6099-39-4Relevant academic research and scientific papers
Well-controlled ring-opening polymerization of cyclic esters initiated by dialkylaluminum β-diketiminates
Li, Di,Peng, Ying,Geng, Chao,Liu, Kaipeng,Kong, Dexu
, p. 11295 - 11303 (2013)
A series of aluminum alkyl complexes nacnacRAlMe2 (2a-2h) bearing aliphatic N-substituted β-diketiminate ligands (nacnac RH = N,N′-dialkyl-2-amino-4-iminopent-2-enes), were prepared from the reaction of trialkyl aluminum and the corresponding β-diketimines. All these aluminum complexes were characterized by NMR, elemental analysis and HRMS spectroscopy. The molecular structures of complexes 2a, 2c and 2h were confirmed by single-crystal X-ray diffraction. These aluminum alkyl complexes show notable activity towards the ring-opening polymerization of ε-caprolactone in the absence and presence of alcohol, and the resulting polymers have narrow molecular weight distributions.
Zirconium complexes of symmetric and of chiral diketiminate ligands: Synthesis, crystal structures, and reactivities
El-Zoghbi, Ibrahim,Latreche, Saida,Schaper, Frank
scheme or table, p. 1551 - 1559 (2010/06/20)
Reaction of N,N-dialkyl-2-amino-4-iminopent-2-enes (nacnacRH; R = Bn (1a), Cy (1b), R-CH(Me)Ph (1c)) with nBuLi afforded the lithium salts nacnacRLi(THF), 2a-c. Further reaction with ZrCl4 or ZrCl4(THF)2 yielded the cis-dichloride complexes nacnacR2ZrCl2, 3a-c. As a side reaction in the synthesis of 3c, CH activation of CH(Me)Ph under formal HCl elimination was observed. Complex 3a could also be obtained by reaction of nacnacBnH with nBu2ZrCl2. nacnacBn2ZrMe 2, 5, was formed in reactions of 3a with MeLi in the presence of excess AlMe3 and was isolated from the reaction of Me 2ZrCl2 with 2a. Complex 5 reacts with aluminum chloride compounds, but not with lithium chloride, to form the dichloride complex 3a and with ethanol to form nacnacBn2Zr(OEt)2, 6. X-ray diffraction studies have been performed for 3a-c, 5, and 6.
