Microreview doi: 101002/ejoc201000570 metathesis reactions of carbohydrates: recent highlights in cross-metathesis ana aljarilla,[a] j cristóbal lópez,[b] and joaquín plumet[a] dedicated to prof dr antonio garcía martínez on the occasion of his retirement keywords: cross metathesis / carbohydrates / cyclodextrins / porphyrins. Concentrate on the recent applications of ring-closing metathesis (rcm) and cross- metathesis (cm) reactions for the design of useful molecules and architectures: new functional macrocycles (rcm) and multifunctional linear alkenes (cm), but also. To our point of view, no polymer chemist active in the field of metathesis polymerisation should miss the latest trends and of course the fundamentals of eg ring closing metathesis, ring opening cross metathesis, ene-yne metathesis, alkyne metathesis or crossmetathesis, themore as these reactions are part ofmost poly- merisation equilibria.
Metathesis reactions are chemical reactions in which two hydrocarbons (alkanes, alkenes or alkynes) are converted to two new hydrocarbons by the exchange of carbon-carbon single, double or. Cross metathesis the transalkylidenation of two terminal alkenes under release of ethene, catalyzed by ruthenium carbenoids (grubbs catalyst. Olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds   because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative organic reactions.
Metathesis reactions of carbohydrates: recent highlights in cross-metathesis ana aljarilla , j cristóbal lópez , joaquín plumet european journal of organic chemistry 2010 2010 (32), 6123-6143. Olefin metathesis olefin metathesis is a chemical reaction in which a molecule with a pair of carbon-carbon double bonds, known also as olefins or hydrocarbons, come together and exchange carbon atoms with one another, forming new value-added molecules in the process.
Cross metathesis (cm) is an attractive alternative to other olefination methods due to the large variety of commercially available olefin starting materials and to the high functional group tolerance of the ruthenium metathesis catalysts. The reactions were carried out in the presence of hoveyda-grubbs 2nd generation catalyst (hg ii), which has been shown to be the best catalyst for cross-metathesis reactions running the reaction under the standard conditions in dichloromethane or toluene under reflux, the desired cross-metathesis product α- 4a was isolated in low 10% and 3.
How to cite aljarilla, a, lópez, j c and plumet, j (2010), metathesis reactions of carbohydrates: recent highlights in cross-metathesis eur. This article reviews metathesis patents and patent applications published within the past year focused on newly patented catalyst structures, use of metathesis for conversion of seed oils to high value products, and catalysts that are z-selective in cross metathesis reactions.
Read cheminform abstract: metathesis reactions of carbohydrates: recent highlights in cross‐metathesis, cheminform on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The key is a selective yne-ene cross metathesis between a terminal alkyne and a terminal alkene to yield 1,3-disubstituted butadienes, followed by a subsequent mealcl 2-catalyzed diels- alder transformation with methyl vinyl ketone (eg, x = ch acc = c(o)me. On the other hand, carbohydrates have gained well-deserved relevance in the study of biological processes this review summarizes a decade of efforts in the application of cross metathesis (cm) reactions to the preparation of some relevant glycoconjugates.
Highlights of the recent us patent literature: focus on metathesis abstract: metathesis catalysts and applications of the metathesis reaction have been an area of active patenting. Ring-closing metathesis, or rcm, is a widely used variation of olefin metathesis in organic chemistry for the synthesis of various unsaturated rings via the intramolecular metathesis of two terminal alkenes, which forms the cycloalkene as the e-or z-isomers and volatile ethylene.
Mechanism of the enyne metathesis enyne metathesis, or the so-called cycloisomerization reactions, were first reported using palladium(ii) and platinum(ii) salts and are mechanistically distinct from metal carbene-mediated pathways. The key step of these transformations was the sequence ring-opening metathesis-cross metathesis (rom-cm) reactions of the oxabicyclic compounds in the presence of ethylene and using commercially.