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• W2001583886 abstract "Drei verschiedenartige Austauschprozesse sind in der Titelverbindung 1, die einen 5-gliedrigen 1,3,2-Oxazaborolidin-Chelatring enthält, 1H- und 13C-NMR-spektroskopisch nachweisbar. Die entsprechenden freien Aktivierungsenthalpien ΔG≠ wurden aus der Temperaturabhängigkeit der Signalformen bestimmt: A) Der Austausch der Protonen von Hydroxy- und Aminogruppe erfordert eine nur aus dem 1H-Spektrum abschätzbare freie Aktivierungsenthalpie von 13.7 ± 0.5 kcal/mol. B) Die Stickstoffinversion kann an 1H-Signalen der Ethylengruppen und an 13C-Signalen der Phenylringe verfolgt werden (Barriere 12.6 ± 0.3 kcal/mol). C) Der Ligandenaustausch, d. h. die Öffnung des Oxazaborolidinringes und der Ringschluß mit der Hydroxyethylgruppe, wurde an 1H- und 13C-Signalen der Ethylengruppen ausgewertet (Barriere 14.7 ± 0.3 kcal mol). Die Interpretation der kinetischen Daten führt zu dem Schluß, daß die BN-Bindungsspaltung für die beobachtete Barriere der Stickstoffinversion verantwortlich ist. Detection of Intramolecular Mobility by NMR Spectroscopy, XXX. Simultaneous Observation of Three Reversible Exchange Processes in Diphenylborinic Acid Diethanolamine Ester — A 1H and 13C DNMR Spectroscopic Investigation Three different exchange processes are observed by 1H and 13C NMR spectroscopy in the title compound 1, which contains a five-membered chelate ring. The corresponding free enthalpies of activation (ΔG≠) were determined by line shape studies at different temperatures: A) The exchange of the protons of the amino and hydroxy group, which is only observable in the 1H NMR spectra, requires a free enthalpy of activation of 13.7 ± 0.5 kcal/mol. B) The nitrogen inversion barrier was determined from the 1H NMR signals of the ethylene groups as well as the 13C NMR signals of the phenyl rings (barrier 12.6 ± 0.3 kcal/mol). C) The barrier of the ligand exchange — opening of the 1,3,2-oxazaborolidine ring and ring closure of the hydroxyethyl group — was determined from the 1H and 13C NMR signals of the ethylene groups (barrier 14.7 ± 0.3 kcal mol). The interpretation of the kinetic data leads to the conclusion that the BN bond cleavage is responsible for the observed nitrogen inversion rate." @default.
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• W2001583886 title "Nachweis innermolekularer Beweglichkeit durch NMR‐Spektroskopie, XXX. Simultane Beobachtung dreier reversibler Austauschprozesse im Diphenylborinsäure‐diethanolaminester — eine ¹ H‐ und ¹³ C‐DNMR‐spektroskopische Untersuchung" @default.
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• W2001583886 doi "https://doi.org/10.1002/cber.19781110716" @default.
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