Results 41 to 50 of about 194,755 (364)

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

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

n-Aldehydes ( C 6 - C 10 ) in snow samples collected at the high alpine research station Jungfraujoch during CLACE 5

open access: yes, 2009
Samples of freshly fallen snow were collected at the high alpine research station Jungfraujoch, Switzerland, during the Cloud and Aerosol Characterization Experiments (CLACE) 5 in February and March 2006.
Starokozhev, Elena   +4 more
core   +1 more source

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

Chromatographic methods and sample pretreatment techniques for aldehydes determination in biological, food, and environmental samples

open access: yes, 2019
Aldehydes are very reactive carbonyl compounds that are widespread naturally. Aldehydes can be produced in vivo by oxidative reactions and are able to disturb biological functions through binding and modifying biomolecules.
Kuroda, Naotaka   +2 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  

One-pot synthesis of 1,3,5-triazine-2,4-dithione derivatives via three-component reactions

open access: yesBeilstein Journal of Organic Chemistry, 2020
A catalyst-free one-pot synthetic methodology was developed for the preparation of 1,3,5-triazine-2,4-dithione derivatives through three-component reactions of arylaldehydes, thiourea, and orthoformates.
Gui-Feng Kang, Gang Zhang
doaj   +1 more source

Branched chain aldehydes: production and breakdown pathways and relevance for flavour in foods

open access: yes, 2009
Branched aldehydes, such as 2-methyl propanal and 2- and 3-methyl butanal, are important flavour compounds in many food products, both fermented and non-fermented (heat-treated) products. The production and degradation of these aldehydes from amino acids
Engels, W.J.M., Smit, B.A., Smit, G.
core   +1 more source

Tandem Triphosgene-Assisted Metal-Free One-pot Preparation of Nitriles and Amides from Aldehydes and Ketones

open access: yes, 2021
Here we report a facile and efficient triphosgene-assisted one-pot conversion of aldehydes/ketones into nitriles/amides. The triphosgene, a kind of phosgene alternative, containing both ester linkage and chloromethyl units, easily reacts with oximes for ...
Jianguo, liu, Xiu-Zhi, Wei, Longlong, Ma
core   +1 more source

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