Al(III)-homopiperazine complexes and their exploitation for the production of polyesters

In this paper we report the synthesis and characterisation of a series of Al(III)-homopiperazine complexes. The ortho substituent has been varied from H, Me, tBu to investigate the effect this has on the solid-state structures and on the catalytic activity. Aluminium-methyl complexes involving ligan...

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Bibliographic Details
Published inNew journal of chemistry Vol. 36; no. 9; pp. 1891 - 1896
Main Authors Hancock, Stuart L., Jones, Matthew D., Langridge, Conrad J., Mahon, Mary F.
Format Journal Article
LanguageEnglish
Published CAMBRIDGE Royal Soc Chemistry 01.01.2012
Subjects
Chemistry
Chemistry, Multidisciplinary
Physical Sciences
Science & Technology
CYCLIC ESTERS
CATIONIC ZINC-COMPLEXES
EPSILON-CAPROLACTONE
LIGANDS SYNTHESIS
GROUP-4 SALALEN COMPLEXES
STRUCTURAL-CHARACTERIZATION
RING-OPENING POLYMERIZATION
RAC-LACTIDE
ALKYL COMPLEXES
METAL-COMPLEXES
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Summary:In this paper we report the synthesis and characterisation of a series of Al(III)-homopiperazine complexes. The ortho substituent has been varied from H, Me, tBu to investigate the effect this has on the solid-state structures and on the catalytic activity. Aluminium-methyl complexes involving ligands 1H(2), 3H(2) and 5H(2) have been characterised in the solid-state and the aluminium centres are in pseudo trigonal bipyramidal geometries. The aluminium-methyl complexes were further reacted with benzyl alcohol to generate alkoxide complexes, which have been fully characterised by multinuclear NMR spectroscopy and elemental analysis. The alkoxide complexes were tested in the ring opening polymerisation of rac-lactide, delta-valerolactone and epsilon-caprolactone. Furthermore, triblock polyesters were also prepared with these initiators.
ISSN:1144-0546
1369-9261
DOI:10.1039/c2nj40300e