CAS: 1822-00-0; Lithium,Methanidyl(Trimethyl)Silane

上下游产品

iodo(trimethylsilyl)methane (trimethylsilyl)(tributylstannyl)methane Chloromethyltrimethylsilane pentane chloromethyl(dimethyl)(trimethylsilylmethyl)silane 2,2,6,6-tetramethyl-4,4-dichloro-2,4,6-trisilaheptane °Ctamethyltrisilmethylene 3-methylene-cyclohexene

专利信息

专利号:US-11629223-B2
优先权日:2018-01-11
标 题:Synthesis of polymers from cyclic diolides
发明人：CHEN EUGENE Y; TANG XIAOYAN
权利人:UNIV COLORADO STATE RES FOUND
摘要:Biodegradable polymers with advantageous physical and chemical properties are described, as well as methods for making such polymers. In one embodiment, a new chemical synthesis route to technologically important biodegradable poly(3-hydroxybutyrate) (P3HB) with high isotacticity and molecular weight required for a practical use is described. The new route can utilize racemic eight-membered cyclic diolide (rac-DL), meso-DL, or a rac-DL and meso-DL mixture, derived from bio-sourced dimethyl succinate, and enantiomeric (R,R)-DL and (S,S)-DL, optically resolved by metal-based catalysts. With a stereoselective racemic molecular catalyst, the ROP of rac-DL under ambient conditions produces rapidly P3HB with essentially perfect isotacticity ([mm]>99%), high crystallinity and melting temperature (T m =171° C.), as well as high molecular weight and low dispersity (M n =1.54×10 5 g/mol, à =1.01).

专利号:US-2004132610-A1
优先权日:2003-01-03
标题:Transition metal complexes in the controlled synthesis of polyolefins substituted with functional groups
发明人：TAGGE CHRISTOPHER D; WILSON ROBERT B
摘要:A method is provided for the polymerization of olefins substituted with a functional group using a transition metal catalyst that, by virtue of one or more stabilizing groups incorporated within the catalyst structure, “fixes†the stereoconfiguration of each olefinic monomer relative to the transition metal complex during each successive reaction in the polymerization process. The invention substantially reduces the likelihood of olefin rearrangement at the active site of the catalyst during polymerization. In one particular embodiment, the functional group is a polar, electron-donating group and the stabilizing group is a Lewis acid substituent; examples of polymers that can be prepared with such a system include poly(vinyl acetate), poly(vinyl alcohol), and poly(vinyl ethers). Novel complexes and catalyst systems useful in the polymerization method are also provided.

专利号:US-11897827-B1
优先权日:2022-11-22
标 题 :Carbon isotope exchange mediated by vanadium complexes
发明人：BUKHRYAKOV KONSTANTIN
权利人:BUKHRYAKOV KONSTANTIN; THE FLORIDA INTERNATIONAL UNIV BOARD OF TRUSTEES
摘要:The subject invention provides catalytical compounds/complexes, compositions comprising such compound/complex, synthesis of the compounds/complexes, and methods of using such compounds/complexes as catalysts in, for example, carbon isotope exchange (CIE) on target bioactive molecules. Methods that allow CIE directly on drug candidates are of great importance to chemistry, biology, and medicine. Especially valuable are catalytic procedures that rely on a limited collection of available labeled materials. The instant method comprises converting a methyl group to terminal â• CH2 utilizing transfer dehydrogenation catalysts to enable V-based olefin metathesis, followed by a hydrogenation step. The one-pot strategy allows the formal methylation/demethylation sequence and can be applied to an assortment of alkyl-containing compounds.

专利号:US-9018407-B2
优先权日:2010-10-07
标 题:Stereoselective synthesis of bridged metallocene complexes
发明人：BUCK RICHARD M; YANG QING
权利人:CHEVRON PHILLIPS CHEMICAL CO
摘要:The present invention provides methods of making stereo-enriched ansa-metallocene compounds using an unchelated amine compound. Generally, these methods result in a rac:meso isomer selectivity of the stereo-enriched ansa-metallocene compound of greater than 4:1.

专利号:US-9739423-B2
优先权日:2014-06-13
标 题 :Synthesis and hydrogen storage properties of novel metal hydrides
发明人：ANTONELLI DAVID
权利人:UNIV OF SOUTH WALES COMMERCIAL SERVICES LTD
摘要:The present disclosure relates to improved processes for the preparation of metal hydrides. The present disclosure also relates to metal hydrides, e.g., metal hydrides prepared by the processes described herein, that exhibit enhanced hydrogen storage capacity when used as hydrogen storage systems.

专利号:US-2013123523-A1
优先权日:2011-11-10
标 题:Methods for the preparation of etonogestrel and desogestrel
发明人：NICKISCH KLAUS; SANTHAMMA BINDU
权利人:NICKISCH KLAUS; SANTHAMMA BINDU
摘要:Described herein is a process for the synthesis of etonogestrel and desogestrel and intermediates used to form etonogestrel and desogestrel.