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- W1986471570 abstract "Die 14/15N- sowie 11B-NMR-Daten von Trifluormethylthioaminoboranen des Typs XnB[N(SCF3)2]3−n (X = F, Cl, Br, N3, NHSCF3; n = 0–2) und Cl3−nB(NHSCF3)n (n = 1 bis 3), sowie von einem Amin-Boran Me3N · BX2Y (X = Cl, Y = N(SCF3)2) und Cycloborazin [CF3SNHBNH]3 werden mitgeteilt. Mit Hilfe dieser Daten und einer qualitativen Analyse der Bindungsverhaltnisse anhand beobachteter Rotationsbarrieren und bekannter Strukturen wird die BN-Ruckbindung in diesen Verbindungen analysiert. Die im Vergleich zu Alkylaminoboranen geringen Anderungen in δ14/15N sowie die grosen Anderungen in δ11B werden auf geringe Ruckbindungsbeitrage zuruckgefuhrt. Daruber hinaus wird dadurch die „Halogenahnlichkeit” des (CF3S)2N-Restes bestatigt. Fur die Reihen X2BN(SCF3)2 (X = F, Cl, Br, N3), XB[N(SCF3)2]2 (X = Cl, Br, N3, N(SCF3)2) und Cln−3B(NHSCF3)n (n = 1–3) ergibt sich fur δ11B und δ14/15N eine lineare Beziehung. Es wird weiterhin gezeigt, das bisher bekannte δ14/15N/11B-Korrelationen fur den Fall starker BN-Ruckbindung gelten.14/15N N.M.R. and 11B N.M.R. Data of Trifluoromethylthioamino-boranes with Natural Isotope Abundance (Part 2)14/15N as well as 11B-NMR data for trifluoromethylthioabminoboranes of the types XnB[N(SCF3)2], with X = F, Cl, Br, N3, or NHSCF3, n = 0, 1 or 2, and Cl3−nB(NHSCF3)n with n = 1, 2 or 3, as well as for the amine-borne Me3NBCl2N(SCF3)2 and the cyclic borazene (CF3SNHBNH)3 are reported.These data are used, together with a qualitative analysis of the bonding situation based on observed rotational barriers and known structures, to analyse for B N back donation in these compounds. Relatively small variations in δ14/15N compared to those observed for alkylaminoboranes as well as large variations in δ11B are suggestive of small contributions only from back bonding. In addition the „halogene like” nature of the (CF3S)2N group is confirmed. For the series X2BN(SCF3)2 (X = F, Cl, Br on N3), XB[N(SCF3)2]2 (X = Cl, Br, N3 or N(SCF3)2) and Cln−3B(NHSCF3)n (n = 1, 2 or 3) a linear relationship for δ11B and δ14/15N is observed.It is furtheron demonstrated that hitherto known δ14/15N/11B correlations are valid only in case of strong B N back donation." @default.
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- W1986471570 date "1988-05-01" @default.
- W1986471570 modified "2023-09-27" @default.
- W1986471570 title "14/15N-NMR und11B-NMR-Daten von Trifluormethylthioaminoboranen mit nat�rlicher Isotopenh�ufigkeit" @default.
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- W1986471570 doi "https://doi.org/10.1002/zaac.19885600121" @default.
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