Synthesis, structure, and catalytic activity of new aluminum and titanium complexes based on aminobisphenolate ligands containing bulky substituents


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A reaction of aminobisphenols EtN{CH2[(4-Alk)(6-But)(2-HO)C6H2]}2, Alk = Me (1); But (2) containing alkyl substituents in the phenol groups with trimethylaluminum and tetra(tert-butoxy)titanium gave two new aluminum derivatives with the Me–Al bond: EtN{CH2[(2-Alk)-(4-But)C6H2(2-O–)]}2Al–Me, Alk = Me (3); But (4), and two new titanium derivatives with the ButO–Ti bond: EtN{CH2[(2-Alk)(4-But)C6H2(2-O–)]}2Ti(O–But)2, Alk = Me (5); But (6). The structures of new compounds were confirmed by NMR spectroscopy and elemental analysis. The structures of complexes 3 and 6 were studied by X-ray crystallography. Complexes 3 and 6 are monomeric in the solid phase: a coordination number of Al atom is 4, that of Ti atom is 5, in addition to the M–O bonds the M←N interactions are also present. Complexes 3–6 were studied as initiators of the ring-opening polymerization of ε-caprolactone. The resulting polymers are characterized by relatively high values of number average molecular weight, with the polydispersity being relatively low.

作者简介

E. Kuchuk

Department of Chemistry, M. V. Lomonosov Moscow State University

Email: sergej@org.chem.msu.ru
俄罗斯联邦, Build. 3, 1 Leninskie Gory, Moscow, 119991

K. Zaitsev

Department of Chemistry, M. V. Lomonosov Moscow State University

编辑信件的主要联系方式.
Email: sergej@org.chem.msu.ru
俄罗斯联邦, Build. 3, 1 Leninskie Gory, Moscow, 119991

F. Mamedova

Baku Branch, M. V. Lomonosov Moscow State University

Email: sergej@org.chem.msu.ru
阿塞拜疆, 1 ul. Universitetskaya, Baku, pos. Khodzhasan, AZ1144

A. Churakov

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: sergej@org.chem.msu.ru
俄罗斯联邦, 31 Leninsky prosp., Moscow, 119991

G. Zaitseva

Department of Chemistry, M. V. Lomonosov Moscow State University

Email: sergej@org.chem.msu.ru
俄罗斯联邦, Build. 3, 1 Leninskie Gory, Moscow, 119991

D. Lemenovsky

Department of Chemistry, M. V. Lomonosov Moscow State University

Email: sergej@org.chem.msu.ru
俄罗斯联邦, Build. 3, 1 Leninskie Gory, Moscow, 119991

S. Karlov

Department of Chemistry, M. V. Lomonosov Moscow State University

Email: sergej@org.chem.msu.ru
俄罗斯联邦, Build. 3, 1 Leninskie Gory, Moscow, 119991

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