Organic Syntheses

DFMPM is prepared from cardanol using standard methods. The Schiff base complexes Zr(IV) and Th(IV) of di -formyl methoxy bis(3-pentadecenylphenyl)methane (DFMPM) and p-toluidine were synthesized and characterized by elemental analysis, conductivity measurements, electronic, infrared, spectral measurements, metal ion intake and antibacterial studies. The conductance measurements indicate that all the complexes are non-electrolytes. The results indicate that the metal complexes of Zr(IV) and Th(IV) are octa-coordinated and have moderate antibacterial activity and also used for the removal of such ions from water.

Cet article vise a mettre a l'epreuve la notion de " ressource territoriale " ou " actif specifique " pour comprendre et analyser l'emergence d'une action collective. Elle a pour objectif de reveiller une production locale trop longtemps endormie et lui faire jouer un role de " dynamisatrice " territoriale. Il s'agit de la production de quinoa dans la zone du " Secano Costero " de la VIeme region du Chili (Region del Libertador Bernardo O'Higgns). Sa culture est essentiellement pratiquee par les petits producteurs familiaux, sur des sols plutot pauvres ou degrades et destinee majoritairement, voire essentiellement, a la consommation familiale et locale. Cependant avec l'envolee recente de la demande internationale, et nationale, elle pourrait devenir une " speculation " rentable pour ces petits producteurs et servir de levier a une dynamique territoriale associant agriculture et tourisme, en particulier le tou...

A mild and easy to perform multicomponent coupling involving phosphines, arynes generated from 2‐(trimethylsilyl)aryl triflates, and CO2 allowing the transition‐metal‐free synthesis of zwitterionic phosphonium benzoates has been developed. The reaction proceeds via the generation of 1 : 1 zwitterionic intermediates from phosphines and arynes followed by the interception with CO2 to deliver the carboxylates in moderate to good yields instead of the anticipated benzooxaphosphol‐3(1H)‐ones.

Arynes are a unique class of intermediates used in synthetic organic chemistry, and research interest has been intensely focused on their peculiar reactivities. Arynes have been researched for almost a century. However, difficulties in monitoring these reactive species, as well as difficulties in creating synthetically viable techniques for their synthesis and trapping, have restricted their application. A key tactic for achieving the racemic and enantiopure total synthesis of a broad variety of natural compounds or their structural derivatives. The chemistry of arynes has advanced significantly over the past thirty years, particularly in the field of transition metal carbon-carbon and carbon-heteroatom bond-forming mechanisms. The field's fast growth is largely attributable to the development of mild aryne production processes. To create a natural product with complex organic molecules, the role of aryne intermediates was non-replaceable. These organic substances are often used in medicine, therapies, or as raw material for the synthesis of other substances. Moreover, they may perform important biological tasks. There are numerous methods for synthesizing natural compounds including total synthesis, semi-synthesis, and biosynthesis. Total synthesis is the process of creating natural products entirely chemically from basic precursors as well as it can be produced in large quantities and can reveal information about its biological activity. One of the developments in Arynes' chemistry is the chemical rearrangements brought about by this electrophilic intermediate. It is not feasible to use conventional methods in a single step. This review article discusses how arynes are used to create natural products. Arynes has a wide range of functionality in the field of scientific research. The evolution of this method has made a tremendous change in the total synthesis of natural products. Benzynes enabled creative synthesis in mild conditions. The transformation has expanded to investigate various reaction classes such as nucleophilic addition, (4+2), and (2+2) cycloaddition strategies and metal-catalyzed reactions are shown and explained in this article. This review will provide an idea about how the arynes act as an intermediate in those reaction mechanisms and enlighten the scope of these aryne intermediate. I.

L’idee que l’innovation ou la creativite pourraient etre a l’origine des processus de developpement des territoires est apparue assez recemment dans la litterature, ainsi que dans les politiques et actions publiques. Ce n’est que ces dernieres annees que s’est impose le fait que les activites nouvelles pouvaient presenter un interet, voire meme constituer le moteur de la croissance des territoires. Cet article a pour objet d’explorer le lien entre trois elements essentiels : l’innovation, le developpement territorial et la gouvernance. Dans une premiere partie, nous presentons les principaux modeles de developpement et leurs declinaisons dans les territoires ruraux ou agricoles. Nous abordons ensuite la question de la place de l’innovation dans les approches du developpement, en considerant successivement les approches de l’innovation territorialisee et les politiques territoriales d’innovation. Nous terminons enfin par l’analyse des modes de gouvernance des espaces ruraux et periur...