Results 71 to 80 of about 7,051 (128)

Aromaticity‐Induced Spin State Switching and High‐Spin States in Non‐Alternant Polyradicals

Journal of Computational Chemistry, Volume 47, Issue 10, 15 April 2026.
The peculiar topology of some non‐alternant systems allows such a degree of freedom in favored spin‐alignment between unpaired electrons that the polyradical can be in low‐, intermediate‐, and high‐spin ground state. Thus, the modulation of resonance energy upon distortions of pro‐aromatic units via external stimuli may result in switching the lowest ...
Sergi Betkhoshvili, Ibério de P. R. Moreira, Jordi Poater, Josep Maria Bofill   +3 more
wiley   +1 more source

Synthesis of Polyhydroxylated Pyrrolidinyl Analogs of Sugar Nucleotides. Experimental and Computational Studies on Their Interactions With GalNAC‐T's

ChemBioChem, Volume 27, Issue 7, 14 April 2026.
A multidisciplinary approach based on organic synthesis supported by quantum mechanical calculations, efficient phosphorylation methods, affinity studies using conventional techniques and saturation transfer difference nuclear magnetic resonance, together with molecular dynamics simulations, has enabled the preparation of nucleotide analogs with ...
Pedro Merino, Veronica Juste, Alejandro Montesa, Sandra Pereira, Sara Orta, Manuel Pedrón, Ana I. Jiménez, Sonsoles Martín‐Santamaría, Ramón Hurtado‐Guerrero, Ignacio Delso, Tomás Tejero   +10 more
wiley   +1 more source

ROTENOIDES BIOACTIVOS DE LA RAÍZ DE Lonchocarpus pentaphyllus

Tecnociencia, 2005
  Mediante el fraccionamiento bio-dirigido del extracto hexánico de las raíces del Lonchocarpus pentaphyllus se aislaron cuatro rotenoides conocidos: milletona (1), milletosina (2), deguelina (3) y tephrosina (4).
Marcelino Gutiérrez G, Haydée Watson-Samudio, Eligio Vega A, Luis Cubilla R   +3 more
doaj  

2, 4-Dinitrofenilhidrazonas de ß-halocetoesteres alilicos

Revista de Química, 1990
No contiene resumen.
Oscar Sánchez
doaj  

Synthesis, crystal structure and absolute configuration of (3aS,4R,5S,7aR)-7-(but-3-en-1-yn-1-yl)-2,2-dimethyl-3a,4,5,7a-tetrahydro-2H-1,3-benzodioxole-4,5-diol

Acta Crystallographica Section E: Crystallographic Communications
The absolute configuration of the title compound, C13H16O4, determined as 1S,2R,3S,4R based on the synthetic pathway, was confirmed by single-crystal X-ray diffraction.
Alejandro Peixoto de Abreu Lima, Enrique Pandolfi, Valeria Schapiro, Leopoldo Suescun   +3 more
doaj   +1 more source

Estudio químico del phthirus pyrifolia "suelda con suelda"

Revista de Química, 1990
Se realizaron estudios químicos de los extractos con éter de petróleo ( 40-600C), clorofonno y etanol de Phthirus pyrifolia (HBK) Eichl, una especie semiparásita de la familia Lorantaceae.
Betty Chung Tong, Olga Lock de Ugaz
doaj  

Una nueva familia de módulos estructurales para el reconocimiento molecular

Revista de Química, 1998
Un conjunto de fenómenos gobernados por interacciones de naturaleza no covalente han dado lugar al concepto del Reconocimiento Molecular, fenómeno que es algo más que una simple asociación de dos entidades químicas.
Juana Robles Caycho
doaj  

Synthesis of 2,2-diphenyl-1,3,2-oxazaborolidin-5-one promoted by montmorillonite and microwaves: A green approach methodology

Results in Chemistry
Studies have shown that the heterocyclic molecules of the 2,2-diphenyl-1,3,2-oxazaborolidin-5-one (DPOXA) type have wide and varied biological activity with herbicidal, insecticidal, fungicidal, antibacterial, and apoptotic properties.
Rodrigo González-Castañeda, Omar Negrellos Correa, Raquel Gómez-Pliego, Alan Álvarez-Sánchez, Anuar Gómez-Tagle, Benjamín Velasco-Bejarano   +5 more
doaj   +1 more source

DNA Interactions and Biological Activity of 2,9-Disubstituted 1,10-Phenanthroline Thiosemicarbazone-Based Ligands and a 4-Phenylthiazole Derivative

Biology
Four 1,10-phenanthroline derivatives (1–4) were synthesized as potential telomeric DNA binders, three substituted in their chains with thiosemicarbazones (TSCs) and one 4-phenylthiazole derivative.
Álvaro Nicolás, Julia G. Quero, Marta Barroso, Zoila Gándara, Lourdes Gude   +4 more
doaj   +1 more source

SÍNTESIS SELECTIVA DEL PRECURSOR DE COMPUESTOS BIOACTIVOS 4-METIL-2-QUINOLONA EMPLEANDO EL REACTIVO DE EATON

Avances en Ciencias e Ingeniería, 2019
In this paper the use of Eaton´s reagent for the selective synthesis of 4-methyl-2-quinolone is described, avoiding the use of mineral acids and expensive metal catalysts such as those described in the literature. This reagent is easily available and has
Gisela C. Muscia, Ayelen Luczywo, Juan P. Carnevale, Graciela Y. Buldain, Silvia E. Asís   +4 more
doaj