Search results for "Magnesium iodide"
showing 3 items of 3 documents
New practical tungsten(VI) based catalyst systems for ring opening metathesis polymerisation
2002
Abstract Tungsten(VI) complexes of the type trans -[WCl 2 (diol)(OAr) 2 ] were studied as catalyst precursors for ROMP of norbornene and dicyclopentadiene. These compounds form active catalysts when treated by simple Grignard reagents, such as methyl magnesium iodide or neophyl magnesium chloride. Moreover, polymerisations can be run under ambient atmosphere without complicated inert atmosphere techniques.
Aminobis(phenolate)s of imidomolybdenum(VI) and -tungsten(VI)
2009
Abstract The reactions of trans-[MoO(ONOMe)Cl2] 1 (ONOMe = methylamino-N,N-bis(2-methylene-4,6-dimethylphenolate) dianion) and trans-[MoO(ONOtBu)Cl2] 2 (ONOtBu = methylamino-N,N-bis(2-methylene-4-methyl-6-tert-butylphenolate) dianion) with PhNCO afforded new imido molybdenum complexes trans-[Mo(NPh)(ONOMe)Cl2] 3 and trans-[Mo(NPh)(ONOtBu)Cl2] 4, respectively. As analogous oxotungsten starting materials did not show similar reactivity, corresponding imido tungsten complexes were prepared by the reaction between [W(NPh)Cl4] with aminobis(phenol)s. These reactions yielded cis- and trans-isomers of dichloro complexes [W(NPh)(ONOMe)Cl2] 5 and [W(NPh)(ONOtBu)Cl2] 6, respectively. The molecular st…
Synthesis and structure of stable cis-dimethyl complex of oxotungsten(VI)
2007
Abstract Oxotungsten(VI) complex cis -[WO(L t Bu )Me 2 ] (L t Bu = methylamino- N , N -bis(2-methylene-4-methyl-6- tert -butylphenolate) dianion) was prepared by the transmetallation reaction of [WO(L t Bu )Cl 2 ] (either cis or trans isomer) with methyl magnesium iodide. This unexpectedly stable dialkyl complex can be activated by Et 2 AlCl to catalyze the ring-opening metathesis polymerization of norbornene.