Results 51 to 60 of about 48,089 (168)

Fast Solvent-free Alkylation of Amides and Lactams under Microwave Irradiation

open access: yesMolecules, 1999
N-Substituted amides and lactams are rapidly N-alkylated under solvent-free phase-transfer catalytic conditions using microwaves.
Dariusz Bogdal
doaj   +1 more source

Constituintes químicos de Ottonia corcovadensis Miq. da floresta Amazônica: atribuição dos deslocamentos químicos dos átomos de hidrogênio e carbono Chemical constituents of Ottonia corcovadensis Miq. from Amazon forest: ¹h and 13c chemical shift assignments

open access: yesQuímica Nova, 2004
In an ethanolic extract of leaves of Ottonia corcovadensis (Piperaceae) were identified sixteen terpenoids of essential oil and the three flavonoids 3',4',5,5',7-pentamethoxyflavone (1), 3',4',5,7-tetramethoxyflavone (2) and 5-hydroxy-3',4',5',7 ...
Valdir A. Facundo   +2 more
doaj   +1 more source

Estimativa por DSC das entalpias de sublimação da etilenouréia e da propilenouréia: algumas correlações empíricas envolvendo amidas e tioamidas Estimative by DSC data of the sublimation enthalpies for ethyleneurea and propyleneurea: some empirical correlations with amides and tioamides

open access: yesQuímica Nova, 1999
By using DSC data, the enthaplies of sublimation for ethyleneurea and propyleneurea, are calculated as 84 and 89 kJ mol-1 respectively. Using the vaporization enthalpy values for dimethylethyleneurea and dimethylprophyleneurea, as obtained from ...
Robson Fernandes de Farias
doaj   +1 more source

Weinreb Amides as Directing Groups for Transition Metal-Catalyzed C-H Functionalizations

open access: yesMolecules, 2019
Weinreb amides are a privileged, multi-functional group with well-established utility in classical synthesis. Recently, several studies have demonstrated the use of Weinreb amides as interesting substrates in transition metal-catalyzed C-H ...
Jagadeesh Kalepu, Lukasz T. Pilarski
doaj   +1 more source

The study of the antimicrobial activity of 6-sulfonyl derivatives of 4-methyl-1,2- dihydroquinoline-2-one

open access: yesAnnals of Mechnikov's Institute, 2020
Experimental study of the antimicrobial activity of the nineteen new 6-R-sulfonyl derivatives of 4-methyl-1,2- dihydroquinolin-2-one has been carried out using the wells method and the serial dilution method in liquid medium.
T Tsapko
doaj  

Biotransformation of xenobiotics by mycelium of Laricifomes officinalis (Polyporales, Basidiomycota)

open access: yesUkrainian Botanical Journal
Laricifomes officinalis is known for producing biologically active pharmaceuticals. This species belongs to wood-decay fungi capable of biotransforming various xenobiotics. Despite this potential, the ability of L.
Bondaruk S.V.   +2 more
doaj   +1 more source

Symmetrical and unsymmetrical α,ω-nucleobase amide-conjugated systems

open access: yesBeilstein Journal of Organic Chemistry, 2010
We present the synthesis and selected physicochemical properties of several novel symmetrical and unsymmetrical α,ω-nucleobase mono- and bis-amide conjugated systems containing aliphatic, aromatic or saccharidic linkages. The final stage of the synthesis
Sławomir Boncel   +4 more
doaj   +1 more source

amides

open access: yes, 2008
Citation: 'amides' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.A00266 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Macrocyclic Aromatic Oligoamides with Diphenyladamantane Units: Conformational Change from Folded to Open by N-Alkyl Removal

open access: yesMolecules
Macrocyclic aromatic amide oligomers of various sizes containing tertiary amides and diphenyladamantane moieties were synthesized by condensation reactions using PhP3Cl2 or LiHMDS.
Sae Maeda   +6 more
doaj   +1 more source

Low antiplasmodial activity of alkaloids and amides from the stem bark of Zanthoxylum rubescens (Rutaceae)

open access: yesParasite, 2007
The stem bark of Zanthoxylum rubescens (syn. Fagara rubescens) is used for treating fevers associated with malaria in the Ivory Coast. Three alkaloids: N-nornitidine, 7,9-dimethoxy-2,3- methylenedioxybenzophenanthridine, and bis[6-(5,6 ...
Penali L.   +4 more
doaj   +1 more source

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