Journal ArticleDOI
Mixed-ligand guanidinate derivatives of rare-earth metals. Molecular structures of { (Me3Si)2NC(N-cyclo-Hex)2}Y[N(SiMe3)2]2, [{ (Me3Si)2NC(N-cyclo-Hex)2}YbI(THF)2]2, and [{(Me3Si)2N} Y(THF)(µ-Cl)]2 complexes
A. A. Trifonov,Dmitry M. Lyubov,E. A. Fedorova,Grigorii G. Skvortsov,Georgii K. Fukin,Yu. A. Kurskii,Mikhail N. Bochkarev +6 more
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TLDR
In this paper, the insertion of N,N′-dicyclohexyl carbodiimide at one of the Y-N bonds of the [(Me3Si)2N]3Y complex in toluene at 70 °C afforded the monoguanidinate diamide derivative { (Me 3Si2NC(N-cyclo-Hex)2}Y[N(SiMe)3]2 ) in 72% yield.Abstract:
The insertion of N,N′-dicyclohexylcarbodiimide at one of the Y-N bonds of the [(Me3Si)2N]3Y complex in toluene at 70 °C afforded the monoguanidinate diamide derivative { (Me3Si)2NC(N-cyclo-Hex)2}Y[N(SiMe)3]2 (1) (cyclo-Hex is cyclohexyl) in 72% yield. The reaction of equimolar amounts of sodium N,N′-dicyclohexyl-N″-bis(trimethylsilyl)guanidinate, which was prepared in situ from {(Me3Si)2N}Na and N,N′-dicyclohexylcarbodiimide, and YbI2(THF)2 in THF gave the [{(Me3Si)2NC(N-cyclo-Hex)2}YbI(THF)2]2 complex (2). An attempt to use this procedure for the synthesis of the yttrium compound { (Me3Si)2NC(NSiMe3)2}2YCl containing the sterically more hindered guanidinate ligand unexpectedly led to the formation of the diamide chloride complex [{(Me3Si)2N}2Y(THF)(µ-Cl)]2 (3). The structures of complexes 1–3 were established by X-ray diffraction. Compound 1 is mononuclear. Complexes 2 and 3 are dinuclear and contain two µ2-bridging halide ligands.read more
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Book ChapterDOI
Chapter 3 – Advances in the Coordination Chemistry of Amidinate and Guanidinate Ligands ☆
Journal ArticleDOI
Influence of Schiff base and lanthanide metals on the synthesis, stability, and reactivity of monoamido lanthanide complexes bearing two Schiff bases.
TL;DR: The monoamido lanthanide complexes stabilized by Schiff base ligand L(2)LnN(TMS)(2) (Ln = Yb (9), Y (10), Nd (11), and La (12), and the more stable tris-Schiff base complexes with the large metals of La and Nd, yielded L''(3) Ln as the only product.
Journal ArticleDOI
Activation of carbodiimide and transformation with amine to guanidinate group by Ln(OAr)3(THF)2 (Ln: lanthanide and yttrium) and Ln(OAr)3(THF)2 as a novel precatalyst for addition of amines to carbodiimides: influence of aryloxide group.
TL;DR: Complexes Ln(OAr(1))(3)(THF)(2) were found to be the novel precatalysts for addition of RNCNR with amines, which represents the first example of catalytic guanylation by the lanthanide complexes with the Ln-O active group.
Journal ArticleDOI
Rare-Earth Amidate Complexes. Easily Accessed Initiators For ε-Caprolactone Ring-Opening Polymerization
TL;DR: Solution phase NMR spectroscopic characterization of the tris(N-2',6'-diisopropylphenyl(naphthyl)amidate)yttrium mono(tetrahydrofuran) complex showed a highly symmetric species, consistent with a fluxional coordination environment for these compounds.
Journal ArticleDOI
Lanthanide amido complexes incorporating amino-coordinate-lithium bridged bis(indolyl) ligands: synthesis, characterization, and catalysis for hydrophosphonylation of aldehydes and aldimines.
Xiancui Zhu,Shaowu Wang,Shaowu Wang,Shuangliu Zhou,Yun Wei,Lijun Zhang,Fenhua Wang,Zhijun Feng,Liping Guo,Xiaolong Mu +9 more
TL;DR: Two series of new lanthanide amido complexes supported by bis(indolyl) ligands with amino-coordinate-lithium as a bridge could be reciprocally transformed easily by merely changing the solvent in the reactions.
References
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Journal ArticleDOI
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TL;DR: The catalytic production of organic molecules is one of the most important applications of organometallic chemistry and enantioselective syntheses of molecules bearing an amine functionality use classical stoichiometric reactions with chiral auxiliaries or utilize enantiomerically pure starting material.
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Synthesis, Structure, and Reactivity of Organometallic .pi.-Complexes of the Rare Earths in the Oxidation State Ln3+ with Aromatic Ligands
Journal ArticleDOI
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Journal ArticleDOI
The coordination chemistry of guanidines and guanidinates
Philip J. Bailey,Stuart Pace +1 more
TL;DR: Guanidines have attracted increasing attention as electronically and sterically flexible ligands as mentioned in this paper, exhibiting a variety of coordination modes and a range of donor properties leading to compatibility with a remarkably wide range of metal ions from all parts of the periodic table.