Results 131 to 140 of about 18,424,176 (360)

Interior and Exterior Boron Doping in Functional Azacalixarenes Triggering Narrowband Delayed Fluorescence

Advanced Optical Materials, EarlyView.
A unique regioselective interior/exterior borylation strategy is presented for the one‐shot synthesis of two distinct organoboron luminophores from a common macrocyclic azacalix[3]arene. This interior/exterior borylation imparts the material with remarkable TADF properties and narrowband emission capabilities, spanning the violet to blue spectral ...
Sudhir K. Keshri, Hiroko Nomura, Takuma Yasuda   +2 more
wiley   +1 more source

Direct Access to α,β‐Unsaturated γ‐Lactams via Palladium‐Catalysed Carbonylation of Propargylic Ureas.

Advanced Synthesis &Catalysis, Volume 367, Issue 5, March 4, 2025.
Abstract Additive carbonylations typically necessitate strong nucleophiles, such as alcohols or amines. In this study, we carbonylated a poorly nucleophilic urea, under oxidant‐free conditions. Our straightforward carbonylative strategy enables access to versatile α,β‐unsaturated γ‐lactams featuring an aminocarbonyl fragment, utilizing readily ...
Debora Schiroli, Aleksandr Voronov, Francesco Pancrazzi, Nunzio Iraci, Salvatore Vincenzo Giofrè, Beatrice Macchi, Valeria Stefanizzi, Raffaella Mancuso, Bartolo Gabriele, Paolo Pio Mazzeo, Luca Capaldo, Nicola Della Ca'   +11 more
wiley   +1 more source

Naturally occurring epoxy acids: i. detection and evaluation of epoxy fatty acids by paper, thin-layer, and gas-liquid chromatography*†

Journal of Lipid Research, 1961
Chromatographic procedures for the detection and evaluation of oxygenated fatty acids are described. Emphasis has been placed on epoxy acids, but these methods promise to be of great value in studies of all classes of oxygenated acids.
Lindsay J. Morris, Ralph T. Holman, Krister Fontell   +2 more
doaj  

THE SEPARATION AND IDENTIFICATION OF MIXTURES OF C21 AND C19 STEROIDS BY PAPER CHROMATOGRAPHY

, 1953
Leonard R. Axelrod
openalex   +1 more source

A method for the estimation of micro amounts of amino nitrogen and its application to paper partition chromatography [PDF]

, 1949
A. J. Woiwod
openalex   +1 more source

Improving the Photochemical Skeletal Enlargement of Pyridines to 1,2‐Diazepines with Isocyanates

Advanced Synthesis &Catalysis, Volume 367, Issue 5, March 4, 2025.
Abstract In this work, we extend the one‐pot protocol to synthesize 1,2‐diazepines from commercially available and cheap starting materials. Capitalizing on isocyanate derivatives as activating agents, the photochemical skeletal enlargement occurs, while preserving key functional groups embedded in more than 30 substrates.
Clément Ghiazza, Aurélie Damond, Jérôme Marrot, Xavier Moreau   +3 more
wiley   +1 more source

Quantitative Paper Chromatography of Carotenoids. [PDF]

, 1959
Arne Jensen, Synnøve Liaaen Jensen, Lars Gunnar Sillén, Georg Andersson, Einar Stenhagen, H. Palmstierna   +5 more
openalex   +1 more source

Visible Light‐Promoted Esterification of Carboxylic Acids via Photoacid Generation Catalysis

Advanced Synthesis &Catalysis, EarlyView.
A novel, environmentally friendly photochemical method for the esterification of carboxylic acids with alcohols using arylazo sulfones as photoacid generators was developed. This approach avoids traditional acidic catalysts, purification did not require chromatography and the method proved effective under continuous flow conditions for enhanced ...
Valentina Benazzi, Periklis X. Kolagkis, Lorenzo di Terlizzi, Eirini M. Galathri, Olga G. Mountanea, Maurizio Fagnoni, Stefano Protti, Christoforos G. Kokotos   +7 more
wiley   +1 more source

Water‐Mediated 1,7‐Palladium Aryl‐to‐Aryl Migration in an Unusual Aryne Trimerization Enables the Synthesis of Multihelicenes with Profoundly Hindered Stereogenic Axes

Advanced Synthesis &Catalysis, EarlyView.
In the presence of a Pd0 catalyst, large π‐extended arynes trimerize in an unusual manner to forge extremely compact and strained chiral benzenoids. This new trimerization reaction involves a 1,7‐Pd isomerization, a rare and poorly understood process that is elucidated.
Albert Artigas, Manuel A. Ortuño, Jesús Castro‐Esteban, Michel Giorgi, Diego Peña, Dolores Pérez, Yoann Coquerel   +6 more
wiley   +1 more source

Solvent‐ and Transition Metal‐Free Mechanochemical Synthesis of 2‐Thiazolines and S‐Thiocarbamates

Advanced Synthesis &Catalysis, EarlyView.
Solvent‐ and transition metal‐free synthetic pathways for obtaining 2‐thiazolines and S‐thiocarbamates, based on the mechanochemical process of addition of chloroalkyl iso(thio)cyanates to thiols catalyzed by cheap and commercially available K2CO3, are designed and optimized.
Kamil Hanek, Natalia Pietras, Dawid Frąckowiak, Patrycja Żak   +3 more
wiley   +1 more source