CAS: 12636-72-5; Bis(Cyclopentadienyl)Dimethylzirconium

上下游产品

methyllithium zircon°Cene dichloride methylmagnesium bromide methyl-d3-magnesium iodideTriphenylethan

专利信息

专利号:US-10973847-B2
优先权日:2017-06-30
标题 :Core-to-surface polymerization for the synthesis of star polymers and uses thereof
发明人：JOHNSON JEREMIAH A; GOLDER MATTHEW R
权利人:MASSACHUSETTS INST TECHNOLOGY
摘要:Disclosed are methods, compositions, reagents, systems, and kits to prepare star polymers, as well as compositions and uses thereof. Various embodiments show that synthesis of these polymers contain low metal concentration to provide polymers for diverse biomedical applications including in vivo applications.

专利号:US-6121377-A
优先权日:1998-09-10
标题 :Process for the production of thermoplastic elastomeric polyolefin alloys, including syndiotactic-atactic polypropylene alloys and isotactic-atactic polypropylene alloys, and catalysts therefore
发明人：CHIEN JAMES C W
权利人:ACADEMY OF APPLIED SCIENCES; RINES AND RINES
摘要:This invention relates to thermoplastic elastomeric polyolefin alloys (preferably polypropylene alloys) and the processes for preparing naturally compatibilized polyolefin alloys using a 'one-pot' polymerization of a single monomer (preferably propylene), whereby two homopolymers having different stereoisomeric structures are produced (preferably stereoregular and stereoirregular), as well as a third block copolymer having alternating sequences of the two structural segments of the two homopolymers; and wherein catalyst compositions are used enabling the direct synthesis of naturally compatibilized polymer blends comprising for components: two organometallic complexes of group IVB elements, a catalyst which irreversibly reacts with at least one ligand on the transition metal complexes converting it to catalytically active state, and a hydrocarbyl, substituted hydrocarbyl, or oxyhydrocarbyl compound of Group IIA, IIB, and IIIA metals, which functions as a cross-over agent.

专利号:US-2023357286-A1
优先权日:2020-07-24
标 题:Ketone synthesis and applications
发明人：KISHI YOSHITO; UMEHARA ATSUSHI
权利人:HARVARD COLLEGE
摘要:Provided are new nickel./zirconium-mediated coupling reactions useful in the synthesis of ketone-containing compounds, e.g., halichondrin natural products and related molecules. A feature of the present disclosure is the use of a nickel(I) catalyst in tandem with a nickel (II) catalyst in the Ni/Zr-mediated coupling reactions. Without wishing to be bound by any particular theory, the nickel (I) catalyst selectively activates the electrophilic coupling partner (i.e., the compound of Formula (A)), and the nickel(ll) catalyst selectively activates the nucleophilic coupling partner (i.e., a thioester of Formula (B)). This dual catalyst system leads to improved coupling efficiency and eliminates the need for a large excess of one of the coupling partners (i.e., a compound of Formula (A) or (B)).

专利号:US-6124400-A
优先权日:1998-09-10
标 题 :Semicrystalline polymer alloy and process for preparation
发明人：CHIEN JAMES C W
权利人:ACADEMY OF APPLIED SCIENCES
摘要:This invention relates to polymer alloys and the 'one-pot' polymerization process for preparing the same from a single monomer, wherein the product is comprised of two semi-crystalline homopolymers having different micro-structures and a well-defined block copolymer having alternating sequences of the two structural segments of the homopolymers, and with the formed alloy being 'naturally' compatible without the need for thermomechanical mixing or addition of a compatibilizing additive, including the presence of a comonomer and formed with catalyst compositions enabling the direct synthesis of 'naturally' compatibilized polymer alloy that combines four components: two components being organometallic complexes of Group IVB or VIII elements, a third component being a cocatalyst which irreversibly reacts with at least one nonhapto ligand on the transition metal complex, and a fourth component that is a cross-over agent selected from the group of hydrocarbyl or substituted hydrocarbyl compound of Group IIA, IIB or IIIA elements.

专利号:US-7129197-B2
优先权日:2001-08-31
标题 :Synthesis of poly-alpha olefin and use thereof
发明人：SONG WEI; HEILMAN WILLIAM J
权利人:SHELL OIL CO
摘要:One or more oligomers of an olefin are prepared in the presence of a single-site catalyst. Preferably, the olefin is an α-olefin, and the oligomers are a poly-alpha-olefin (PAO). The PAO so prepared is completely or substantially free of tertiary hydrogen resulting from isomerization. Consequently, the PAO possesses improved biodegradability, improved oxidation resistance, and/or a relatively higher viscosity index. The PAO has many useful applications, such as a component of a lubricant.

专利号:US-2023047214-A1
优先权日:2020-02-03
标题:Methods for microwave synthesis of degradable polymers for drug delivery
发明人：MURATOGLU ORHUN K; ORAL EBRU; GRINDY SCOTT
权利人:MASSACHUSETTS GEN HOSPITAL
摘要:Provided herein are methods of making degradable, additive-blended polymeric materials using microwave radiation and catalysts. The methods can include incorporation of therapeutic materials into the polymeric materials. There also are provided polymeric materials made by the methods and medical devices comprising the polymeric materials made by the methods.