Results 61 to 70 of about 2,332 (255)

Shedding Light on the Precatalytic Mixture of Pd(OAc)2 and Cooperating Bipyridone Ligands for the C─H Functionalization of Arenes

ChemCatChem, EarlyView.
The reactions of the common palladium precursors Pd(OAc)2 and PdCl2 and cooperating bipyridone ligands leads to well defined complexes which are general precatalysts for the direct C─H arylation of arenes, more active than Pd(OAc)2/ligand mixtures in nonpolar solvents.
Francisco Villalba, Sara Martín‐Martín, Ana C. Albéniz   +2 more
wiley   +1 more source

43,44,47,48‐Tetrathiaoctaphyrin(2.1.1.1.2.1.1.1) and its Organometallic bis‐RhIII Complex: Coordination‐Driven Switching of Conformation and Aromaticity

ChemistryEurope, EarlyView.
A figure‐eight‐shaped tetrathiaoctaphyrin (left) undergoes reversible redox and conformational switching upon coordination to two Rh(III) centers, yielding a globally aromatic [38]annulene structure (right). The Rh2 complex, formed via fourfold CH metalation, displays rare isomerism driven by local helicity and axial ligand switching.
Sumit Sahoo, Marcin A. Majewski, Pallab Chatterjee, Marcin Stępień, Harapriya Rath   +4 more
wiley   +1 more source

TRNG Entropy Model in the Presence of Flicker FM Noise

Transactions on Cryptographic Hardware and Embedded Systems
Flicker Frequency Modulated (FM) noise, which influences free-running Ring Oscillators (ROs), can make a substantial contribution to the entropy generated by RO-based True Random Number Generators (TRNGs).
Adriaan Peetermans, Ingrid Verbauwhede
doaj   +1 more source

Identification of Pyrrolizilactone Biosynthetic Gene Cluster with Unique Short‐Chain Dehydrogenase Gene for 3‐Methylproline Formation

ChemistryEurope, EarlyView.
A standalone enzyme, derived from the reductase domain of a polyketide synthase‐nonribosomal peptide synthetase hybrid enzyme, is identified as a pyrroline carboxylate reductase. This enzyme is involved in the biosynthesis of 3‐methylproline, an amino acid building block of a unique tricyclic pyrrolizidinone structure of a fungal metabolite ...
Naoki Kato, Sayaka Hirosawa, Toshihiko Nogawa, Kiyomi Kinugasa, Tohru Taniguchi, Hiroyuki Osada, Shunji Takahashi   +6 more
wiley   +1 more source

A Note on 5-bit Quadratic Permutations’ Classification

IACR Transactions on Symmetric Cryptology, 2017
Classification of vectorial Boolean functions up to affine equivalence is used widely to analyze various cryptographic and implementation properties of symmetric-key algorithms.
Dušan Božilov, Begül Bilgin, Hacı Ali Sahin   +2 more
doaj   +1 more source

B12‐Cofactor Inactivation by Cobalt to Rhodium Mutation in Methylrhodibalamin: An Antivitamin B12 and Antibiotic

ChemistryEurope, EarlyView.
Replacement of cobalt in the organometallic B12‐cofactor methylcobalamin (MeCbl) by rhodium furnishes a structural mimic with a significantly stronger metal–carbon bond. This synthetically challenging formal metal‐mutation converts the naturally optimized biological methyl‐transfer catalyst MeCbl into a designed antivitamin B12, an inactivated B12 ...
Florian J. Widner, Klaus Wurst, Markus Ruetz, Christoph Kieninger, Christoph Kreutz, Michael D. Paxhia, Evelyne Deery, Martin J. Warren, Bernhard Kräutler   +8 more
wiley   +1 more source

Efficiently Processing Complex-Valued Data in Homomorphic Encryption

Journal of Mathematical Cryptology, 2020
We introduce a new homomorphic encryption scheme that is natively capable of computing with complex numbers. This is done by generalizing recent work of Chen, Laine, Player and Xia, who modified the Fan–Vercauteren scheme by replacing the integral ...
Bootland Carl, Castryck Wouter, Iliashenko Ilia, Vercauteren Frederik   +3 more
doaj   +1 more source

Water‐Soluble Peptoids with Two Different Binding Sites for Strong ATP Chelation

Chemistry – A European Journal, EarlyView.
ATP is key for activating enzymes associated with cancer. A potential therapeutic approach is strong binding of ATP, making it unavailable to enzymes. The water‐soluble peptoid P1‐TB incorporates two synergistic binding sites for ATP: terpyridine‐Zn²⁺ and 4‐CPBA that bind ATP's phosphate and diol groups, respectively, and exhibits an exceptional Kᴅ‐ATP
Nicole Vorobyov, Galia Maayan
wiley   +1 more source

A Water Stable U(IV) Complex Based on a Macrocyclic Ligand Displaying NIR Emission

Chemistry – A European Journal, EarlyView.
A water‐stable U(IV) complex is obtained by coordination of U(IV) with a nonadentate macrocyclic ligand based on a triazacyclononane platform. The U(IV) cation is fully protected from coordination of water molecules, and upon excitation into the UV‐Visible region, the complex displays an unprecedented NIR emission from U(IV). Abstract Complexation of U(
Elsa Jourdain, Mehdi Arab, Carlos Platas‐Iglesias, David Esteban‐Gómez, Louise S. Natrajan, Alexandre Lecointre, Mourad Elhabiri, Loïc J. Charbonnière   +7 more
wiley   +1 more source

Security Analysis of BLAKE2’s Modes of Operation

IACR Transactions on Symmetric Cryptology, 2016
BLAKE2 is a hash function introduced at ACNS 2013, which has been adopted in many constructions and applications. It is a successor to the SHA-3 finalist BLAKE, which received a significant amount of security analysis.
Atul Luykx, Bart Mennink, Samuel Neves
doaj   +1 more source