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Tazi S.,Laboratoire des Materiaux et Systemes Interfaciaux | Raissouni I.,Laboratoire des Materiaux et Systemes Interfaciaux | Chaoukat F.,Laboratoire des Materiaux et Systemes Interfaciaux | Bouchta D.,Laboratoire des Materiaux et Systemes Interfaciaux | And 3 more authors.
Journal of Materials and Environmental Science | Year: 2016

In recent decades, Natural substances were intensively studied in order to determine their active compounds that have found its application in food and medical-sciences. The growing interest in such substances diversifies its applications including as anti-corrosion substances. Indeed, interesting results were obtained with essential oils as materials protection for metals, beside these natural inhibiters were recognized as not toxic elements and therefore do not present risks for environmental pollution compared to the organic inhibiters. In this work, we studied the effect of essential oil of clove (recognized in medical field by its analgesic and antiseptic properties) on the corrosion of brass (70%Cu/30%Zn) in NaCl 3%. The results obtained showed a improvement of alloy resistance against salt corrosion. In order to determine the most active component of this essential oil, that plays a key role in inhibiting corrosion of this alloy, the eugenol was extracted from the essential oil of clove. The effect of concentration, temperature and the immersion time were studied to measure the inhibiting capacity of eugenol by using polarization and electrochemical impedance spectroscopy (EIS). Source

Youssef C.,University of Sfax | Ammar H.B.,University of Sfax | Ammar H.B.,Laboratoire Of Chimie Organique Appliquee | Belhouchet M.,University of Sfax | And 4 more authors.
Journal of Heterocyclic Chemistry | Year: 2011

2-(Arylidene)cyanomethylbenzoxazoles have been prepared in water from benzoxazole-2-ylacetonitriles. Using multi-component reactions, a variety of heterocycles containing benzoxazole and nitrile functionality has been prepared. © 2011 HeteroCorporation. Source

Ammar H.B.,Laboratoire Of Chimie Organique Appliquee | Hassine B.B.,University of Monastir | Fischmeister C.,CNRS Chemistry Institute of Rennes | Dixneuf P.H.,CNRS Chemistry Institute of Rennes | Bruneau C.,CNRS Chemistry Institute of Rennes
European Journal of Inorganic Chemistry | Year: 2010

Imidazolium-oxazoline chlorides have been prepared from chloroacetonitrile and used to generate bidentate mixed NHC-oxazoline ligands for ruthenium-catalyzed substitution of cinnamyl chloride by phenols. These ligands associated to [RuCp*(MeCN)3][PF6] promote allylic substitution reactions at room temperature with high regioselectivity in favour of the branched isomers giving terminal alkenes. These allylic ethers have been involved in further ruthenium-catalyzed cross metathesis reactions with electron-deficient olefins to give unsaturated esters and aldehydes. NHC-oxazoline ligands associated to the Cp*RuII moiety generate catalysts that orientate the nucleophilic allylic substitution of cinnamyl chloride by phenols towards the regioselective formation of branched products, which, on reaction with Hoveyda(II) catalyst, lead to cross metathesis, and unsaturated functional compounds. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Ben Ammar H.,Laboratoire Of Chimie Organique Appliquee | Ben Ammar H.,CNRS Chemistry Institute of Rennes | Miao X.,CNRS Chemistry Institute of Rennes | Fischmeister C.,CNRS Chemistry Institute of Rennes | And 2 more authors.
Organometallics | Year: 2010

The reaction of [RuCl 2(p-cymene)] 2 with benzoxazoleacetonitriles and NH 4 +BF 4 - in methanol leads to bidentate N,N′-benzoxazole-methoxyimine- ruthenium(II) complexes 7, corresponding to the addition of methanol to the ruthenium(II)-activated nitrile triple bond. The X-ray structure of a complex 7 shows equivalent Ru-N and slightly different C=N bond distances. The catalytic hydration of benzoxazolacetonitriles with [RuCl 2(p-cymene)] 2 in methanol/water leads to quantitative formation of corresponding amides under mild conditions. © 2010 American Chemical Society. Source

Saffaj T.,University Sidi Mohammed Ben Abdellah | Saffaj T.,Laboratoire Of Chimie Organique Appliquee | Ihssane B.,Laboratoire Of Chimie Organique Appliquee
Talanta | Year: 2012

The aim of this paper is to apply a new technique for the validation of quantitative analytical procedures based on Bayesian simulation and accuracy profile. Also, an original strategy for estimating measurement uncertainty by the same approach has been developed. The performance of our proposal was confirmed by application to analytical and bio-analytical methods. Compared to the classical strategy, the new approach has a more holistic character. It means that it is no longer necessary to know the various individual steps into which the analytical method can be broken down since this latter is taken as a whole. Furthermore, the Bayesian accuracy profile procedure allows to control the risk associated with the future use of the analytical method. © 2011 Elsevier B.V. All rights reserved. Source

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