École nationale supérieure de chimie de Lille

About: École nationale supérieure de chimie de Lille is a facility organization based out in Villeneuve-d'Ascq, France. It is known for research contribution in the topics: Catalysis & Intumescent. The organization has 464 authors who have published 634 publications receiving 21882 citations. The organization is also known as: Ecole nationale supérieure de chimie de Lille & Ecole nationale superieure de chimie de Lille.

Catalytic Synthesis and Asymmetric Reduction of Pyridylglyoxylic Amides and Esters

Abstract: The preparation of 2-pyridyl- and 4-pyridylglyoxylic esters and amides in moderate to high yields via palladium-catalyzed double carbonylation of 2-iodo- and 4-iodopyridines is reported. The effect of temperature, CO pressure, solvent, nature and concentration of nucleophile, nature of catalyst precursor, and substituents on iodopyridines has been investigated. The reduction of 4-pyridylglyoxylate esters into the corresponding α-hydroxy esters via ruthenium-catalyzed asymmetric hydrogenation or using alpine-borane proceeded in high yields but poor enantioselectivity. The results for the carbonylation and the hydrogenation catalytic processes are discussed in terms of electronic effects induced by the pyridyl ring.

Cerium (IV) ammonium nitrate as an efficient catalyst for oxidation of alkyl malonates into ketomalonates by dioxygen

Abstract: The synthesis of diethyl ketomalonate via direct oxidation of diethyl malonate by pure oxygen or even using air, in the presence of cerium ammonium nitrate (CAN) used in catalytic amount is reported. The efficiency of this new catalytic system toward this reaction is compared to the previously described CoIII-MnIII catalyst. Thus, when (NH4)2Ce(NO3)6 was used, oxidation occurred in acetic acid-acetonitrile medium ( 1 1 v/v) under oxygen flow at moderate temperature (50–70°C) and with excellent selectivity (> 90%). In contrast, the Co Mn catalyst required higher temperature (80–120°C) and the selectivity for the desired product drastically decreased with conversion. Under the latter conditions, a great part of the reaction products and/or substrate is degraded into CO2 and H2O. Moreover, with CAN system, an appreciable yield could be obtained under air flow (or even only by stirring under air) whilst with Co Mn , under the same conditions, the conversion was very low. Finally the separation of CAN from reaction products and solvents at the end of the reaction and its reuse could be facilitated by coating CAN on porous silica. This supported CAN SiO 2 system exhibited in its first use the same activity as free CAN and in its second use about 70% of the initial value.

Comparative study of the texture and structure of aerogel and xerogel sulphated zirconia doped with nickel

Abstract: Aerogels and xerogels based on sulphated zirconia doped with nickel in the same atomic ratios S/Zr = 0.5 and Ni/Zr = 0.1 have been synthesized by sol–gel method using two drying ways of the solvent in solid preparation steps. Aerogels obtained by drying in supercritical conditions of solvent stabilize zirconia tetragonal phase even at high calcination temperatures and present a developed surface area, whereas xerogels obtained by ordinary solvent drying in an oven are amorphous. TPR and XPS studies revealed that Ni seems to exist in different species in the two kinds of solids and it is more reducible in aerogels.

Influence of Apparent Density during the Burning of Wood Waste Furniture

Abstract: In the near future, in France, new regulations will govern the emissions of gaseous effluents. The furniture industry will be affected. Different wood wastes, from furniture, were burnt in an open cone calorimeter. Several configurations of wood (whole-wood and shredded wood samples) were studied: wood chips, wood fibers, and boards. The efficiency of combustion appears to be well correlated with the apparent density of these materials. Temperature evolution was followed during the combustion of these materials. The temperature histories show that increasing the apparent density of compounds strongly improves the heat transfer into the materials. The maximum rate of heat release (HRR) increased with increasing apparent density. Moreover, gases in the exhaust were analyzed. The combustion becomes complete when waste was compressed to obtain boards. For example, carbon monoxide emissions from wood boards were 45% less than from wood fibers.

A Well-Defined Silica-Supported Lanthanum Bis(phosphinimino)methanide

Abstract: Grafting of the bis(phosphinimino)methanide complex [La{CH(PPh2NSiMe3)2}{N(SiHMe2)2}2] (1) onto dehydroxylated silica (SiO2-700) affords material 2. Full characterization of this material by infrared spectroscopy, elemental analysis, and multinuclear, multidimensional solid-state NMR spectroscopy showed formation of well-defined bis(phosphinimino)methanide amido surface species, [(≡SiO)La{CH(PPh2NSiMe3)2}{N(SiHMe2)2}], along with [≡SiOSiHMe2] sites.