Formation of a Stable Cyclopropenylium Betaine

Zirconocene-(μ-Organyl)borate Betaines Derived by Treatment of a (σ-Alkenyl)(σ-alkynyl)zirconocene Complex with Tris(pentafluorophenyl)borane⋆

“…[5] and ref. [9] . The reagents (hydrido)zircono-were removed in vacuo and the residue washed twice with 5 ml of cene chloride [10] and tris(pentafluorophenyl)borane [7] were pre-pentane.…”

“…[5] [9] It would be interesting to know whether this chemistry equivalent of the starting material 1 to form the CC-coupled product 3 which contains a planar-tetracoordinate car-of conjugated metallocene cations could be extended from metallapropargyl to metallaallyl systems. [3] Which of the bon atom (C 3 ) at a bridgehead-position of the dimetallabicyclic framework.…”

Reactivity of C1‐Symmetric Heteroarylamido Hafnium Complexes towards Unsaturated Electrophilic Molecules: Development of New Families of Olefin Polymerization Catalysts

“…Zr-and Ti-based ketimide complexes are quite common, [25] whereas there are scarce examples of hafnium ketimide complexesd escribed in the literature. [26] Crystals of complex 1h suitable for X-ray diffractions tudy were grown from as aturated hexane solution. The solid-state structure, as determined by XRD, is shown in Figure 12.…”

Unusual demetalation of iron from [2]ferrocenophane skeleton of di‐nuclear ferracycle carbonyl complex

“…Reports are available on demetalation of tricarbonyl (diene)iron and tricarbonyl(η 4 ‐cyclopentadienone) iron complexes by photochemically induced exchange of the carbonyl ligands [1d]. Some other examples of demetalation include bis (propynyl)metallocene (M = Zr or Hf), when treated with tris (pentafluorophenyl)borane, followed by trapping of isonitrile or nitrile reagent which subsequently cleaved by MeOH . Demetalation of zirconium chloride from a‐methylenylzirconacyclopentene complexes is observed on treatment with 3 N HCl .…”

“…[1d] Some other examples of demetalation include bis (propynyl)metallocene (M = Zr or Hf), when treated with tris (pentafluorophenyl)borane, followed by trapping of isonitrile or nitrile reagent which subsequently cleaved by MeOH. [4] Demetalation of zirconium chloride from amethylenylzirconacyclopentene complexes is observed on treatment with 3 N HCl. [5] The reaction of bis (phenylethynyl)silanes (PhC ≡ C) 2 SiR 2 (R = Me, Et, Ph) with [Cp 2 ZrEt 2 ] followed by treatment with iodine led to the formation of demetallated diphenyldiyne.…”