Application of 1436-59-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 1436-59-5, Name is cis-Cyclohexane-1,2-diamine
Rare earth metal complexes based on beta-diketiminato and novel linked bis(beta-diketiminato) ligands: Synthesis, structural characterization and catalytic application in epoxide/CO2-copolymerization
Mesityl substituted beta-diketiminato lanthanum and yttrium complexes [(BDI)Ln{N(SiRMe2)}2] (BDI = ArNC(Me)CHC(Me)NAr, Ar = 2,4,6-Me3C6H2, Ln = La, R = Me (1), H (2a); Ln = Y, R = H (2b)) can be prepared via facile amine elimination starting from [La{N(SiMe3)2}3] and [Ln{N(SiHMe 2)2}3(THF)2] (Ln = Y, La), respectively. The X-ray crystal structure analysis of 1 revealed a distorted tetrahedral geometry around lanthanum with a eta2-bound beta-diketiminato ligand. A series of novel ethylene- and cyclohexyl-linked bis(beta-diketiminato) ligands [C2H4(BDI Ar)2]H2 and [Cy(BDIAr) 2]H2 [Ar = Mes (=2,4,6-Me3C6H 2), DEP (=2,6-Et2C6H3), DIPP (=2,6-i-Pr2C6H3)] were synthesized in a two step condensation procedure. The corresponding bis(beta-diketiminato) yttrium and lanthanum complexes were obtained via amine elimination. The X-ray crystal structure analysis of the ethylene-bridged bis(beta-diketiminato) complex [{C2H4(BDIMes)2}YN(SiMe 3)2] (3b) and cyclohexyl-bridged complexes [{Cy(BDI Mes)2}LaN(SiHMe2)2] (7) and [{Cy(BDIDEP)2}LaN(SiMe3)2] (8) 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 beta-diketiminato moieties form the basis. The geometry of the bis(beta-diketiminato) ligands depends significantly on the linker unit. While complexes with an ethylene-linked ligand adopt a cisoid arrangement of the two aromatic substituents, complexes with cyclohexyl linker adopt a transoid arrangement. Either one (3b) or both (7, 8) of the beta-diketiminato moieties are tilted out of the eta2 coordination mode, resulting in close Ln?C contacts. The beta-diketiminato and linked bis(beta- diketiminato) complexes were moderately active in the copolymerization of cyclohexene oxide with CO2. A maximum of 92% carbonate linkages were obtained using the ethylene-bridged bis(beta-diketiminato) complex [{C 2H4(BDIMes)2}LaN(SiHMe 2)2] (4).
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Chiral Catalysts,
Chiral catalysts – SlideShare