Results 101 to 110 of about 36,278 (230)

The Role of Chemistry Across Disciplines From Humanities to Life Sciences in Understanding Complexity and Emergence

Angewandte Chemie, Volume 138, Issue 17, 20 April 2026.
This study explores the origins of life by linking prebiotic chemistry, the emergence of information‐carrying molecules such as RNA and proteins, and philosophical questions about consciousness. The study emphasizes the role of molecular evolution in the Central Dogma and provides insights into the chemical origins of biology and the basis of life's ...
Harald Schwalbe, Josef Wachtveitl, Alexander Heckel, Florian Buhr, Sabrina Toews, Thomas M. Schimmer   +5 more
wiley   +2 more sources

The Structure of Carboxyl Methyltransferase Provides Insights Into the Substrate Specificity and Divergent Evolution of Iridoid

Plant Biotechnology Journal, EarlyView.
ABSTRACT Iridoids constitute a prominent class of plant‐specialised metabolites, with carbocyclic iridoids (e.g., geniposide) and secoiridoids (e.g., loganin) diverging early in their biosynthetic pathways. This divergence is marked by substrate‐specific carboxyl methyltransferases—GjGAMT and CrLAMT—that catalyse the decisive methylation step in ...
Li Li, Zhiteng Luo, Zhaoyin He, Jie Tang, Wuke Wei, Ruoting Zhan, Huihao Zhou, Dongming Ma   +7 more
wiley   +1 more source

Investigating the Reactivity and Selectivity in Nucleophilic Fluorination of Secondary Alkyl Bromides and Mesylates: Assessment of the Effect of Counterion and Bulky Alcohols

European Journal of Organic Chemistry, Volume 29, Issue 17, 5 May 2026.
Hydrogen bonding provided by pinacol or 2‐trifluoromethyl‐2‐propanol enhances the selectivity of nucleophilic fluorination of several secondary alkyl bromides or mesylates. Synthesis of secondary alkyl fluorides via nucleophilic substitution faces the problem of high competition with E2 processes. This competition depends on the chemical environment of
Eloah P. Ávila, Luis F. Resende, Mauro V. de Almeida, Josefredo R. Pliego   +3 more
wiley   +1 more source

Kinetic Study on the Base-Catalyzed Imine-Enamine Tautomerism of a Chiral Biologically Active Isoxazoline Derivative by HPLC on Amylose Tris(3,5-dimethylphenylcarbamate) Chiral Stationary Phase. [PDF]

Molecules, 2023
Sadutto D, Guglielmi P, Carradori S, Secci D, Cirilli R.   +4 more
europepmc   +1 more source

Dearomatization with Axial‐to‐Central Chirality Conversion

European Journal of Organic Chemistry, Volume 29, Issue 17, 5 May 2026.
Atropisomers are exciting synthetic targets with unique properties, which find applications in many fields of chemistry. However, considering them as substrates is not very frequent, notably in the context of dearomatization reaction. We wish to discuss the different strategies for the dearomatization of aromatic atropisomers with axial‐to‐central ...
Morgane Mando, Clément Lemaitre, Thierry Constantieux, Xavier Bugaut   +3 more
wiley   +1 more source

Chiral Heptagon‐Embedded Double [6]Helicenes via Scholl Reaction

Angewandte Chemie, Volume 138, Issue 16, 13 April 2026.
One bond makes the difference–two chiral and twisted polycyclic aromatic hydrocarbons (PAHs) show different emission behavior. The more flexible one (top) shows a double emission with one having a large anti‐Stokes shift. The two peaks are assigned to different conformers of one and the same compound.
Dan Wang, Philipp Penert, Lars Schneider, Moritz P. Schuldt, Frank Rominger, Felix Deschler, Michael Mastalerz   +6 more
wiley   +2 more sources

[Preparation of porous organic cage and its use as chiral stationary phase for capillary electrochromatography]. [PDF]

Se Pu, 2023
Zheng KN, Qin GZ, Jiang XF, Zhang JH, Yuan LM.   +4 more
europepmc   +1 more source

Spectroscopy and Conformer‐Selective Photoelectron Circular Dichroism of Chiral Molecules

Chemistry – An Asian Journal, Volume 21, Issue 9, 14 May 2026.
Photoelectron circular dichroism (PECD) is a forward–backward asymmetry in the angular distribution of the electrons emitted by a chiral molecule ionized by a circularly polarized light (CPL). Its sensitivity to conformation is studied by one‐photon or resonance‐enhanced two‐photon ionization, the latter being conformer‐selective.
Laurent Nahon, Anne Zehnacker
wiley   +1 more source

Manganese Porphyrin‐Catalyzed One‐Pot Oxidation of Lupeol: Efficient Conversion of Its Terminal Alkene Into Carboxylic Acids

Chemistry &Biodiversity, Volume 23, Issue 5, May 2026.
Manganese porphyrin catalyst enables green PhI(OAc)2 oxidation of lupeol in ethyl acetate, achieving 94% conversion and the formation of eight products, including selective C20 olefin transformations and one‐pot conversion of the isopropenyl group to carboxylic acids, all without the need of C3‐OH protection step.
Leila Renan Oliveira, Pedro Fonseca‐Pinheiro, Lucienir Pains Duarte, Diogo Montes Vidal, Grasiely Faria de Sousa, Dayse Carvalho da Silva Martins   +5 more
wiley   +1 more source

Separation of 4-substituted 5-methylpiracetam stereoisomers on polysaccharide-based chiral stationary phases

Journal of Chromatography Open
Monitoring of stereoisomer content in samples containing chiral compounds with multiple chiral centers is an important and challenging task in chiral liquid chromatography.
H. Kažoka, B. Turovska, T. Upmanis
doaj   +1 more source