Results 151 to 160 of about 31,425 (239)

Infinite Families of Asymmetric Graphs [PDF]

arXiv, 2018
A graph $G$ is \textit{asymmetric} if its automorphism group of vertices is trivial. Asymmetric graphs were introduced by Erd\H{o}s and R\'{e}nyi in 1963. They showed that the probability of a graph on $n$ vertices being asymmetric tends to $1$ as $n$ tends to infinity.
arxiv  

Organocatalytic C–H activation reactions

Beilstein Journal of Organic Chemistry, 2012
Organocatalytic C–H activation reactions have recently been developed besides the traditional metal-catalysed C–H activation reactions. The recent non-asymmetric and asymmetric C–H activation reactions mediated by organocatalysts are discussed in this ...
Subhas Chandra Pan
doaj   +1 more source

AVANÇOS RECENTES NA HIDROAMINAÇÃO DE COMPOSTOS INSATURADOS

Química Nova
This review presents thermodynamics and kinetics aspects of the hydroamination reaction, recent advancements on this field for non-activated alkenes, alkynes and allenes, employing transition metal catalysis or organocatalysis, including activation by ...
Luiz F. T. Novaes, Julio C. Pastre
doaj   +1 more source

Local stability conditions for asymmetric Fermi superfluid [PDF]

arXiv, 2006
Two different local stability conditions for an asymmetric superfluid has been discussed in the literature. We here consider the relations between them.
arxiv  

Product of rectangular Toeplitz (Hankel) matrices [PDF]

arXiv
In this paper, we study products of asymmetric Toeplitz matrices, we give necessary and sufficient conditions for the product of two asymmetric Toeplitz matrices compatible sizes is asymmetric Toeplitz matrix. We also give some results related to the isometry.
arxiv  

DAG-based Consensus with Asymmetric Trust [Extended Version] [PDF]

arXiv
In protocols with asymmetric trust, each participant is free to make its own individual trust assumptions about others, captured by an asymmetric quorum system. This contrasts with ordinary, symmetric quorum systems and with threshold models, where all participants share the same trust assumption. It is already known how to realize reliable broadcasts,
arxiv  

Dynamic generalizations of the Asymmetric Inclusion Process, Asymmetric Brownian Energy Process and their Dualities [PDF]

arXiv
Two new interacting particle systems are introduced in this paper: dynamic versions of the asymmetric inclusion process (ASIP) and the asymmetric Brownian energy process (ABEP). Dualities and reversibility of these processes are proven, where the quantum algebra $\mathcal{U}_q(\mathfrak{su}(1,1))$ and the Al-Salam--Chihara polynomials play a crucial ...
arxiv  

Enantioselective α-heterofunctionalization reactions of catalytically generated C1-Lewis base enolates

Tetrahedron Chem
Chiral Lewis base (LB) organocatalysis has emerged as a powerful covalent catalysis concept which allows for highly selective asymmetric C–C and C-heteroatom bond formations.
Magdalena Piringer, Lotte Stockhammer, Lukas Vogl, David Weinzierl, Paul Zebrowski, Mario Waser   +5 more
doaj  

Asymmetric Organocatalysis: The Emerging Utility of α,β-Unsaturated Acylammonium Salts. [PDF]

Angew Chem Int Ed Engl, 2016
Vellalath S, Romo D.
europepmc   +1 more source

Amines vs. N-Oxides as Organocatalysts for Acylation, Sulfonylation and Silylation of Alcohols: 1-Methylimidazole N-Oxide as an Efficient Catalyst for Silylation of Tertiary Alcohols [PDF]

, 2015
Murray, JI, Spivey, AC
core   +1 more source