Results 41 to 50 of about 31,425 (239)

Asymmetric synthesis of tri- and tetrasubstituted trifluoromethyl dihydropyranones from alpha-aroyloxyaldehydes via NHC redox catalysis [PDF]

open access: yes, 2014
We thank the Royal Society for a University Research Fellowship (A.D.S.), and the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013) ERC Grant Agreement No.
Davies, Alyn T.   +3 more
core   +4 more sources

Organocatalysis in total synthesis [PDF]

open access: yes, 2015
Peer ...
Herrera, Raquel P.   +1 more
core   +2 more sources

Matrix variate and tensor variate Laplace distributions [PDF]

open access: yesarXiv, 2021
In this article, we define a matrix variate asymmetric Laplace distribution. We prove some properties of the matrix variate asymmetric Laplace distribution. We prove the relationship between the matrix variate asymmetric Laplace distribution and other distributions. We define a matrix variate generalized asymmetric Laplace distribution.
arxiv  

Asymmetric organocatalysis involving double activation

open access: yesTetrahedron Chem, 2022
Asymmetric organocatalysis contributed tremendously to the field of organic synthesis since year 2000. Considering the diversity of organocatalysts and their activation modes, chemists developed the double activation strategy, in which two distinct ...
Zhi Chen   +3 more
doaj  

Pursuing Chemical Efficiency by Using Supported Organocatalysts for Asymmetric Reactions under Aqueous Conditions [PDF]

open access: yes, 2015
Over the past decade, a great effort has been made by the chemical community to improve the efficiency of organic transformations and allow sustainable processes.
Alonso, Diego A.   +6 more
core   +2 more sources

A note on asymmetric hypergraphs [PDF]

open access: yesarXiv, 2023
A $k$-graph $\mathcal{G}$ is asymmetric if there does not exist an automorphism on $\mathcal{G}$ other than the identity, and $\mathcal{G}$ is called minimal asymmetric if it is asymmetric but every non-trivial induced sub-hypergraph of $\mathcal{G}$ is non-asymmetric. Extending a result of Jiang and Ne\v{s}et\v{r}il, we show that for every $k$-graph, $
arxiv  

Organocatalytic Lewis base functionalisation of carboxylic acids, esters and anhydrides via C1-ammonium or azolium enolates [PDF]

open access: yes, 2014
This tutorial review highlights the organocatalytic Lewis base functionalisation of carboxylic acids, esters and anhydrides via C1-ammonium/azolium enolates.
Morrill, Louis C., Smith, Andrew D.
core   +1 more source

Cooperative effects between arginine and glutamic acid in the amino acid catalyzed aldol reaction [PDF]

open access: yes, 2017
Catalysis of the aldol reaction between cyclohexanone and 4-nitrobenzaldehyde by mixtures of L-Arg and of L-Glu in wet DMSO takes place with higher enantioselectivity (up to a seven-fold enhancement in the anti- aldol for the 1:1 mixture) than that ...
Moyano i Baldoire, Albert   +1 more
core   +1 more source

Nonlinear SVD with Asymmetric Kernels: feature learning and asymmetric Nyström method [PDF]

open access: yesarXiv, 2023
Asymmetric data naturally exist in real life, such as directed graphs. Different from the common kernel methods requiring Mercer kernels, this paper tackles the asymmetric kernel-based learning problem. We describe a nonlinear extension of the matrix Singular Value Decomposition through asymmetric kernels, namely KSVD. First, we construct two nonlinear
arxiv  

Cluster Preface: Non-Covalent Interactions in Asymmetric Catalysis [PDF]

open access: yes, 2016
The successful harnessing of non-covalent interactions to activate functional groups and control selectivity in chemical reactions is a relatively recent phenomenon in synthetic chemistry, but one that has delivered ground-breaking results, particularly ...
Phipps, RJ
core   +2 more sources

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