Concept

Élimination réductrice

Publications associées (46)

Copper Complexes of Nitrogen-Anchored Tripodal N-Heterocyclic Carbene Ligands

Incorporation of a nitrogen functionality into a tripodal N-heterocyclic carbene ligand system affords the first N-anchored tetradentate tris-carbene ligands TIMENR I (R = Me (5a), t-Bu (5b), Bz (5c)). Treatment of the Me derivatized H3TIMENMe3 imid ...

2003

Minor modifications to the ligands surrounding a ruthenium complex lead to major differences in the way in which they catalyse the hydrogenation of arenes

Paul Joseph Dyson, Gabor Laurenczy

The hydrogenation of benzene and other arenes under aqueous-organic biphasic conditions is evaluated using the ruthenium complexes Ru(eta(6)-C10H14)(pta)Cl-2 (pta=1,3,5-triaza-7-phosphaadamantane), Ru(eta(6)-C10H14)(tppts)Cl-2 (tppts=tris-3-sulfonatophenyl ...

2003

2-Ethoxyvinyllithiums and diethoxyvinyllithiums: what makes them stable or fragile?

The elusive (E)-2-ethoxyvinyllithium can be readily generated in THF at -75 Deg from (E)-1-bromo-2-ethoxyethylene by halogen/metal exchange and subsequently trapped with electrophiles. Alkylation opens a convenient entry to (E)-configurated enethers. (E)-2 ...

1997

Synthesis of Alpha-(1-]2)-, Alpha-(1-]3)-, Alpha-(1-]4)-, and Alpha-(1-]5)-C-Linked Disaccharides through 2,3,4,6-Tetra-O-Acetylglucopyranosyl Radical Additions to 3-Methylidene-7-Oxabicyclo[2.2.1]Heptan-2-One Derivatives

Pierre Vogel

The ''naked sugar'' (+)-1 (1R,2S,4R)-2-cyano-7-oxabicyclo[2.2.1]hept-5-en-2-yl (1S')-camphanate) has been converted into (+)-(1R,4R,5R,6R)-3-methylidene-5-exo,6-exo(isopropylidenedioxy)-7-oxabi cyclo[2.2.1]heptan-2-one ((+)-3) and (-)-(1S,4R,5R,6R)-5-exo-( ...

1992

Ring opening of gem-dihalocyclopropanes: novel types of 1,4-elimination reactions

On treatment with Bu4N+ F-, cyclopropanecarboxylates I (R = Cl; R1 = Cl, F; R2 = OCMe3) undergo Cl-F exchange via cyclopropene intermediates. As a byproduct, H2C:CMeC.tplbond.CCO2CMe3 (II) is formed. I (R = R1 = Cl, R2 = CO2CMe3), II, and Me2CClC.tplbond.C ...

1990

Base Promoted 1,4-Elimination Reactions : On the Origin of an Eventual syn-Stereoselectivity

Rate ratios were obtained for the base-catalyzed 1,4-dehydrochlorination of (E)- and (Z)-Me3CCCl:C:C:CClCMe3 to give Me3CC.tplbond.CC.tplbond.CCMe3. In the KOMe/MeOH or KOCMe3/Me2SO systems the reactivity of both isomers was similar. With KOCMe3 in Me3COH, ...

1981

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