Aluminium complexes containing pyrazolyl-phenolate ligands as catalysts for ring opening polymerization of epsilon-caprolactone

作者：Huang Tzu Lun; Chen Chi Tien^*

来源：Journal of Organometallic Chemistry, 2013, 725: 15-21.

DOI：10.1016/j.jorganchem.2012.12.003

• Aluminium
• Pyrazolyl-phenolate ligand
• Ring opening polymerization
• epsilon-Caprolactone

A series of pyrazolyl-phenolate ligand precursors has been described. Reactions of five pyrazolyl-phenolate ligand precursors, HOPh(Me)Pz(Me), HOPh(Me)Pzt(Bu), HOPh(Me)Pz(Ph), HOPh(Me)Pz(F-Ph) or HOPh(H)Pz(tBu), with one molar equivalent of AlMe3 in THF gave the aluminium dimethyl complexes, Me2Al(OPh(R1)Pz(R2)) [R1 methyl, R2 methyl, Me2Al(OPh(Me)Pz(Me)) (1); R1 methyl, R2 tert-butyl, Me2Al(OPh(Me)Pz(tBu)) (2); R1 methyl, R2 phenyl, Me2Al(OPh(Me)Pz(Ph)) (3); R1 methyl, R2 4-fluorophenyl, Me2Al(OPh(Me)Pz(F-Ph)) (4); R1 H, R2 tert-butyl, Me2Al(OPh(H)Pz(tBu)) (5)], respectively. The molecular structures are reported for compounds 3 and 5. Their catalytic activities towards the ring opening polymerization reaction of epsilon-caprolactone in the presence of benzyl alcohol are also under investigation.

• 出版日期2013-2-1