Search results for "Alcohol"

Imidazolium and Potassium Hydrogen Carbonate Salts as Ecofriendly Organocatalysts for Oxazolidinone Synthesis

2016

International audience; Although oxazolidinones are valuable intermediate compounds for industrial applications, no synthetic method is suitable for their production on a large scale owing to the use of reagents/catalysts that are hazardous or toxic to human health or ecotoxic for the environment. In this manuscript, we describe new and efficient catalysts, that is, the nontoxic hydrogen carbonate anion in combination with a potassium or diisobutylimidazolium ([iBu(2)IM]) countercation, for the conversion of -amino alcohols into cyclic oxazolidinones in high yields of 69 to 90%. Depending on the catalytic conditions, both catalysts could be easily recovered from the crude reaction products …

New approach for synthesis of poly(ethylglyoxylate) using Maghnite-H + , an Algerian proton exchanged montmorillonite clay, as an eco-catalyst

2017

International audience; In this works, we have explored a new method for a green synthesis of poly(ethylglyoxylate) (PEtG). This method consists on using a montmorillonite clay called Maghnite-H+ as an eco-catalyst to replace triethylamine which is toxic. Cationic polymerization experiments are performed in bulk conditions at three temperatures (-40 degrees C, 25 degrees C, 80 degrees C) and in THF solutions at room temperature (25 degrees C). At 25 degrees C, an optimum ratio of 5 wt% of catalyst leads to molar masses up to 22000 g/mol in THF solutions. Polymerizations in bulk conditions lead to slightly lower masses than experiments conducted in THF solutions. However, bulk polymerization…

Structural insight on organosilica electrodes for waste-free alcohol oxidations

2007

Organic modification of sol-gel catalytic glassy electrodes made of a thin layer of organosilica doped with nitroxyl radical TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) crucially enhances stability in the waste-free oxidation of alcohols to carbonyls in water. Structural comparison between analogous films made of organosilica and unmodified SiO2 shows that the origin of the pronounced stable activity of the ORMOSIL film lies in high hydrophobic and also in the pronounced low degree of hydrophilicity.

β-arrestin: Dr Jekyll and Mr Hyde in NASH and fibrosis.

2020

tert-Butoxyl radicals generate mainly 7,8-dihydro-8-oxoguanine in DNA.

2000

Abstract Like hydroxyl radicals, alkoxyl radicals have been implicated in the generation of cellular oxidative DNA damage under physiological conditions; however, their genotoxic potential has not yet been established. We have analyzed the DNA damage induced by a photochemical source of tert- butoxyl radicals, the water soluble peroxy ester [4-( tert -butyldioxycarbonyl)benzyl]triethylammonium chloride (BCBT), using various repair endonucleases as probes. The irradiation (UV 360 ) of BCBT in the presence of bacteriophage PM2 DNA was found to generate a DNA damage profile that consisted mostly of base modifications sensitive to the repair endonuclease Fpg protein. Approximately 90% of the mo…

Spermiogrammbefunde bei männlichen Patienten nach Alkoholdelir

2009

Zusammenfassung Bei 30 Patienten mit alkoholtoxischem Delir wurden die wichtigsten Spermiogramm-Parameter untersucht: Es wurden bei verminderter Spermatozoendichte von im Mittel 18 Mill.Sp./ml gehauft eine Hypospermie (n = 8) beobachtet. Beurteilt man Spermatozoendichte, Morphologie und Motilitat, so erweisen sich 29 der 30 Untersuchten Spermiogramme als stark pathologisch verandert. Die Spermiogenese-Storung ist bei erhohter FSH-Basiswerten (n = 10) und bei akuter alkoholtoxischer Hepatitis (n = 4) am ausgepragtesten (2a = 0.01), hangt dagegen weniger vom Trinkerstadium nach Jellinek, erhohten Ostradiol-Werten (n = 6) oder erhohten CK-Werten (n = 8) ab. Bei Alkoholkranken bei offensichtlic…

Relation between current alcohol consumption and attitude towards alcohol use among students

2020

Motivation for participation in rehab therapy and stress-coping styles in alcohol dependent women and men

2020

Use of sequentially inoculation of Saccharomyces cerevisiae and Hanseniaspora uvarum strains isolated from honey by-products to improve and stabilize…

2022

Mead is a beverage produced by alcoholic fermentation of honey-must. The starter yeasts that are commonly used for the alcoholic fermentation of honey-must are oenological Saccharomyces cerevisiae strains. The objective of the present work was, for the first time, to apply yeasts of honey by-products origin to evaluate the influences the taste-olfactory attributes of mead. For this purpose, three experimental productions were set up, which included: (i) single inoculation of S. cerevisiae; (ii) single inoculation of Hanseniaspora uvarum; (iii) sequential inoculation of H. uvarum/S. cerevisiae. Two control trials were performed, using a commercial strain of S. cerevisiae of oenological origi…

Parental Monitoring and Youth's Binge Behaviors: The Role of Sensation Seeking and Life Satisfaction

2019

Framed within an ecological perspective of the onset of adolescent problem behaviors, the current study explored the joint role of parent-adolescents’ relationships and youth's individual factors in binge eating and drinking. Firstly, in line with pieces of research highlighting the beneficial impact of effective parenting on youth development, the present paper sought to enhance the knowledge about the positive influence of parental monitoring on youth's binge drinking and eating. Moreover, since literature evidenced that the explanatory mechanisms of the association between parental monitoring and binge behaviors are not fully explored, the study focused on the potential intervening role …