Bright NIR-Emitting Styryl Pyridinium Dyes with Large Stokes’ Shift for Sensing Applications
Biosensors, 2023 Two NIR-emitting donor-π-acceptor (D-π-A) type regioisomeric styryl pyridinium dyes (1a–1b) were synthesized and studied for their photophysical performance and environment sensitivity. The two regioisomers, 1a and 1b, exhibited interesting photophysical
Nirasha I. Wickramasinghe +5 more
doaj +1 more source
A Pyridinium Ylide-alkylation Strategy for the Structural Diversification of N-Carbamoyl Pyridinium Salts [PDF]
A pyridinium-ylide alkylation strategy has been developed for accessing N,N-disubstituted carbamoyl pyridinium salts that possess multiple nucleophilic sites.
Michael, Taylor +2 more
core +2 more sources
Investigation of the Pyridinium Ylide—Alkyne Cycloaddition as a Fluorogenic Coupling Reaction
Molecules, 2016 The cycloaddition of pyridinium ylides with alkynes was investigated under mild conditions. A series of 13 pyridinium salts was prepared by alkylation of 4-substituted pyridines.
Simon Bonte +4 more
doaj +1 more source
Highly Electron-Deficient Pyridinium-Nitrones for Rapid and Tunable Inverse-Electron-Demand Strain-Promoted Alkyne-Nitrone Cycloaddition to Bicyclo[6.1.0]nonyne [PDF]
, 2019 Highly accelerated inverse-electron-demand strain-promoted alkyne-nitrone cycloaddition (IED SPANC) between a sta- ble cyclooctyne (bicyclo[6.1.0]nonyne (BCN)) and nitrones delocalized into a Cα-pyridinium functionality is reported, with the ...
Alexander M., Polgar +4 more
core +1 more source
Advanced Functional Materials, EarlyView.A new class of sulfur‐free, oxygen‐bridged dibenzofuran‐based polymers is developed for ultrahigh‐refractive‐index applications. The rigid π‐extended architecture and enhanced molecular polarizability enable exceptional optical performance, combining refractive indices up to 1.848 with high Abbe numbers and full visible transparency. This work offers a
Hend A. Hegazy +5 more
wiley +1 more source
Hyperpolarization of Pyridine 15N‐Oxide Molecular Probes Enabled by Parahydrogen
Angewandte Chemie, EarlyView.Pyridine 15N‐oxides are introduced as motifs for hyperpolarization studies and biochemical applications are demonstrated. ABSTRACT Magnetic resonance (MR) is a powerful non‐invasive technique for probing structural, functional, and metabolic processes with high spatial and temporal resolution.
Ruhuai Mei +8 more
wiley +2 more sources
Regioselective Alkylation of Pyridinium Riboses [PDF]
European Journal of Organic Chemistry, 2020 The nucleophilic addition of alkyl, benzyl, and allyl organozinc reagents to protected pyridinium riboses proceeds under mild conditions and with yields of > 90 % in several cases and complete regioselectivity for the 4‐position.
Farbod Salahi, Olaf Wiest
openaire +2 more sources
Simplexidine, a 4-Alkylpyridinium Alkaloid from the Caribbean Sponge Plakortis simplex
Molecules, 2008 Chemical analysis of the secondary metabolites of the Caribbean sponge Plakortis simplex, a source of many bioactive compounds, showed the presence of the new metabolite simplexidine (4), belonging to the extremely rare class of 4-alkyl-pyridinium ...
Orazio Taglialatela-Scafati +3 more
doaj +1 more source
Amination of Phenols and Halophenols via Pyridinium–Iridium Dual Photocatalysis [PDF]
In this study, we present a photochemical method for the amination of phenols (C–H) and halophenols (SNAr), facilitated by dual catalytic pathways involving both Ir(III) photocatalysis and phenol–pyridinium EDA complexation. By incorporating a pyridinium
Marisa C., Kozlowski +3 more
core +2 more sources
Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal [PDF]
, 2004 Pyridinium perchlorate and pyridinium fluoroborate were grown and their successive phase transitions were studied by means of polarized microscopic observations and measurements of linear birefringence temperature changes.
Czapla, Z., Kosturek, B.
core +1 more source