471247-65-1Relevant academic research and scientific papers
Synthesis of β-diketiminate derivatives of zinc alkoxides: Catalytic properties for ring opening polymerization
Athar, Taimur,Hakeem, Abdul,Topnani, Neha
, p. 887 - 890 (2011)
A series of zinc (II) complexes has been prepared based on a β-diketiminate ligand framework and exhibits the highest rate of polymerization with better stereoselectivity in the formation of polylactic from the rac-lactide with aggregation and narrow poly
A series of aluminium complexes based on a β-diketiminate ligand: Synthesis, structures and their application to ring-opening polymerization of ε-caprolactone
Pan, Huifen,Li, Yafei,Wang, Yalan,Ge, Yu,Xia, Shengwang,Li, Yahong
, p. 210 - 216 (2019)
A series of aluminum complexes based on a β-diketiminate ligand HL (HL = N{-4-[(2,6-diisopropyl-phenylamino)pent-3-en-2-ylidene]-6-methyl}pyridin-2- amine) have been prepared and characterized spectroscopically and structurally. Reactions of the HL ligand
OXO-NITROGENATED COMPLEX OF LANTHANIDES, CATALYIC SYSTEM COMPRISING SAID OXO-NITROGENATED COMPLEX AND PROCESS FOR THE (CO) POLYMERIZATION OF CONJUGATED DIENES
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Page/Page column 41; 42, (2018/03/24)
An oxo-nitrogenated complex of lanthanides having general formula (I) or (II): Said oxo-nitrogenated complex of lanthanides having general formula (I) or (II) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes
Reduction of sterically hindered β-diketiminato europium(III) complexes by the β-diketiminato anion: A convenient route for the synthesis of β-diketiminato europium(II) complexes
Shen, Xiaodong,Zhang, Yong,Xue, Mingqiang,Shen, Qi
experimental part, p. 3668 - 3674 (2012/05/20)
The metathesis reaction of anhydrous EuCl3 with sodium salt of bulky β-diketiminato NaL (L = [N(2, 4, 6- Me3C6H 2)C(Me)]2CH-, L2, 4, 6-Me3; [N(2,6-iPr2Csub
Linked bis(β-diketiminato) yttrium and lanthanum complexes as catalysts in asymmetric hydroamination/cyclization of aminoalkenes (AHA)
Vitanova, Daniela V.,Hampel, Frank,Hultzsch, Kai C.
experimental part, p. 321 - 330 (2011/02/17)
Linked bis(β-diketiminato) rare-earth metal complexes based on the ethylene-bridged ligand [C2H4(BDIDClP) 2]H2 [DClP = 2,6-Cl2C6H3] and the cyclohexyl-bridged ligands [Cy(BDIAr)2]H 2 [Ar = PMP (= p-MeOC6H4), Mes (= 2,4,6-Me 3C6H2), DIPP (= 2,6-iPr2C 6H3)] were prepared via amine elimination starting from [Ln{N(SiMe3)2}3] (Ln = La, Y). The three cyclohexyl-bridged complexes [{(R,R)-Cy(BDIMes)2} YN(SiMe3)2] ((R,R)-3), [{(R,R)-Cy(BDIMes) 2}LaN(SiMe3)2] ((R,R)-4), and [{(R,R)-Cy(BDIDIPP)2}LaN(SiMe3)2] ((R,R)-5) were obtained enantiomerically pure. The X-ray crystal structure analysis of the racemic variants of 3 and 4 revealed a distorted square pyramidal coordination geometry around the rare-earth metal, in which the amido ligand occupies the apical position and the two linked β-diketiminato moieties form the basis. The two aromatic substituents adopt a transoid arrangement and both β-diketiminato moieties are bound in a η5 coordination mode with close Ln?C contacts. Due to the smaller ionic radius of yttrium vs. lanthanum, the front side of the yttrium complex 3 is sterically more hindered than in the lanthanum complex 4, but there is much more empty coordination space on the rear side, which may rationalize the observed differences in selectivity of 3 in comparison to 4. The catalytic efficiency of the β-diketiminato complexes was strongly affected by steric factors such as ionic radius of the metal and the steric bulk of the aryl substituents, which is an indication for highly steric encumbered catalytic species. The complexes displayed good to moderate catalytic activity in the hydroamination/cyclization of aminoalkenes depending on the steric hindrance around the metal center. The sterically most demanding diisopropylphenyl- substituted complex (R,R)-5 displayed significantly higher enantioselectivities (up to 76% ee), but lower catalytic activity in comparison to the sterically more open mesityl-substituted complex (R,R)-4. The smaller yttrium metal center in complex (R,R)-3 led to reduced activity as well as a reversal in enantioselectivity, which may be rationalized by a change of the approach of the alkene moiety to the Ln-amido bond in the cyclization transition state.
