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- W4220753176 abstract "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 Ti[triple bond, length as m-dash]NR 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." @default.
- W4220753176 created "2022-04-03" @default.
- W4220753176 creator A5018953882 @default.
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- W4220753176 date "2022-01-01" @default.
- W4220753176 modified "2023-10-14" @default.
- W4220753176 title "α-Diimine synthesis <i>via</i> titanium-mediated multicomponent diimination of alkynes with C-nitrosos" @default.
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- W4220753176 doi "https://doi.org/10.1039/d1sc06111a" @default.
- W4220753176 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35222931" @default.
- W4220753176 hasPublicationYear "2022" @default.
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