NMR and Quantum-Chemical Studies of Electrostatically Stabilized 1-(N,N-Substituted-aminiomethyl)spirobi [3-oxo(2,5-dioxa-1-silacyclopentan)]ates (ES-Silanates)
Heteroatom Chemistry
2015
Alons Lends,
E. Olszewska,
Sergejs Beļakovs,
N. Erchak,
E. Liepiņš
1-(N,N-substituted-aminiomethyl)spirobi[3-oxo(2,5-dioxa-1-silacyclopentan)]ates were investigated using NMR, X-ray, and quantum-chemical methods. The free activation parameters for the inversion of “ammonium-amine nitrogen” and the chirality change at the pentacoordinated silicon were determined by dynamic NMR spectroscopy. The latter proceeds via the dissociation of Si[BOND]O bonds. The results were confirmed by quantum-chemical calculations, the experimental observation of cross-peaks in 2D-EXSY NMR spectra, and the spirocycle exchange reactions. Transition pathways between the different diastereomers in solution were analyzed.
Atslēgas vārdi
1-(N,N-Substituted-aminiomethyl)spirobi [3-oxo(2,5-dioxa-1-silacyclopentan)]ates
DOI
10.1002/hc.21203
Hipersaite
http://onlinelibrary.wiley.com/doi/10.1002/hc.21203/abstract
Lends, A., Olszewska, E., Beļakovs, S., Erchak, N., Liepiņš, E. NMR and Quantum-Chemical Studies of Electrostatically Stabilized 1-(N,N-Substituted-aminiomethyl)spirobi [3-oxo(2,5-dioxa-1-silacyclopentan)]ates (ES-Silanates). Heteroatom Chemistry, 2015, Vol.26, No.1, 12.-28.lpp. e-ISSN 1098-1071. Pieejams: doi:10.1002/hc.21203
Publikācijas valoda
English (en)