Abstract: The disclosure provides methodology for the synthesis of mono-alkylated cyclopentadiene structures, which can be obtained via fulvene intermediates. In one embodiment, the cyclopentadiene ring is substituted with a trialkylsilyl moiety, which enables the further reaction with certain metal halides to form metal adducts. For example, the monoalkyl cyclopentadienes substituted with a trimethylsilyl group can be reacted with TiCl4 to provide R*CpTiCl3 complexes, wherein R* is a group of the formula wherein R1 and R2 are as defined herein.

Abstract: The disclosure provides a process for preparing bis(monoalkyl-substituted cyclopentadiene) tungsten hydride compounds, for example bis(isopropylcyclo-pentadienyl) tungsten dihydride, via the corresponding magnesium compound and tungsten hexachloride, followed by treatment with a hydride reagent. Also provided is a process for preparing bis(monoalkyl-substituted cyclopentadiene) metal halide compounds. This latter aspect is achieved by reaction of the corresponding magnesium compound with a metal halide. Exemplary metals in this process include hafnium, zirconium, titanium, tantalum, niobium, tungsten, and molybdenum.

Abstract: The disclosure provides methodology for the synthesis of mono-alkylated cyclopentadiene structures, which can be obtained via fulvene intermediates. In one embodiment, the cyclopentadiene ring is substituted with a trialkylsilyl moiety, which enables the further reaction with certain metal halides to form metal adducts. For example, the monoalkyl cyclopentadienes substituted with a trimethylsilyl group can be reacted with TiCl4 to provide R*CpTiCl3 complexes, wherein R* is a group of the formula wherein R1 and R2 are as defined herein.

Abstract: The disclosure provides an improved method for preparing monoalkylated cyclopentadiene species in high yield and selectivity. In the process, either a solution of dicyclopentadiene magnesium or a cyclopentadiene magnesium halide is reacted with an alkylating agent in the presence of a modifying agent to provide the monoalkylated product. In the process of the disclosure, only a mono-alkylated species is produced with no detectible amount of dialkylated product observed.

Abstract: The disclosure provides a process for preparing bis(monoalkyl-substituted cyclopentadiene) tungsten hydride compounds, for example bis(isopropylcyclopentadienyl)tungsten dihydride, via the corresponding magnesium compound and tungsten hexachloride, followed by treatment with a hydride reagent. Also provided is a process for preparing bis(monoalkyl-substituted cyclopentadiene) metal halide compounds. This latter aspect is achieved by reaction of the corresponding magnesium compound with a metal halide. Exemplary metals in this process include hafnium, zirconium, titanium, tantalum, niobium, tungsten, and molybdenum.

Abstract: The disclosure provides a process for preparing bis(monoalkyl-substituted cyclopentadiene) tungsten hydride compounds, for example bis(isopropylcyclopentadienyl)tungsten dihydride, via the corresponding magnesium compound and tungsten hexachloride, followed by treatment with a hydride reagent. Also provided is a process for preparing bis(monoalkyl-substituted cyclopentadiene) metal halide compounds. This latter aspect is achieved by reaction of the corresponding magnesium compound with a metal halide. Exemplary metals in this process include hafnium, zirconium, titanium, tantalum, niobium, tungsten, and molybdenum.

Abstract: The disclosure provides methodology for the synthesis of mono-alkylated cyclopentadiene structures, which can be obtained via fulvene intermediates. In one embodiment, the cyclopentadiene ring is substituted with a trialkylsilyl moiety, which enables the further reaction with certain metal halides to form metal adducts. For example, the monoalkyl cyclopentadienes substituted with a trimethylsilyl group can be reacted with TiCl4 to provide R*CpTiCl3 complexes, wherein R* is a group of the formula wherein R1 and R2 are as defined herein.

Abstract: The disclosure provides a facile process for preparing certain half-sandwich titanocene compounds. The compounds are useful in catalyst systems for polyolefin synthesis. In one embodiment, highly-pure trimethyl(pentamethylcyclopentadienyl)titanium (IV) is produced from the reaction of trichloro(pentamethylcyclopentadienyl)titanium (IV) with a methyl magnesium halide compound.