT01553H

Search articles by author

Spotlight

Advertisements