Context: Organomagnesiates are bimetallic complexes that result in combining a “polar” (e.g. an organolithium) with a “soft” organometallic (e.g. organomagnesium), which behaviour is significantly different from those of the precursor. The principle is a synergy created by mixing two different organometallic reagents allowing increased selectivity and reactivity. Indeed, those reagents tolerate easier a bromine or ester function for example. They can as well be used under non-cryogenic conditions compared to the monometallic reagent. Moreover, those heterobimetallic reagents are from cheap and abundant metals which are the key towards the development of sustainable chemical processes. Combined with a chiral ligand, they also can be very powerful to induce enantioselectivity. In the last few years, we developed and studied (chirales) organomagnesiates complexes as metal-halogen agent for the synthesis of diversely (chirales) 3-substitued and 3,3’-disubstitued (aza)phthalides.
Research objectives: The aim of this project is to use organobimetallic complexes’ properties to develop an original straightforward way to access to (chiral) alkyl and (hetero)aromatic boronic ester using a specific key boron reagent, iPrBHCl.
Faculté des Sciences et Technologies
Campus Aiguillettes, entrée 5A, 5ème étage - BP 70239
54506 Vandoeuvre-lès-Nancy, France
Topic : Biomass valorisation is an important topic to mitigate climate change. Biofuels and green chemicals can be produced from lignocellulosic biomass such as wood. Lignin is the second most abundant macromolecule on earth (after cellulose). Thus, the lignin refining could produce aromatic compounds which are important building blocks currently obtained from crude oil. But, according to literature, the challenge remains in the develop of stable and selective catalysts to desoxygenate lignin. The goal of the M2 project, is to pursue the development of low cost, not toxic and selective catalysts free of noble metals such as iron, copper, nickel and cobalt. Here, metal supported catalysts will be synthesized from metallo-surfactant templating. This route, investigated in our laboratory, affords to prepare porous silica catalysts with well dispersed nanometric metallic clusters in the silica walls. Moreover, the combination of two different metallo-surfactants for the synthesis of the silica porous catalyst will be studied to aim the enhancement of the catalytic activity in the deoxygenation reaction (heterogeneous catalysis). After synthesis, the catalysts will be characterized in terms of texture, morphology, and metals content.
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We offer an 18-months postdoctoral position to work on the photophysical mechanism of molecular motors (or more generally photoswitches). You will be responsible and/or participate to the following tasks: • Study of the ground state structure and dynamics at molecular and assembled levels • Characterization of excited-state dynamics at molecular and assembled level • Participation in the supervision of PhDs, engineers, and trainees - restoring the results, communication at international conferences, participation in writing of manuscripts.
Keywords: ultrafast spectroscopy • self-assembling • photoswitches • molecular machines