Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 52-89-1, Name is H-Cys-OH.HCl, molecular formula is C3H8ClNO2S. In an article, author is Saad, Eman M.,once mentioned of 52-89-1, SDS of cas: 52-89-1.
Rare-earth metal derivatives supported by aminophenoxy ligand: Synthesis, characterization and catalytic performance in lactide polymerization
A library of rare-earth metal derivatives supported by an aminophenoxy ligand was prepared and their catalytic performance in lactide polymerization was investigated. It was found that the synthetic strategy had a profound effect on the formation of aminophenoxy rare-earth metal complexes. Amine elimination between Ln[N(SiMe3)(2)](3)(mu-Cl)Li(THF)(3) (Ln = Yb, Y) and 1 equiv. of the aminophenol [HONH] ([HONH] = omicron-OCH3-C6H4NHCH2(3,5-Bu-t(2)-C6H2-2-OH)) in toluene gave the unexpected heterobimetallic bis(aminophenoxy) rare-earth metal complexes [ON](2)LnLi(THF)(2) (Ln = Yb (1), Y (2)). When the reactions were carried out in THF and TMEDA, amine elimination produced the aminophenoxy rare-earth metal amide complexes {[ON]LnN(SiMe3)(2)}(2) (Ln = Yb (5), Y (6)) in ca 85% isolated yields. Complexes 5 and 6 could also be obtained from salt metathesis reaction of {[ON]LnCl(THF)}(2) (Ln = Yb (3), Y (4)) with NaN(SiMe3)(2) in a 1:2 molar ratio. In addition, treatment of complexes 3 and 4 with NaOAr (Ar = bond C6H4-4-Bu-t) and (SiMe3)(2)NC(NPri)(2)Na in 1:4 and 1:2 molar ratios provided the corresponding aminophenoxy rare-earth metal derivatives {[ON](mu-OAr)Ln(mu-OAr)Na(THF)(2)}(2) (Ln = Yb (7), Y (8)) and {[ON]Ln[((PrN)-Pr-i)(2)CN(SiMe3)(2)]}(2) (Ln = Yb (9), Y (10)), respectively. These complexes were fully characterized, and their molecular structures were determined using single-crystal X-ray diffraction. Polymerization experiments showed that complexes 1, 2, 5, 6, 9 and 10 were highly active for the ring-opening polymerization of l-lactide in toluene, and complex 1 promoted l-lactide polymerization in a controlled fashion. The polymerization of rac-lactide initiated by the neutral aminophenoxy rare-earth metal complexes 5, 6, 9 and 10 in THF afforded heterotactic polymers.
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