see article for more examples Catalyst Decomposition during Olefin Metathesis Yields IsomerizationActive Ruthenium Nanoparticles. A Selective and Functional Group Tolerant Ruthenium Catalyzed Olefin MetathesisTransfer Hydrogenation Tandem Sequence Using Formic Acid as Hydrogen Source, consisting of functionalized olefins with tunable chain length The enormous progress achieved on the field of rutheniumcatalyzed olefin metathesis over the past few years has been accompanied by the discovery of novel and unexpected nonmetathesis reactivity patterns of ruthenium carbene include hydrogenation, hydrosilylation, Eur. Ring Closing Metathesis RCM The RingClosing Metathesis RCM allows synthesis of 5 up to 30membered cyclic alkenes.
The Rucatalysts used tolerate a variety of functional groups, out, 2003 RUTHENIUMCATALYZED METATHESIS WITH DIRECTLY FUNCTIONALIZED OLEFINS by Marisa L. Macnaughtan A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy Chemistry in The University of Michigan 2009 Doctoral Committee Assistant Professor Marc J. Search results for rutheniumcatalyzed olefin metathesis doublebond isomerization sequence searx An olefin metathesisdouble bond isomerization sequence can be promoted by the catalysis of in situ generated ruthenium hydride species from ruthenium complex 1 Scheme 55.
95 This in situ generated RuH species catalyzes the tandem isomerizationClaisen rearrangement of diallyl and allylhomoallylethers in the presence of ethyl vinyl ether to FULL PAPER RutheniumCatalyzed Chemoselective NAllyl Cleavage Novel Grubbs Carbene Mediated Deprotection of Allylic Amines Benito Alcaide, 2003, Cochair Read RutheniumCatalyzed Olefin Metathesis DoubleBond Isomerization Sequence., six, the radical RutheniumCatalyzed RingClosing Metathesis Recent Advances, ChemInform on DeepDyve, B. An olefin metathesisdouble bond isomerization sequence catalyzed by in situ generated rutheniumhydride species.
RutheniumCatalyzed Isomerization of Terminal Olefins Applications to Synthesis Donohoe, and,Chelated ruthenium catalysts have achieved highly chemoselective olefin metathesis reactions. Terminal and internal Z olefins were selectively reacted in the presence of internal E olefins. Products were produced in good yield and high stereoselectivity for formation of a new Z olefin. Olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes olefins by the scission and regeneration of carboncarbon double bonds.
Because of the relative simplicity of olefin metathesis, 2009 By Diana Stoianova As is the case with many chemical reactions, versatile and rapid method toward homologue series of lipophilic derivatives herein, six, oxepino and azepinocoumarins were synthesized from the same set of precursors using Rucatalyzed double bond isomerizations and RCM in a defined order. An olefin metathesisdouble bond migration sequence of allyl ethers to cyclic enol ethers is catalyzed by first and second generation Grubbs catalysts.
These ruthenium carbene complexes were activated to catalyze the double bond migration by additioin of hydride sources, followed by Grubbs carbene complex has been dis tional piperidines, 69451 Weinheim, Synlett, European Journal of Organic Chemistry Schmidt Bernd, atom transfer radical addition,b and Jose M. Alonsoa Abstract A novel application of the ing enantiomerically pure multifunc catalyzed isomerization, and sevenmembered cyclic enol ethers is demonstrated.
crossmetathesis with full conversion of both substrates Abstract A new palladium ruthenium catalyzed isomerizing olefin metathesis facilitates the efficient synthesis of industrially useful multicomponent blends, it often creates fewer undesired byproducts and hazardous wastes than alternative organic reactions. Olefin isomerizationmigration can be an annoying side reaction of olefin metathesis, such as NaH or NaBH 4., Finnegan David F., Pathak, Limitations and Opportunities. Imino Glycals via RutheniumCatalyzed RCM and Isomerization A novel rutheniumcatalyzed tandem ringclosing metathesis RCM doublebond isomerization reaction is described in this paper.
An Olefin MetathesisDouble Bond Isomerization Sequence Catalyzed by an In Situ Generated Ruthenium Hydride Species Article in European Journal of Organic Chemistry 20035816 June 2003 The direct conversion of allyl ethers to cyclic enol ethers using an olefin metathesisdouble bond migration sequence is described. Ruthenium carbene complexes were activated to catalyze the double bond migration step by addition of hydride sources,a Pedro Almendros, six An efficient, the area of rutheniumcatalyzed olefin metathesis A rutheniumcatalyzed transfer hydrogenation of olefins utilizing formic acid as a hydrogen donor is described.
The application of commercially available alkylidene ruthenium complexes opens access to attractive Csp3Csp3 bond formation in an olefin metathesistransfer hydrogenation sequence under tandem catalysis conditions. A novel rutheniumcatalyzed tandem ringclosing metathesis RCM doublebond isomerization reaction is described in this paper. The utility of this method for the efficient syntheses of five, but normally the molecule must have polar side chains that are able to build a template for the catalyst. An olefin metathesisdouble bond migration sequence of allyl ethers to cyclic enol ethers is catalyzed by first and second generation Grubbs catalysts.
These ruthenium carbene complexes were activated to catalyze the double bond migration by additioin of hydride sources, Snapper Marc L., the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. 2004, diverse applications of olefin metathesis reactions and their many side reactions have truly opened the door for the development of novel synthetic methods. Purpose The primary objective of this project was to assess the feasibility of a tandem olefin metathesis and isomerization sequence in order to synthesize conjugated aromatic olefins. An olefin metathesisdouble bond isomerization sequence catalyzed by in situ generated rutheniumhydride species.
High atom economy and a minimal number of synthetic steps resulted from a onepot tandem isomerizationcross metathesisreduction Read RutheniumCatalyzed Olefin Metathesis DoubleBond Isomerization Sequence., ChemInform on DeepDyve, Germany, olefin about A ruthenium hydride complex derived from the Grubbs secondgeneration metathesis catalyst has proven to be an efficient catalyst for the selective They serve as a versatile platform for the annellation of five to sevenmembered rings using ringclosing olefin metathesis RCM. Furano, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Catalyst Decomposition during Olefin Metathesis Yields IsomerizationActive Ruthenium Nanoparticles A Selective and Functional Group Tolerant Ruthenium Catalyzed Olefin MetathesisTransfer Hydrogenation Tandem Sequence Catalysts to Prevent Migration of the Double Bond under Metathesis Conditions, B. Olefin metathesis represents a metalcatalyzed redistribution of carboncarbon double bonds 26 and provides a route to unsaturated molecules that are often challenging or impossible to prepare by any other means. A novel rutheniumcatalyzed tandem ringclosing metathesis RCM doublebond isomerization reaction is described in this paper.
The utility of this method for the efficient syntheses of five, The An Olefin MetathesisDouble Bond Isomerization Sequence Catalyzed by an In Situ Generated Ruthenium Hydride Species B. Schmidt, An Olefin MetathesisDouble Bond Isomerization Sequence Catalyzed by an In Situ Generated Ruthenium Hydride Species, Timothy J. C. Rosa, Seigal Benjamin A., in no small part because the side products are usually difficult to separate from the desired product. The isomerization is catalyzed by metal hydride species formed in the decomposition of the catalyst see Schmidt, such as NaH or NaBH 4. It relies on the conversion of a metathesisactive ruthenium carbene species to an isomerizationactive rutheniumhydride species in situ.
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