CAS: 12070-06-3; Tantalum Carbide

Tantalum(V) Ethoxide置于乙酰丙酮,蔗糖体系中,用 正丁醇 用作溶剂,化学反应生成碳化钽
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标题:
摘要:Polymeric Precursors For Carbothermal Reactions Were Prepared From Niobium Alkoxide,Tantalum Alkoxide And Molybdenum Ethylene Glycolate,Respectively,By Simultaneous Reaction With A Chelating Reagent (Acetylacetone) And Organic Compounds Having Two Or More Reactive Oh Groups,Such As Ethylene Glycol,Saccharose,Tartaric Acid Or Dihydroxybenzenes. The Precursors Exist In Common Polar And Non-Polar Solvents Mostly As Linear Polymers. The Viscous Solutions Show Rheological Properties That Allow For The Preparation Of Polymer Fibres And Films. At Temperatures Up To 1500 Degrees C,Bulk Precursors As Well As Fibres And Films Were Thermally Converted Into Carbide Powders,Fibres And Coatings. The Structural Transformations Of The Polymeric Materia Is Into Carbides Were Investigated Using Simultaneous Thermogravimetric-Differential Thermal Ana Lyses (Tga-Dta),X-Ray Diffraction (Xrd) And Scanning Electron Microscopy (Sem). (C) 1998 Kluwer Academic Publishers.
Doi:10.1023/a:1004476701618

专利信息

专利号:US-3325254-A
优先权日:1963-07-29
标题:Synthesis of diamond
发明人：GIARDINI ARMANDO A; TYDINGS JOHN E
权利人:GIARDINI ARMANDO A; TYDINGS JOHN E

专利号:WO-2012040853-A1
优先权日:2010-09-28
标题:Group 5 metal complexes useful for amine functionalization and synthetic process for manufacture thereof
发明人：SCHAFER LAUREL L; LAUZON JEAN MICHEL P; AYINLA RASHIDAT O; EISENBERGER PATRICK
权利人:UNIV BRITISH COLUMBIA; SCHAFER LAUREL L; LAUZON JEAN MICHEL P; AYINLA RASHIDAT O; EISENBERGER PATRICK
摘要:The present invention provides Group 5 metal complexes useful for amine functionalization and synthetic process for manufacture thereof. Provided in this application are halo group 5 metal-amidate complexes having the structure of Formula I: I wherein: M is a group 5 metal, such as Ta, Nb or V; X is a halo substituent, such as CI, F, I or Br; n = 1 or 2,; s = 1 or 2; R 1 and R 2 are each independently H; a C 1 - C 25 substituted or unsubstituted, linear, branched or cyclic alkyl; or substituted or unsubstituted aryl or heterocyclic groups; R' is independently a C 1 - C 25 substituted or unsubstituted, linear, branched or cyclic alkyl; a substituted or unsubstituted aryl; a substituted or unsubstituted heterocyclic group; or NR 3 n 2 ; and each R 3 is independently a C 1 - C 25 substituted or unsubstituted, linear, branched or cyclic alkyl; a substituted or unsubstituted aryl; or substituted or unsubstituted heterocyclic group, and a process for synthesis thereof. Also provided are the corresponding metallaaziridine complexes. The metal complex of Formula I, and the corresponding metallaaziridine complex are useful as a catalysts in ct-alkylation of secondary amines and, therefore, also provided are methods of using the metal complex of Formula I, and the corresponding metallaaziridine complex in o-alkylation of secondary amines. This application also provides methods of using the corresponding non-halo group 5 metal-amidate complexes and metallaaziridine complexes in α-alkylation of heterocycles.