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• W2336862615 endingPage "1581" @default.
• W2336862615 startingPage "1573" @default.
• W2336862615 abstract "The dinuclear tantalum–alkyne complexes [(η2-RC≡CR)TaCl2]2(μ-OMe)2(μ-thf) (2a, R = Et; 2b, R = nPr) were synthesized by treating the mononuclear tantalum–alkyne complexes (η2-RC≡CR)TaCl3(dme) (1a, R = Et; 1b, R = nPr) with 1 equiv of NaOMe in THF. We found that adding a catalytic amount (20 mol %) of 3-hexyne to 2a induced the spontaneous formation of Ta2Cl4(OMe)2(μ-C4Et4)(thf) (4a). Similarly, Ta2Cl4(OMe)2(μ-C4nPr4)(thf) (4b) was obtained by treatment of 2b with a catalytic amount (20 mol %) of 4-octyne. Reaction of 4a,b with 4-dimethylaminopyridine gave 4-dimethylaminopyridine-coordinated complexes 6a,b, whose structures were elucidated by the X-ray structure of 6a. We conducted a control experiment in which 10 equiv of 4-octyne was added to 2a to give Ta2Cl4(OMe)2(μ-C4-2,3-nPr2-4,5-Et2)(thf) (7) in 90% yield, indicating that free 4-octyne reacted with the tantalacyclopropene moiety of 2a to form a dissymmetric tantalacyclopentadiene, followed by the release of 3-hexyne. The catalytic activity of 4a–6a for [2 + 2 + 2] cyclotrimerization of 3-hexyne was examined, and we found that their activities were in the order 5a > 4a ≫ 6a." @default.
• W2336862615 created "2016-06-24" @default.
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• W2336862615 date "2016-04-19" @default.
• W2336862615 modified "2023-10-17" @default.
• W2336862615 title "Alkyne-Induced Facile C–C Bond Formation of Two η²-Alkynes on Dinuclear Tantalum Bis(alkyne) Complexes To Give Dinuclear Tantalacyclopentadienes" @default.
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• W2336862615 doi "https://doi.org/10.1021/acs.organomet.6b00182" @default.
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