Results 41 to 50 of about 455,540 (404)

Vertical distribution of aldehydes and phytoplankton structure: a case study of urban lake [PDF]

open access: yesArchives of Environmental Protection, 2020
In water systems, both biologically and chemically synthesized molecules may reduce environmental quality and influence essential ecosystems structure and function.
Elżbieta Szeląg-Wasielewska   +1 more
doaj   +1 more source

Reactivity of TEMPO anion as a nucleophile and its applications for selective transformations of haloalkanes or acyl halides to aldehydes [PDF]

open access: yes, 2004
Sodium 2,2,6,6-tetramethylpiperidine-N-oxide (TEMPO−Na+), generated by reduction of TEMPO· with sodium naphthalenide in THF, reacted with alkyl halides or acyl halides to produce O-alkylated or acylated TEMPOs, which were in turn oxidized with ...
Allen   +35 more
core   +1 more source

Study of the influence of fermentation conditions on the content of aroma-forming substances in young red wines

open access: yesНовые технологии, 2023
One of the main requirements for young wines is preservation the qualities of the grapes, including the bright varietal aroma characteristic of essential oils concentrated in the grape skins.
L. V. Gnetko   +3 more
doaj   +1 more source

Effect of torrefaction pretreatment on the pyrolysis of rubber wood sawdust analyzed by Py-GC/MS [PDF]

open access: yes, 2018
The aim of this study was to investigate the effect of torrefaction on the pyrolysis of rubber wood sawdust (RWS) using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS).
Chen, Wei-Hsin   +4 more
core   +1 more source

Reactions of Soy Flour and Soy Protein by Non-Volatile Aldehydes Generation by Specific Oxidation

open access: yesPolymers, 2019
Soy protein isolate (SPI) and insoluble soy flour polymeric carbohydrates have been reacted with sodium periodate for the specific oxidation of vicinal –OH groups to investigate the reactions involved in this approach to soy flour adhesives.
C. Frihart   +3 more
semanticscholar   +1 more source

Synthesis and Biological Evaluation of Hydrazone Derivatives as Antifungal Agents

open access: yesMolecules, 2015
Emerging yeasts are among the most prevalent causes of systemic infections with high mortality rates and there is an urgent need to develop specific, effective and non-toxic antifungal agents to respond to this issue.
Bruna B. Casanova   +7 more
doaj   +1 more source

Enantioselective Organocatalyzed Michael Addition of Isobutyraldehyde to Maleimides in Aqueous Media

open access: yesMolecules, 2022
Thiourea was introduced into (R,R)-1,2-diphenylethylenediamine as an organocatalyst to promote the reaction between isobutyraldehydes and maleimides. Enantioselective Michael addition reaction was carried out as an eco-friendly method using water as the ...
Jae Ho Shim   +3 more
doaj   +1 more source

Synthesis and use of a stable aminal derived from TsDPEN in asymmetric organocatalysis [PDF]

open access: yes, 2010
A stable aminal formed stereoselectively from (R,R)-N-tosyl-1,2-diphenyl-1,2-ethylenediamine (TsDPEN) is capable of asymmetric organocatalysis of Diels-Alder and alpha-amination reactions of ...
Clarkson, Guy J.   +3 more
core   +1 more source

An environmentally benign one-pot synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-one derivatives catalysed by phosphomolybdic acid [PDF]

open access: yesJournal of the Serbian Chemical Society, 2011
A phosphomolybdic acid catalysed novel method for the synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-one derivatives by a one-pot, three-component reaction of β-naphthol, aromatic aldehydes and urea in excellent yields is described.
ATUL CHASKAR   +4 more
doaj  

Highly Diastereo- and Enantioselective Allylboration of Aldehydes using alpha-Substituted Allyl/Crotyl Pinacol Boronic Esters via in Situ Generated Borinic Esters [PDF]

open access: yes, 2013
Readily available, alpha-substituted allyl/crotyl pinacol boronic esters often give low E/Z selectivity (with Z favored) in reactions with aldehydes. We found that addition of nBuLi to the pinacol boronic ester followed by trapping of the alkoxide with ...
Althaus M.   +60 more
core   +2 more sources

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