The reactivity of NbX5 (X = F, Cl) with lactons, lactams, and the synthesis of the first nucleobase-containing niobium complex |
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Authors: | Fabio Marchetti |
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Institution: | Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Risorgimento 35, I-56126 Pisa, Italy |
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Abstract: | NbX5 (X = F, 1a; X = Cl, 1b) reacted with γ-butyrolactone (but), ε-caprolactam (cap), δ-valerolactam (val) in 1:1 M ratio in chlorinated solvent, affording either the neutral coordination adducts NbCl5L (L = but, 2a; L = val, 2b) or the ionic ones NbX4L2]NbX6] (X = F, L = but, 3a; X = F, L = val, 3b; X = F, L = cap, 3c; X = Cl, L = cap, 3d). The reaction of 1a with equimolar amount of guanine (gua) in CH3CN resulted in the formation of the complex NbF4(gua)2]NbF6], 3e. The addition of two equivalents of organic substrate to 1 gave selectively the compounds NbCl5L2 (L = but, 4a; L = val, 4b) or NbF4L4]NbF6] (L = but, 5a; L = val, 5b; L = cap, 5c). The 1:2 M reaction of 1b with ε-caprolactam proceeded with C-N bond activation and afforded the derivative , 6, in high yield. |
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Keywords: | Niobium pentahalides Lactams Lactons Guanine Coordination adducts C-N activation |
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