337975-58-3Relevant academic research and scientific papers
Calcium complexes containing oxalamidinate ligands as catalysts for ε-caprolactone polymerization
Huang, Tzu-Lun,Chen, Chi-Tien
, p. 9255 - 9262 (2013/07/27)
A series of calcium complexes containing oxalamidinate ligands is described. Reactions of oxalamidinate ligand precursors, [PhNC{NH(CH 2)2OMe}-C{NH(CH2)2OMe}NPh] (1), [PhNC{NH(CH2)2NMe2}-C{NH(CH2) 2NMe2}NPh] (2), [PhTriMeNC{NH(CH 2)2OMe}-C{NH(CH2)2OMe}NPh TriMe] (3), [PhTriMeNC{NH(CH2) 2SMe}-C{NH(CH2)2SMe}NPhTriMe] (4), [PhTriMeNC{NHCH2Py}-C{NHCH2Py}NPh TriMe] (5), with two molar equivalents of Ca[N(SiMe3) 2]2(THF)2 gave calcium oxalamidinate complexes, [Ca{N(SiMe3)2}(THF)(PhN)C{N(CH2) 2OMe}-]2 (6), [Ca{N(SiMe3)2}(THF) (PhN)C{N(CH2)2NMe2}-]2 (7), [Ca{N(SiMe3)2}(THF)(PhTriMeN)C{N(CH 2)2OMe}-]2 (8), [Ca{N(SiMe3) 2}(THF)(PhTriMeN)C{N(CH2)2SMe}-] 2 (9), [Ca{N(SiMe3)2}(THF)(Ph TriMeN)C{NCH2Py}-]2 (10), respectively. The molecular structure of complex 7 was further characterized by the single crystal X-ray diffraction technique. The catalytic activities of complexes 6-10 toward the ring opening polymerization of ε-caprolactone were studied. Complex 8 exhibited excellent activity for the polymerization of ε-caprolactone with controlled molecular weights and polydispersities.
Synthesis and properties of dimetallic complexes based on a new oxalamidine-derived ligand system with pendant pyridine functionality
Wuckelt, Joerg,Doering, Manfred,Goerls, Helmar,Langer, Peter
, p. 805 - 811 (2007/10/03)
Reaction of sterically hindered bis(imidoyl)chlorides of oxalic acid with picolylamine afforded conformationally locked oxalic acid-derived amidines with pendant pyridine functionalities. Based on this new multivalent ligand system, dimetallic complexes were efficiently prepared.
