Green Metathesis Chemistry: Great Challenges in Synthesis, by Valerian Dragutan, Albert Demonceau, Ileana Dragutan, Eugene PDF

By Valerian Dragutan, Albert Demonceau, Ileana Dragutan, Eugene Sh. Finkelshtein

A very good overseas medical occasion within the box of metathesis chemistry, the NATO ASI "Green Metathesis Chemistry: nice demanding situations in Synthesis, Catalysis and Nanotechnology" has been lately equipped in Bucharest, Romania (July 21- August 2, 2008). a variety of popular scientists, younger researchers and scholars, convened for 2 weeks to provide and debate at the latest developments in alkene metathesis and determine destiny views during this attention-grabbing quarter of natural, organometallic, catalysis and polymer chemistry with foreseen vital purposes in fabrics technology and know-how. Following the fruitful perform of NATO complicated research Institutes, chosen contributions overlaying plenary lectures, brief communications and posters were compiled during this particular quantity devoted to this profitable conference on eco-friendly metathesis chemistry. common curiosity was once basically serious about correct "green chemistry" beneficial properties on the topic of all kinds of metathesis reactions (RCM, CM, enyne metathesis, ADMET and ROMP). different possibilities for eco-friendly and sustainable applied sciences and business strategies in line with metahesis were pointed out. mostly exemplified used to be the software of this generally acceptable procedure in natural synthesis, for gaining access to typical items and prescription drugs, and likewise its skill to slot in the manufacture of clever and nanostructured fabrics, self-assemblies with nanoscale morphologies, macromolecular engineering.

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Additional resources for Green Metathesis Chemistry: Great Challenges in Synthesis, Catalysis and Nanotechnology (NATO Science for Peace and Security Series A: Chemistry and Biology)

Example text

Alternatively, an approach inspired by a procedure described by Blechert et al. [13] proved successful. Unmasking of the appropriate imidazolinium hydrochloride salts using LiHMDS in presence of the Hoveyda catalyst upon stirring in chloroform enabled the introduction of the NHC ligand. Complexes bearing N,N′-dialkyl-heterocyclic carbenes were obtained by an analogous procedure (Figure 7). In order to depict the potential of the thus obtained complexes, their use as catalysts for ROMP of cis,cis-cycloocta-1,5-diene (4) and cross-metathesis of acrylonitrile (14) and allylbenzene (13) (Scheme 3) was elaborated.

P. ) at ambient temperature to form the corresponding Ru-allenylidene complexes 11 in excellent yields [12c] (Scheme 4). According to the authors, these complexes are and can be stored under argon for several months without noticeable decomposition. While the catalytic performances of these complexes were investigated other organometallic species were observed and are assumed to act as the active catalyst [20]. The formation of indenylidene pattern being presumed, investigations on the related mechanism were carried out.

Among the numerous catalysts developed to mediate olefin metathesis transformations, ruthenium–indenylidene complexes are robust and powerful pre-catalysts. The discovery of this catalyst category was slightly muddled due to a first misassignment of the compound structure. This report provides an overview of the synthetic routes for the construction of the indenylidene pattern in ruthenium complexes. The parameters relating to the indenylidene moiety construction will be discussed as well as the mechanism of this formation.

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