Intermolecular <sup>2h</sup><i>J</i><sub>NN</sub> Coupling in Multiply Hydrogen-Bonded Ureidopyrimidinone Dimers in Solution
作者:Serge H. M. Söntjens、Marcel H. P. van Genderen、Rint P. Sijbesma
DOI:10.1021/jo034889o
日期:2003.11.1
15N-Labeled ureido-4[1H]-pyrimidinones 4a and 5a were synthesized in order to investigate hydrogen bonding in the strongly hydrogen-bonded dimers in solution with intermolecular (2h)J(NN) coupling. Both direct-detection (15)N NMR and one-dimensional (15)N INADEQUATE (for smaller scalar coupling constants) were employed to determine the coupling constants. For dimers of 4 in CDCl(3), a temperature-dependent