Results 21 to 30 of about 33,029 (246)

Amidochromenes for Promising Antileishmanial Activity

open access: yesNatural Product Communications, 2017
Numerous natural products having a 2,2-dimethylchromene (2,2-dimethylbenzopyrane) structural element present interesting biological activities that may, therefore, be considered as privileged pharmacophore.
Abdelhak Neghra   +5 more
doaj   +1 more source

An unprecedented palladium-arsenic catalytic cycle for nitriles hydration

open access: yesFrontiers in Chemistry, 2023
An unprecedented palladium/arsenic-based catalytic cycle for the hydration of nitriles to the corresponding amides is here described. It occurs in exceptionally mild conditions such as neutral pH and moderate temperature (60°C).
Damiano Cirri   +2 more
doaj   +1 more source

Synthesis of methylenebisamides using CC- or DCMT-activated DMSO

open access: yesBeilstein Journal of Organic Chemistry, 2008
Bisamides are key fragments for the introduction of gem-diaminoalkyl residues into retroinverso pseudopeptide derivatives and in the synthesis of peptidomimetic compounds. The literature methods for these types of compounds have certain drawbacks.
Qiang Wang   +3 more
doaj   +1 more source

NaY Zeolite: A Useful Catalyst for Nitrile Hydrolysis

open access: yesMolecules, 2000
The NaY zeolite catalysed hydrolysis of nitriles to primary amides is reported. It is found that aryl nitriles with strong electron-withdrawing substituents and cyanopyridines are readily hydrolysed in the water suspension, while aliphatic nitriles do ...
Bogdan A. Å olaja   +3 more
doaj   +1 more source

Palladium-Catalyzed Site-Selective Fluorination of Unactivated C(sp3)−H Bonds [PDF]

open access: yes, 2015
The transition-metal-catalyzed direct C–H bond fluorination is an attractive synthetic tool toward the preparation of organofluorines. While many methods exist for the direct sp3 C–H functionalization, site-selective fluorination of unactivated sp3 ...
Ge, Haibo   +3 more
core   +4 more sources

Elastic modulus in the crystalline region of poly(p-phenylene terephthalamide) [PDF]

open access: yes, 1976
Fibres from aromatic polyamides have a much higher Young's modulus than fibres from aliphatic polyamides. In order to contribute to the explanation of this observed difference we looked at one of the ultimate properties, the elastic modulus in the ...
Bantjes, A.   +3 more
core   +3 more sources

An update on the synthesis and reactivity of spiro-fused β-lactams [PDF]

open access: yes, 2018
Beta-Lactam ring-containing compounds play a pivotal role in drug design and synthetic chemistry. Spirocyclic beta-lactams, representing an important beta-lactam subclass, have recently attracted considerable interest with respect to new synthetic ...
D'hooghe, Matthias, Dao Thi, Hang
core   +1 more source

A two-step approach to achieve secondary amide transamidation enabled by nickel catalysis. [PDF]

open access: yes, 2016
A long-standing challenge in synthetic chemistry is the development of the transamidation reaction. This process, which involves the conversion of one amide to another, is typically plagued by unfavourable kinetic and thermodynamic factors. Although some
Anthony, Sarah M   +4 more
core   +2 more sources

Synthesis, Docking Studies and Acetylcholinesterase Inhibition of Open-Chain Carbohydrate Amides

open access: yesMedical Sciences Forum, 2022
Alzheimer’s disease (AD) is the most common age-related cause of dementia among elderly people. AD is a severe neurodegenerative disorder characterized by progressive memory and cognition loss that leads to disability and inevitably to death and is ...
Maria Isabel Ismael   +6 more
doaj   +1 more source

Three-electron two-centred bonds and the stabilisation of cationic sulfur radicals [PDF]

open access: yes, 2014
Electronic communication in biological systems is fundamental to understanding protein signalling and electron hopping pathways. Frequently studied examples are cationic radical methionine and its functional derivatives.
Carbery, DR, Hendon, CH, Walsh, A
core   +3 more sources

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