- Molybdenum and tungsten imido alkylidene complexes as efficient olefin-metathesis catalysts.
Molybdenum and tungsten imido alkylidene complexes as efficient olefin-metathesis catalysts.
Angewandte Chemie (International ed. in English) (2003-10-09)
Richard R Schrock, Amir H Hoveyda
PMID14533149
ABSTRAKT
Catalytic olefin metathesis has quickly emerged as one of the most often-used transformations in modern chemical synthesis. One class of catalysts that has led the way to this significant development are the high-oxidation-state alkylidene complexes of molybdenum. In this review key observations that resulted in the discovery and development of molybdenum- and tungsten-based metathesis catalysts are outlined. An account of the utility of molybdenum catalysts in the synthesis of biologically significant molecules is provided as well. Another focus of the review is the use of chiral molybdenum complexes for enantioselective synthesis. These highly efficient catalysts provide unique access to materials of exceptional enantiomeric purity and often without generating solvent waste.
MATERIAŁY
Numer produktu
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Tungsten, foil, light tested, 25x25mm, thickness 0.025mm, as rolled, 99.95%
Tungsten, insulated wire, 5m, conductor diameter 0.0125mm, insulation thickness 0.0035mm, polyimide insulation, 99.9%
Tungsten, insulated wire, 0.2m, conductor diameter 0.015mm, insulation thickness 0.002mm, polyimide insulation, 99.9%
Tungsten, foil, light tested, 150x150mm, thickness 0.075mm, as rolled, 99.95%
Tungsten, insulated wire, 20m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%
Tungsten, foil, 5m coil, thickness 0.05mm, coil width .51mm, as rolled, 99.95%
Tungsten, foil, 5m coil, thickness 0.10mm, coil width .9mm, as rolled, 99.95%
Tungsten, foil, 5m coil, thickness 0.1mm, coil width 1.5mm, as rolled, 99.95%
Tungsten, insulated wire, 0.5m, conductor diameter 0.015mm, insulation thickness 0.002mm, polyimide insulation, 99.9%
Tungsten, foil, not light tested, 25x25mm, thickness 0.004mm, 99.95%
Tungsten, foil, 5m coil, thickness 0.035mm, coil width .5mm, as rolled, 99.95%
Tungsten, insulated wire, 2m, conductor diameter 0.0125mm, insulation thickness 0.0035mm, polyimide insulation, 99.9%
Tungsten, foil, 5m coil, thickness 0.025mm, coil width 1mm, as rolled, 99.95%
Tungsten, foil, light tested, 150x150mm, thickness 0.025mm, as rolled, 99.95%
Tungsten, microfoil, disks, 10mm, thinness 0.1μm, specific density 182μg/cm2, permanent mylar 3.5μm support, 99.95%
Tungsten, insulated wire, 2m, conductor diameter 0.015mm, insulation thickness 0.002mm, polyimide insulation, 99.9%
Tungsten, insulated wire, 0.2m, conductor diameter 0.0125mm, insulation thickness 0.0035mm, polyimide insulation, 99.9%
Tungsten, foil, light tested, 150x150mm, thickness 0.05mm, as rolled, 99.95%
Tungsten, microfoil, disks, 10mm, thinness 0.05μm, specific density 96μg/cm2, permanent mylar 3.5μm support, 99.95%
Tungsten, insulated wire, 5m, conductor diameter 0.075mm, insulation thickness 0.02mm, PTFE (polytetrafluoroethylene) insulation, 99.9%
Tungsten, insulated wire, 10m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%
Tungsten, foil, not light tested, 25x25mm, thickness 0.006mm, 99.95%
Tungsten, microfoil, disks, 10mm, thinness 0.25μm, specific density 474μg/cm2, permanent mylar 3.5μm support, 99.95%
Tungsten, insulated wire, 2m, conductor diameter 0.025mm, insulation thickness 0.005mm, polyimide insulation, 99.9%
Tungsten, foil, not light tested, 100x100mm, thickness 0.0125mm, 99.95%
Tungsten, lump, 100g, max. size 5mm
Tungsten, insulated wire, 10m, conductor diameter 0.075mm, insulation thickness 0.02mm, PTFE (polytetrafluoroethylene) insulation, 99.9%
Tungsten, insulated wire, 5m, conductor diameter 0.05mm, insulation thickness 0.008mm, polyimide insulation, 99.9%
Tungsten, foil, light tested, 25x25mm, thickness 0.015mm, 99.95%
Tungsten, foil, not light tested, 50x50mm, thickness 0.004mm, 99.95%