Results 71 to 80 of about 19,273 (245)

METALLOCENE BIS(AZA-CROWN ETHER) LIGANDS AND RELATED-COMPOUNDS - THEIR SYNTHESES, COORDINATION CHEMISTRY, AND ELECTROCHEMICAL PROPERTIES

, 1990
The syntheses of new ferrocene and ruthenocene bis(aza-crown ethers) (11)-(14) containing amide bond linkages between the metallocene redox centre and aza-15-crown-5 (1,4,7,10-tetraoxa-13-azacyclopentadecane) and aza-18-crown-6 (1,4,7,10,13-pentaoxa-16 ...
MCALEER, J, BLACKBURN, C, BEER, P, SIKANYIKA, H, KEEFE, A   +4 more
core   +1 more source

Monosubstituted N‐Arylhydroxylamine Chemistry: Integrating Contemporary Synthetic Approaches for the Efficient Construction of Diverse Heterocyclic Scaffolds

Chemistry – A European Journal, EarlyView.
Monosubstituted N‐arylhydroxylamines represent a unique subclass of hydroxylamines that act as pivotal intermediates in redox transformations and as versatile platforms for further synthetic transformations. They serve as key building blocks in the synthesis of architecturally complex heterocycles and other valuable organic compounds.
Michael G. Kallitsakis, Kyriakos D. Nikopoulos, Ioannis N. Lykakis   +2 more
wiley   +1 more source

Cationic Permethylated Cyclodextrins Capable of Self‐Assembling Into Linear Nanostructures in Water

Chemistry – A European Journal, EarlyView.
A quaternary ammonium bridge equipped with a lipophilic substituent in permethylated cyclodextrins suppresses undesired supramolecular interactions and promotes controlled, directional head‐to‐tail self‐assembly into well‐defined linear nanostructures.
Maxime Kolb, Marvin Benjaffel, Peter Faller, Laurent Raibaut, Dominique Armspach   +4 more
wiley   +1 more source

The chemistry of aza-enediynes, aza-enyne allenes, and related aza-Bergman and aza-Myers-Saito rearrangements

, 2005
textNaturally occurring enediynes are a class of potent antibiotic antitumor agents that cleave DNA by generating reactive diradicals via the Bergman cyclization or MyerSaito type cyclization.
Feng, Liping
core  

Strain Release of 1‐Azabicyclo[1.1.0]butanes as a Gateway to Highly Functionalized Azetidines: New Strategies and Structural Motifs

Chemistry – A European Journal, EarlyView.
Over the past decade, the interest in azetidines has continuously risen, by virtue of their highly appealing pharmaceutical properties. Monocyclic, spirocyclic, and bridged azetidines can be accessed by leveraging 1‐azabicyclo[1.1.0]butanes as precursors.
Yuri Gelato, Philipp Natho, Marco Colella, Renzo Luisi   +3 more
wiley   +1 more source

Synthesis and coordination chemistry of neutral phospha(III)guanidines. Formation of 1-aza-3-phospha-4-metallacyclobut-1-ene rings at group 6 metals

, 2003
The neutral phospha(III)guanidine compounds, Ph2PC{NR} {NHR} (1a, R = Cy; 1b, R = iPr), are reported. NMR spectroscopic data indicated the presence of the Esyn isomer in solution and structural studies confirmed this in the solid-state.
Joanna Grundy (2444977), Grundy, Joanna, Coles, Martyn P., Hitchcock, Peter B., Martyn P Coles (14018547), Peter B Hitchcock (16057433)   +5 more
core   +1 more source

Flipping the Card With Enantiodivergent Organocatalysis

Chemistry – A European Journal, EarlyView.
This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre, Alessio Carioscia, Alessandro Brusa, Armando Carlone   +3 more
wiley   +1 more source

Antitumor AZA-anthrapyrazoles: biophysical and biochemical studies on 8-aza and 9-aza regioisomers

, 2004
Aza-bioisosteres of anthrapyrazoles (Aza-APs) bearing the C–N substitution at position 9 are powerful anticancer agents now in clinical trials. In contrast, their 8-substituted regioisomers are practically devoid of chemotherapeutic effects.
Ernesto Menta, LEO, ELISABETTA, MENTA E., Manlio Palumbo, M. Palumbo, E. Leo, A.Paul Krapcho, MANCIA, Annalaura, Elisabetta Leo, Giovanni Capranico, S. Moro, SISSI, CLAUDIA, MANCIA A., Claudia Sissi, MORO, STEFANO, C. Sissi, Stefano Moro, A. P. Krapcho, CAPRANICO G., KRAPCHO A. P., E. Menta, G. Capranico, Annalaura Mancia, PALUMBO, MANLIO   +23 more
core   +1 more source

Analysis and Characterization of Kisspeptin and Its Analogues in Serum and Urine Samples by Liquid Chromatography–High‐Resolution Mass Spectrometry for Doping Control Purposes

Drug Testing and Analysis, EarlyView.
Sensitive LC‐HRMS methods were established for the detection of kisspeptin and its analogues in serum and urine, alongside their analytical and metabolic characterization. Stability studies were conducted in serum, plasma, and urine, highlighting the importance of appropriate sample handling for reliable anti‐doping analysis.
Sophia Krombholz, Linus Korsmeier, Andreas Thomas, Mario Thevis   +3 more
wiley   +1 more source

Aza-Wittig Reaction of N-Vinylic Phosphazenes with Carbonyl Compounds. Azadiene-Mediated Synthesis of Isoquinolines and 5,6-Dihydro-2H-1,3-oxazines

, 2016
N-Vinylic phosphazenes 4 are obtained by reaction of phosphorus ylide 5 and nitriles 6. Aza-Wittig reaction of phosphazenes 4 with aldehydes leads to the formation of 2-azadienes 1, which are easily converted into isoquinolines 2.
Francisco Palacios (1447132), Concepción Alonso (2532775), Gloria Rubiales (1795924)   +2 more
core   +1 more source