8 results about "Pentamethylcyclopentadiene" patented technology

The invention relates to the technical field of synthesis of aryl acetylene derivatives, in particular to an aryl acetylene derivative as well as a preparation method and application thereof. Comprising the following steps: by taking pentamethylcyclopentadienyl carbonyl cobalt diiodide as a metal catalyst, jointly dissolving N-(substituted phenyl) pivalamide, an alkyne bromide derivative, the metal catalyst, a first silver salt additive and a second silver salt additive in 1, 2-dichloroethane, and performing hydrocarbon activation reaction to obtain an aryl acetylene derivative; wherein the first silver salt additive is silver trifluoromethanesulfonate, silver tetrafluoroborate or silver hexafluoroantimonate; and the second silver salt additive is silver carbonate or silver acetate. According to the preparation method of the aryl acetylene derivative, the aryl acetylene derivative can be efficiently and rapidly synthesized in one step, and the technical problems that traditional reaction conditions are harsh and operation is complex are solved. The method has the advantages of low cost, high yield, simplicity and convenience in operation and no pollution, and has a potential industrial application prospect.

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 relates to a method for preparing bis(pentamethylcyclopentadienyl)ruthenium(II), belonging to the field of noble metal organometallic compound synthesis technology. The method involves de-airing a solvent and pentamethylcyclopentadiene to obtain a pretreated solvent and pretreated pentamethylcyclopentadiene, respectively. Under a protective atmosphere, ruthenium chloride is dissolved in the pretreated solvent to obtain a ruthenium solution. A reducing agent and pentamethylcyclopentadiene are added sequentially to the ruthenium solution, and the mixture is heated uniformly to 50-90°C and stirred for 4-10 hours. After cooling and crystallization, the solid and liquid are separated. The solid is washed sequentially with deionized water and methanol, and dried to obtain crude bis(pentamethylcyclopentadienyl)ruthenium(II). The crude bis(pentamethylcyclopentadienyl)ruthenium(II) is dissolved in hot anhydrous ethanol, filtered to remove impurities, and the filtrate is cooled and crystallized. After solid-liquid separation, the solid is dried to obtain high-purity bis(pentamethylcyclopentadienyl)ruthenium(II). This invention has a simple method, a product yield greater than 74%, and a purity of over 98%.

The application discloses a method for synthesizing diphenylamine from aniline. μ -H)3IrCp*][X] (Cp*: pentamethylcyclopentadiene; X: BF4 — , PF6 — , BPh4 — , CF3SO3 — ) as a catalyst, and diphenylamine is obtained under the conditions of a reaction temperature of 100-300 DEG C and a reaction pressure of 0.5-4.0 MPa. The method has high aniline conversion rate and good diphenylamine selectivity, and the catalyst can be recovered through solvent polarity adjustment after the reaction is completed.

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.

The application discloses rhodium catalytic hydrogen activation for preparation of novel amino acids, and belongs to the technical field of organic synthesis. The method comprises the following steps: adding lysine derivative, disubstituted alkyne, pentamethylcyclopentadienyl rhodium catalyst, cesium acetate and anhydrous copper acetate into a reactor; stirring in a solvent; after the reaction is completed, removing the solvent by using a rotary evaporator to obtain a crude product; and separating the crude product by using a silica gel column chromatography to obtain a target compound. The synthesis method of the novel amino acid has the characteristics of scientific rationality, simple operation, high yield of the target compound, easy purification of the product, fluorescence activity and the like. The reaction equation is as follows.

This invention discloses a β ( Z A method for synthesizing alkenylsilanes of type [Cp*Rh( μ -Cl)3RhCp*][X](Cp*:pentamethylcyclopentadienyl; X:Cl ‑ BF4 ‑ CF3SO3 ‑ Complex-catalyzed hydrosilylation of alkynes enables highly regioselective and stereoselective synthesis. β ( Z () type alkenylsilane compounds. The complex catalyst used in this invention can be recovered and reused by adding a weakly polar solvent to the reaction product and then filtering; at the same time, this invention overcomes the... β ( Z The synthesis of alkenylsilanes is difficult due to their thermodynamic instability. However, the reaction conditions are mild and the operation is simple, making them promising for future applications.