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251 results on '"Jean-Marc Vincent"'

1. Cyclic Carbonates through the Photo-Induced Carboxylative Cyclization of Allylic Alcohol with CO2: A Comprehensive Kinetic Study of the Reaction Mechanism by In Situ ATR-IR Spectroscopy

Author

Joseph Grondin, Christian Aupetit, Jean-Marc Vincent, and Thierry Tassaing

Subjects
CO2 organocatalysis, photo-promoted ATRA, cyclic carbonates, Chemical technology, TP1-1185, Chemistry, QD1-999
Abstract

A one-pot multicomponent green process is investigated for the synthesis of perfluoroalkylated cyclic carbonate which merges the photo-promoted Atom Transfer Radical Addition (ATRA) of a perfluoroalkyl iodide (Rf-I) onto allyl alcohols with the Lewis-base-promoted carboxylative cyclization. The evolution of the complex mixture during the reaction was monitored by in situ ATR-IR and Raman spectroscopies that provided insights into the reaction mechanism. The effect on the kinetics and the carbonate yields of key parameters such as the stoichiometry of reagents, the nature of the Lewis base and the solvent, the temperature and the pressure were evaluated. It was found that high yields were obtained using strong Lewis bases that played both the role of activating the allyl alcohol for the generation of the allyl carbonate in the presence of CO2 and promoting the ATRA reaction through the activation of C4F9I by halogen bonding. This protocol was also extended to various unsaturated alcohols.

Published
2023
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2. Effective ascorbate-free and photolatent click reactions in water using a photoreducible copper(II)-ethylenediamine precatalyst

Author

Redouane Beniazza, Natalia Bayo, Florian Molton, Carole Duboc, Stéphane Massip, Nathan McClenaghan, Dominique Lastécouères, and Jean-Marc Vincent

Subjects
benzophenone photosensitizer, bioconjugation, click chemistry, copper, photoreduction, Science, Organic chemistry, QD241-441
Abstract

The search for copper catalysts able to perform effectively click reactions in water in the absence of sodium ascorbate is an active area of current research with strong potential for applications in bioconjugation. The water-soluble and photoreducible copper(II)–EDA (EDA = ethylenediamine) complex 1, which has two 4-benzoylbenzoates acting as both counterion and photosensitizer, has been synthesized and characterized by different techniques including single crystal X-ray diffraction. Highly efficient photoreduction was demonstrated when solutions of 1 in hydrogen atom donating solvents, such as THF or MeOH, were exposed to UVA radiation (350–400 nm) provided by a low pressure mercury lamp (type TLC = thin-layer chromatography, 365 nm), or by a 23 W fluorescent bulb, or by ambient/sunlight. In water, a much poorer hydrogen atom donating solvent, the photoreduction of 1 proved inefficient. Interestingly, EPR studies revealed that complex 1 could nonetheless be effectively photoreduced in water when alkynes were present in solution. The catalytic activity of 1 for click reactions involving a range of water-soluble alkynes and azides, in particular saccharides, was tested under various illumination conditions. Complex 1 was found to exhibit a photolatent character, the photogenerated copper(I) being very reactive. On irradiating aqueous reaction mixtures containing 1 mol % of 1 at 365 nm (TLC lamp) for 1 h, click reactions were shown to proceed to full conversion.

Published
2015
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3. Approche poissonnienne des modèles d’interaction spatiale

Author

G. D’Aubigny, Christian Calzada, Claude Grasland, D. Robert, G. Viho, and Jean-Marc Vincent

Subjects
Poisson distribution, freight flows, likelihood, overdispersion, spatial interaction, Geography (General), G1-922
Abstract

This paper deals with specification, estimation and tests of the models based on count data, especially the Poisson regression analysis of spatial flows. Beginning with Poisson models, which involve strong assumptions, a variety of stochastic models and their applications are discussed.

Published
2000
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18. [2]Rotaxanes featuring minimal helical axles

Author

Jorge Meijide Suárez, Vicente Martí-Centelles, Arnaud Tron, Thierry Buffeteau, Stéphane Massip, Céline Olivier, Isabelle Pianet, Cybille Rossy, Jean-Marc Vincent, and Nathan McClenaghan

Abstract

α,ω-Stoppered perfluorous domains act as rigid and chiral linear helical elements in rotaxane constructs. Dynamic NMR shows modified ring dynamics over 4–orders of magnitude compared to hydrocarbon analogues, while vibrational-CD shows stopper-induced preferential axle chirality.

Published
2023

49. F 3 ARIoT: A Framework for Autonomic Resilience of IoT Applications in the Fog

Author

François-Gaël Ottogalli, Umar Ozeer, Loic Letondeur, Gwen Salaün, Jean-Marc Vincent, Orange Labs [Meylan], Orange Labs, Construction of verified concurrent systems (CONVECS ), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire d'Informatique de Grenoble (LIG), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Performance analysis and optimization of LARge Infrastructures and Systems (POLARIS)

Subjects
Information privacy, Computer science, Distributed computing, Internet of Things, Fault Tolerance, 02 engineering and technology, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], Consistency (database systems), Artificial Intelligence, Home automation, Hazardous waste, 020204 information systems, Management of Technology and Innovation, 0202 electrical engineering, electronic engineering, information engineering, Computer Science (miscellaneous), [INFO.INFO-SY]Computer Science [cs]/Systems and Control [cs.SY], Overhead (computing), Resilience (network), Engineering (miscellaneous), Consistent Recovery, Resilience, business.industry, Computer Science Applications, [INFO.INFO-PF]Computer Science [cs]/Performance [cs.PF], Hardware and Architecture, Fog computing, 020201 artificial intelligence & image processing, Enhanced Data Rates for GSM Evolution, business, Software, Information Systems
Abstract

International audience; Fog Computing is especially appealing to the Internet of Things (IoT) because it provides computing, storage, and communication resources at the edge of the network, near the physical world (PW). Thus, IoT located in the PW can have interesting properties such as low latencies, real-time operations , and data privacy. The Fog, however, is unstable because it is constituted of billions of devices in a dynamic environment. Moreover, the Fog is cyber-physical and devices are thus subjected to external PW conditions which increase the occurrence of failures. When failures occur in such an environment, the resulting consequences on the PW can be hazardous and costly. This paper presents F3ARIoT, a framework for autonomic resilience of IoT applications in the Fog. This framework recovers from failures as well as maintains consistency and safety with respect to the PW during the recovery procedure. F3ARIoT was implemented and evaluated on a smart home application. A performance evaluation showed that it has a negligible overhead and recovers from failures in a very short delay with respect to end-users.

Published
2020

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