5393-49-7Relevant articles and documents
α-Diimine synthesis via titanium-mediated multicomponent diimination of alkynes with C-nitrosos
Cheng, Yukun,Egger, Dominic T.,Frye, Connor W.,Kounalis, Errikos,Pearce, Adam J.,Tonks, Ian A.
, p. 1469 - 1477 (2022/02/11)
α-Diimines are commonly used as supporting ligands for a variety of transition metal-catalyzed processes, most notably in α-olefin polymerization. They are also precursors to valuable synthetic targets, such as chiral 1,2-diamines. Their synthesis is usually performed through acid-catalyzed condensation of amines with α-diketones. Despite the simplicity of this approach, accessing unsymmetrical α-diimines is challenging. Herein, we report the Ti-mediated intermolecular diimination of alkynes to afford a variety of symmetrical and unsymmetrical α-diimines through the reaction of diazatitanacyclohexadiene intermediates with C-nitrosos. These diazatitanacycles can be readily accessed in situ via the multicomponent coupling of TiNR imidos with alkynes and nitriles. The formation of α-diimines is achieved through formal [4 + 2]-cycloaddition of the C-nitroso to the Ti and γ-carbon of the diazatitanacyclohexadiene followed by two subsequent cycloreversion steps to eliminate nitrile and afford the α-diimine and a Ti oxo.
BIS-IMINE TITANIUM COMPLEX, CATALYTIC SYSTEM COMPRISING SAID BIS-IMINE TITANIUM COMPLEX AND PROCESS FOR THE (CO)POLYMERIZATION OF CONJUGATED DIENES
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Page/Page column 33; 34, (2019/04/26)
Bis-imine titanium complex having general formula (I): wherein: R1 and R2, mutually identical or different, represent a hydrogen atom; or are selected from linear or branched, optionally halogenated, C1-C20 alky
METHOD OF PRODUCING ORGANIC SILICON COMPOUND
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Paragraph 0032, (2017/03/23)
PROBLEM TO BE SOLVED: To provide a method of producing an organic silicon compound efficiently by improving a catalyst for hydrosilylation reactions of alkenes and alkynes. SOLUTION: An organic silicon compound can be produced efficiently by using an iron