title: N-Benzoylbenzamidinate complexes of aluminium: highly efficient initiators for the ring-opening polymerization of ε-caprolactone.
abstract: A series of aluminium complexes supported by amidinate-based N,O-chelate ligands are synthesized and characterized. While complexes [L(Dipp)AlMe2] () and [L(Ph)AlMe2] () are prepared by treating N-benzoyl-N'-2,6-diisopropylphenylbenzamidine (L(Dipp)H) and N-benzoyl-N'-phenylbenzamidine (L(Ph)H) with a slight excess of 1 equiv. of AlMe3, complexes [(L(Dipp))2AlMe] () and [(L(Ph))3Al] () can be obtained using the ligands and AlMe3 in 2 : 1 and 3 : 1 molar ratios respectively. Complexes have been characterized by (1)H/(13)C NMR spectroscopy and elemental analysis. The molecular structures of complexes , and have also been determined by single crystal X-ray diffraction technique. , and are highly active initiators for the ring opening polymerization (ROP) of ε-caprolactone and produce polycaprolactone with very high molecular weight and narrow molecular weight distribution. These complexes are also active toward the ROP of cyclohexene oxide.
authors.affiliation: Department of Chemistry, Pondichacerry University, Pondicherry 605014, India. ndreddy.che@pondiuni.edu.in.
authors.forename: K
authors.initials: K
authors.lastname: Bakthavachalam
authors.forename: Ashwene
authors.initials: A
authors.lastname: Rajagopal
authors.forename: N
authors.initials: N
authors.lastname: Dastagiri Reddy
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D000578:Amidines / Q000737:chemistry*; D002208:Caproates / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007783:Lactones / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D058105:Polymerization
chemical_list: D000578:Amidines; D002208:Caproates; D056831:Coordination Complexes; D007783:Lactones; C121056:caprolactone; D000535:Aluminum