3 results about "Pentamethylcyclopentadiene" patented technology

The invention relates to the technical field of high polymer materials, and particularly provides a syndiotactic polystyrene-methylstyrene copolymer and a preparation method thereof. Comprising the following steps: dissolving pentamethylcyclopentadienyl titanium trichloride in toluene to form a catalyst solution; and mixing tetrahydrofuran, styrene, alpha-methyl styrene, MMAO, n-butyllithium, the catalyst solution and a binuclear scandium catalyst in an inert atmosphere, sequentially carrying out prepolymerization and pressurized main polymerization reaction in a temperature range of room temperature to 80 DEG C, pouring the solution into acidified methanol after the reaction is finished, and carrying out solid-liquid separation and drying to obtain the product. According to the invention, an innovative dual-catalyst system is adopted, pentamethylcyclopentadienyl titanium trichloride and a binuclear scandium catalyst are synergistically utilized, and the copolymer with ideal fluidity is efficiently prepared under optimized reaction conditions.

This invention relates to the field of organometallic complex catalysis, specifically disclosing an organometallic iridium complex capable of efficiently and selectively catalyzing the regeneration of coenzyme NADH and its preparation method. The organometallic iridium complex is a novel pentamethylcyclopentadienyl (Cp*)pyridinesulfonamide iridium complex. The advantage of this invention is that this organometallic iridium complex can efficiently and selectively catalyze the oxidation of coenzyme NAD. + Low-temperature hydrogenation converts it into reduced coenzyme NADH, and it exhibits good biocompatibility.

This invention belongs to the field of chemical production technology, specifically disclosing a purification method for trimethoxy(pentamethylcyclopentadienyl)titanium, comprising the following steps: vacuum distillation of crude trimethoxy(pentamethylcyclopentadienyl)titanium raw material to obtain a crude distillate; adding 5-20 parts by mass of a modifier to 100 parts by mass of the crude distillate, wherein the modifier is at least one selected from triethylene glycol dibutyl ether, tetraethylene glycol dibutyl ether, n-heptadecane, n-octadecane, and mineral oil, and then distilling to obtain the product. This invention achieves large-scale purification of Star-Ti, achieving a distillation yield of over 75%, with a maximum of over 95%, and obtaining a high-purity product with an organic purity of over 99.5%, solving the problems of difficult large-scale purification, difficulty in purity improvement, and low recovery rate of Star-Ti in existing technologies.