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- W2126393075 abstract "2,2-Difluor-1,3-diaza-2-sila-cyclopentene – Synthesis and Reactions N,N′-Di-tert-butyl-1,4-diaza-1,3-butadiene reacts with elemental lithium under reduction to give a dilithium salt, which forms with fluorosilanes the diazasilacyclopentenes 1–4; (HCNCMe3)2SiFR, R = F (1), Me (2), Me3C (3), N(CMe3)SiMe3 (4). As by-product in the synthesis of 1, the tert-butyl-amino-methylene-tert-butyliminomethine substituted compound 5 was isolated, R = N(CMe3)-CH2-CH = NCMe3. 5 is formed in the reaction of 1 with the monolithium salt of the 1,4-diaza-1,3-butadiene in an enamine-imine-tautomerism. 1 reacts with lithium amides to give (HCNCMe3)2SiFNHR, 6–12, R = H (6), Me (7), Me2CH (8), Me3C (9), H5C6 (10), 2,6-Me2C6H3 (11), 2,6-(Me2CH)2C6H3 (12). The reaction of 12 with LiNH-2.6-(Me2CH)2C6H3 leads to the formation of (HCNCMe3)2Si(NHR)2, (13). In the presence of n-BuLi, 12 forms a lithium salt which looses LiF in boiling toluene. Lithiated 12 adds this LiF and generates a spirocyclic tetramer with a central eight-membered LiF-ring (14), [(HCNCMe3)2Si(FLiFLiNR)]4, R = 2,6-(Me2CH)2C6H3. ClSiMe3 reacts with lithiated 12 to yield the substitution product (HCNCMe3)2SiFN(SiMe3) R, (15). The crystal structures of 1, 5, 6, 9, 11, 13, 14 are reported." @default.
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- W2126393075 date "2007-07-01" @default.
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- W2126393075 title "2,2-Difluor-1,3-diaza-2-sila-cyclopenten – Synthese und Reaktionen" @default.
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- W2126393075 doi "https://doi.org/10.1002/zaac.200700107" @default.
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