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Asymmetric Cyanation with the Chiral Ru-Li Combined Catalysts
Full text linkThe combined systems of phenylglycinate/BINAP/Ru(II) complex and Li compounds have been found to act as highly reactive and enantioselective catalysts for cyanosilylation and hydrocyanation of aldehydes, α-keto esters, α,β-unsaturated ketones, and N-protected aldimines. In this account, we describe the concept of catalyst design, the catalytic efficiency of the novel combined systems in the asymmetric cyanation, and the proposed reaction pathway based on the spectral analysis data. 1 Introduction. 2 Cyanosilylation of Aldehydes and Ketones Catalyzed by LiCl. 3 Asymmetric Cyanosilylation of Aldehydes and α-Keto Esters. 3.1 Design of Chiral Ru-Li Combined Catalyst Systems. 3.2 Cyanosilylation of Aldehydes. 3.3 Cyanosilylation of α-Keto Esters. 4 Asymmetric Hydrocyanation of Aldehydes, α,β-Unsaturated Ketones, and Aldimines. 4.1 Hydrocyanation of Aldehydes. 4.2 Conjugate Cyanation of α,β-Unsaturated Ketones. 4.3 Strecker-Type Reaction. 5 Mechanistic Considerations for Cyanosilylation of Aldehydes and Ketones. 5.1 Achiral Reaction Catalyzed by LiCl. 5.2 Asymmetric Reaction with the Chiral Ru-Li Combined Catalyst. 6 Conclusion
The degeneration of image singularities from anisotropic materials to isotropic materials for an elastic half-plane
No full textImage singularities of Green’s functions for isotropic elastic bimaterials subjected to concentrated forces and dislocations
No full textFull Field Analysis of Planar Anisotropic Layered Half-Plane for Concentrated Forces and Edge Dislocations
No full text
Image Singularities of Green's Functions for an Isotropic Elastic Half-Plane Subjected to Forces and Dislocations
No full textAntiplane Deformations for Anisotropic Multilayered Media by Using the Coordinate Transform Method
No full textFull-field analysis of a planar anisotropic layered half-plane for concentrated forces and edge dislocations
No full textTheoretical Full-Field Analysis of Dissimilar Isotropic Composite Annular Wedges under Anti-Plane Deformations
No full text“Job-Sharing” Storage of Hydrogen in Ru/Li<sub>2</sub>O Nanocomposites
No full textA “job-sharing”
hydrogen storage mechanism is proposed and experimentally investigated
in Ru/Li<sub>2</sub>O nanocomposites in which H<sup>+</sup> is accommodated
on the Li<sub>2</sub>O side, while H<sup>–</sup> or e<sup>–</sup> is stored on the side of Ru. Thermal desorption-mass spectroscopy
results show that after loading with D<sub>2</sub>, Ru/Li<sub>2</sub>O exhibits an extra desorption peak, which is in contrast to Ru nanoparticles
or ball-milled Li<sub>2</sub>O alone, indicating a synergistic hydrogen
storage effect due to the presence of both phases. By varying the
ratio of the two phases, it is shown that the effect increases monotonically
with the area of the heterojunctions, indicating interface related
hydrogen storage. X-ray diffraction, Fourier transform infrared spectroscopy,
and nuclear magnetic resonance results show that a weak LiO···D
bond is formed after loading in Ru/Li<sub>2</sub>O nanocomposites
with D<sub>2</sub>. The storage–pressure curve seems to favor
H<sup>+</sup>/H<sup>–</sup> over H<sup>+</sup>/e<sup>–</sup> mechanism
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