Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 77, Issue 7, Pages 3373-3380Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo300192n
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- University of Bologna (RFO)
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The syn and anti diastereoisomers of some 1,3,5-triarylisocyanurate derivatives were isolated and their configuration assigned by NOE experiments and by X-ray diffraction. The kinetics of the syn/anti interconversion were determined, and the experimental activation energies matched satisfactorily the values predicted by DFT computations. Low-temperature NMR spectra were employed to determine the rotation barrier of N-bonded unhindered aryl substituents: these barriers, too, are satisfactorily reproduced by DFT computations. In the case of racemic diastereoisomers, the two expected enantiomers (atropisomers) were isolated by enantioselective HPLC and the absolute configuration established by DFT simulation of the electronic and vibrational circular dichroism spectra.
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