Results 171 to 180 of about 60,238 (275)

Metal-Free Active Template: A Straightforward Route to 4-Aminopyridinium-Based Rotaxane Molecular Shuttles. [PDF]

Angew Chem Int Ed Engl
Stoyanov I, van der Lee A, Coutrot F.
europepmc   +1 more source

Sulfur‐Bridged Cationic and Neutral [6]Helicenes: Chiral Trityls With Property and Stability Twists

ChemistryEurope, Volume 4, Issue 10, October 2026.
Replacing oxygen or nitrogen bridges with sulfur reshapes cationic [6]helicenes and simultaneously tunes their reactivity, photophysics, and configurational dynamics. Sulfur bridging increases helical curvature and electrophilicity, narrows electronic gaps to promote redshifted absorption and emission with larger Stokes shifts, yet unexpectedly lowers ...
Aurélien Chignac, Céline Besnard, Caterina Monti, Francesco Zinna, Gennaro Pescitelli, Jérôme Lacour   +5 more
wiley   +1 more source

Positional isomerization of pyridine through nitrogen transposition. [PDF]

Nature
Choi W, Ju H, Park J, Hong S.
europepmc   +1 more source

Stereoretentive Nucleophilic Aromatic Substitution Accesses Atropisomeric 4‐Amino‐N‐Arylquinolinium Salts

Chemistry – A European Journal, Volume 32, Issue 37, 1 October 2026.
Quinolin‐4‐ones were converted to chloroquinolinium salts, allowing formation of axially chiral aminoquinolinium salts via an enantioretentive SNAr reaction with a variety of amine nucleophiles. The salts have a high rotational barrier, with a racemization half‐life of ∼1000s of years.
Darren Holmes, Nia Foster, Saima Ansari, Paul Kavanagh, Paul Dingwall, Peter C. Knipe   +5 more
wiley   +1 more source

Efficient and versatile supramolecular functionalization of polysilicon microchips with cationic amphiphile salts for incorporation of therapeutics. [PDF]

Mikrochim Acta
Alea-Reyes ME, Bagherpour S, Duch M, Plaza JA, Pérez-García L.   +4 more
europepmc   +1 more source

Nitrooxylation in Organic Synthesis: From Classical Nitrate Ester Formation to Modern Catalytic Strategies

Chemistry – A European Journal, Volume 32, Issue 37, 1 October 2026.
Nitrooxylation—the installation of nitrate esters (–ONO2) has evolved from classical mixed‐acid protocols to catalytic and mechano‐, flow‐, photo‐, and electrochemical strategies. This review delineates ionic and radical manifolds for C–ONO2 bond formation, emphasizing mechanistic control, selected substrate scope, and selectivity.
Jayanta Dey, Dmitry Katayev
wiley   +1 more source

Supramolecular Polymerization and Morphological Transformation of Dynamic Helical Poly(Phenylacetylene)s via Chain‐End Host–Guest Interactions

Angewandte Chemie, Volume 138, Issue 40, 28 September 2026.
A helical polymer whose chain ends are connected through pillar[5]arene‐based host–guest interactions translates molecular helicity into supramolecular morphology. Solvent‐triggered helicity inversion accompanied by changes in chain rigidity switches the supramolecular architecture between cyclic and rigid‐rod nanostructures.
Tatsuya Nishimura, Haru Nozue, Feng Li, Tomoki Ogoshi, Katsuhiro Maeda   +4 more
wiley   +2 more sources

Two atoms at once: ligand skeleton expansion by a -CN- unit <i>via</i> nitrile insertion into the pyridinium amidate backbone of platinum complexes.

Dalton Trans
Burri LK, Shishkina S, Albrecht M.
europepmc   +1 more source

Expanding the Trifluoroborate Toolbox: Pyridinium Scaffolds for PET Tracer Development. [PDF]

ACS Cent Sci
Wong AAWL, Perrin DM.
europepmc   +1 more source

Assembly and Properties of Donor/Acceptor–Functionalized 2,6‐Bisethynylpyridines; Investigations of Through‐Bond and Through‐Space Charge Transfer Behavior

Journal of Physical Organic Chemistry, Volume 39, Issue 10, October 2026.
Introduction of a cation to donor/acceptor‐functionalized 2,6‐bisethynylpyridines results in through‐space interaction of donor and acceptor units. The electronic effects of this organization are explored using 1H‐NMR and UV‐vis spectroscopies. ABSTRACT Introduction of Ag(I) cations to 2,6‐bisethynylpyridine units decorated with electron‐donating (N,N ...
Jarod T. Sjoquist, Noah A. Grinde, Maggie A. Schultz, Olivia J. Schwarz, John T. Nabors, Nathaniel P. Litts, Joseph D. Scanlon, Eric Bosch, Nathan P. Bowling   +8 more
wiley   +1 more source