1203350-99-5Relevant articles and documents
Synthesis and structural characterization of aluminum complexes supported by NNO-tridentate ketiminate ligands: Efficient catalysts for ring-opening polymerization of l-lactide
Chuang, Hui-Ju,Su, Yu-Chu,Ko, Bao-Tsan,Lin, Chu-Chieh
, p. 38 - 42 (2012)
Four NNO-tridentate ketiminate derivatives (HL-H, FL-H, OMeL-H and tBuL-H) were prepared through the condensation reaction of 1-(4-chlorophenyl)-4-(4-X-benzoyl)-3-methyl-1H- pyrazol-5(4H)-one (X = H, F, OMe, tBu) with N,N-dimethylenediamine (1.1 molar equiv) under reflux condition. Further reaction of AlMe3 (1.2 molar equiv) with HL-H, FL-H, OMeL-H and tBuL-H, respectively, affords penta-coordinated mono-adduct aluminum complexes [(HL)AlMe2] (1), [(FL)AlMe 2] (2), [(OMeL)AlMe2] (3), and [( tBuL)AlMe2] (4) in high yield. Experimental results indicate complexes 1-4 are active catalysts for ring-opening polymerization of l-lactide (l-LA) in the presence of benzyl alcohol (BnOH). Al complex 2 catalyzes efficiently not only in a "living" fashion but also an "immortal" manner, giving polymers with the expected molecular weights and narrow PDIs.