1624293-17-9Relevant academic research and scientific papers
Controlled ring-opening homo- and copolymerization of ε-caprolactone and D,L -lactide by iminophenolate aluminum complexes: An efficient approach toward well-defined macromonomers
Zaitsev, Kirill V.,Piskun, Yulia A.,Oprunenko, Yuri F.,Karlov, Sergey S.,Zaitseva, Galina S.,Vasilenko, Irina V.,Churakov, Andrei V.,Kostjuk, Sergei V.
, p. 1237 - 1250 (2014/04/17)
The aluminum complexes containing two iminophenolate ligands of the type (p-XC6H4NCHC6H4O-o)2AlR' (R=Me (3, 4) or R=O(CH2)4OCH=CH2 (5, 6), X=H (3, 5), F(4, 6)) were synthesized and characterized by 1H, 13C NMR spectroscopy, and X-ray crystallography. The reaction of AlMe3 with two equivalents of substituted iminophenols gave five-coordinated {ONR}2AlMe (3, 4) complexes. Subsequent reaction of these methyl complexes with unsaturated alcohol, HO(CH2) 4OCH=CH2, resulted in target compounds 5 and 6 in a good yield. It was shown that the complexes (3-6) are monomeric in solution (NMR) and in solid state (X-ray analysis). The catalytic activity of the complexes 5 and 6 towards ring-opening polymerization (ROP) of ε-caprolactone and d,l-lactide was assessed. Complex 5 showed higher activity as compared with 6, while both of these catalysts induced controlled homo- and copolymerization to afford the macromonomers with high content of vinyl ether end groups (F n > 80%) in a broad range of molecular weights (Mn = 4000-30,000 g mol-1) with relatively narrow MWD (Mw/M n = 1.1-1.5).
