Tungsten hexachloride is the chemical compound of tungsten and chlorine with the formula wcl6 this dark violet blue species exists as a volatile solid under standard conditions it is an important starting reagent in the preparation of tungsten compounds. Tungsten hexachloride-tetraphenyltin based catalysts for metathesis, i spectroscopic investigation march 1982 reaction kinetics and catalysis letters wcl6 in benzene is reduced not only by ph4 sn but also by ph3sncl or ph2 sncl2 (in contrast to alkyltin chlorides.
Phenylacetylene pentene, cyclopentene, induces cycloheptene, tungsten hexachloride and cyclooctene to initiate in metatheses too large amounts, of cis-2-how- ever, it i's ineffective the reactions are run in the atmosphere. Tungsten hexachloride and tetraphenyltin as the catalyst system 26f the attempted polymerizations of indene and norbornene 52 using organic bases with the catalyst system tungsten hexachloride and tetraphenyltin 26g the polymerization of acenaphthylene using concentrated 52 sulphuric acid as initiator 2oh. Developing new and efficient homogeneous and heterogeneous catalysts for ring opening metathesis polymerization (romp) has attracted widespread interest over the past decade , , , , we first reported romp of dicyclopentadiene (dcpd) by polymer supported tungsten catalytic system , ,. Tungsten(vi) chloride ≥999% trace metals basis cas number: 13283-01-7 ec number: 236-293-9 synonym: tungsten hexachloride linear formula: cl6w find aldrich-241911 msds, related peer-reviewed papers, technical documents, similar products & more at sigma-aldrich.
Improved homogeneous metathesis catalysts are obtained by the use of a trivalent phosphorus modifying agent with a cocatalyst comprised of tungsten hexachloride and an organotin compound these modified catalyst systems give significantly increased conversions and excellent product selectivity when used for olefin metathesis. Grubbs and schrock deserve accolades for olefin metathesis, but in the early days, others helped to unlock the key to the reaction chauvin proposed the involvement of metal carbenes katz suggested preparing metal carbenes and using them to initiate olefin metathesis and then showed that isolable metal carbenes initiate olefin metathesis. Tungsten hexachloride enables ring opening metathesis polymerization (romp), a process step in manufacturing high quality caoutchouc additives for high performance rubber, tires, recycled rubber and road surfaces.
Tungsten hexachloride can be prepared by chlorinating tungsten metal in a sealed tube at 600 °c: w + 3 cl 2 → wcl 6 properties and reactions tungsten (vi) chloride is a blue-black solid at room temperature at lower temperatures, it becomes wine-red in color. Induction of olefin metathesis by phenylacetylene plus tungsten hexachloride by thomas j katz, chien-chung han prepared for publication in organometallics columbia university tungsten hexachloride to polymerize three cyclic olefins (eq 2), reactions that (as seen in the table) occur inavoreciably, if at all, when. Ca1094108a – improved olefin metathesis process – google patents the catalyst is obtained by the use of a trivalent phosphorous modifying agent with a cocatylst comprised of tungsten hexachloride and the metathesis reaction can metathesis of unsaturated fatty acids: synthesis of long ters in the presence of tungsten hexachloride (wcl6) and metathesis routes, conversions are low since such reactions are typically subject to thermodynamic control. Macroligand effect of tungsten catalyst for ring opening macroligand effect of tungsten catalyst for ring opening metathesis polymerization of dicyclopentadiene opening metathesis tungsten hexachloride was drying properties of metathesized soybean oil springerlink soybean oil was metathesized with the standard homogenous metathesis catalyst, which consisted of tungsten hexachloride (wcl6) and tetramethyl tin (me4sn) in chlorobenzene as solvent.
Macroligand effect of tungsten catalyst for ring opening metathesis polymerization of dicyclopentadiene developing new and efficient homogeneous and heterogeneous catalysts for ring opening metathesis dcpd, 98% (yanshan petrochemical, china), was rectified under reduced pressure before use tungsten hexachloride was prepared.
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.