Results 11 to 20 of about 161,569 (262)

Compostos carbonílicos atmosféricos: fontes, reatividade, níveis de concentração e efeitos toxicológicos Atmospheric carbonyl compounds: sources, reactivity, concentration levels and toxicologic effects

open access: yesQuímica Nova, 2002
In the last three decades carbonyl compounds, aldehydes and ketones, have received a great deal of attention due to their strong influence on photochemical smog formation and their recognized adverse human health effects.
Marta Valéria Almeida Santana de Andrade   +3 more
doaj   +1 more source

Microfluidic Preconcentration Chip with Self-Assembled Chemical Modified Surface for Trace Carbonyl Compounds Detection

open access: yesSensors, 2018
Carbonyl compounds in water sources are typical characteristic pollutants, which are important indicators in the health risk assessment of water quality.
Jie Cheng   +6 more
doaj   +1 more source

Reduction of Carbonyl Compounds with (±)-2-Trimethylsilyl-2,3-dicarba-nido-hexaborane(8)

open access: yesCHIMIA, 1986
The racemic nido-carbaborane 1 reduces aldehydes and ketones but not styrene after addition of small amounts of water.
Urs von Arx   +2 more
doaj   +1 more source

Visible-light photoredox-catalyzed umpolung carboxylation of carbonyl compounds with CO2

open access: yesNature Communications, 2021
Compounds bearing a carbonyl group, such as aldehydes and ketones, are important industrial chemicals and widespread in pharmaceuticals and natural products.
Guang-Mei Cao   +7 more
doaj   +1 more source

Fe(OTf)3-catalysed Friedel–Crafts reaction of benzenoid arenes with α,β-unsaturated carbonyl compounds: easy access to 1,1-diarylalkanes [PDF]

open access: yesRoyal Society Open Science, 2017
A simple and efficient method for the synthesis of 1,1-diarylalkanes via the Friedel–Crafts-type alkylation reaction of electron-rich arenes with cinnamic acid ester derivatives or chalcones is reported.
Aditya Bhattacharya   +2 more
doaj   +1 more source

Electrochemically driven desaturation of carbonyl compounds [PDF]

open access: yesNature Chemistry, 2020
Electrochemical techniques have long been heralded for their innate sustainability as efficient methods for achieving redox reactions. Carbonyl desaturation, as a fundamental organic oxidation, is an oft-employed transformation to unlock adjacent reactivity. To date, the most reliable methods for achieving it have relied on transition metals (Pd/Cu) or
Samer Gnaim   +8 more
openaire   +2 more sources

Phosphoranaloga von Aminosäuren und Peptiden: Kettenverlängerung von Carbonylverbindungen

open access: yesCHIMIA, 1982
Synthesis of carbonyl compounds 5 involving the Wittig-Horner reaction of diethyl-1-isocyanoalkylphosphonate 1 with carbonyl compounds 2 and subsequent hydrolysis of the vinyl isocyanides 3 formed is reported.
Janusz Rachoń
doaj   +1 more source

Selective oxidation of some primary and secondary benzylic alcohols to the corresponding carbonyl compounds with a Cu(III) complex [PDF]

open access: yesJournal of the Serbian Chemical Society, 2005
The selective oxidation of benzylic alcohols to the corresponding carbonyl compounds is described. In alkaline solution, the oxidation reagent potassium tetrasodium diperiodatocuprate(III) dodecahydrate (KNa4[Cu(HIO6)2[12H2O] reacts with primary and ...
Bugarčić Zorica M.   +2 more
doaj   +3 more sources

Reactive carbonyl compounds related uremic toxicity (“carbonyl stress”)

open access: yesKidney International, 2001
Many studies on uremic toxins have focused on enzymatic biochemistry. Recently, attention has turned to nonenzymatic biochemistry, especially progressive and irreversible modifications of proteins. Two different approaches opened the field of irreversible nonenzymatic modifications of proteins in uremia: the advanced glycation end products (AGEs ...
Miyata, Toshio   +3 more
openaire   +2 more sources

Analytical Methods for Atmospheric Carbonyl Compounds: A Review

open access: yesAtmosphere
Atmospheric carbonyl compounds have significant impacts on the atmospheric environment and human health, making the selection of appropriate analytical techniques crucial for accurately detecting these compounds in specific environments.
Xiaoshuai Gao   +10 more
doaj   +1 more source

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