Rotational spectra and nuclear quadrupole coupling constants of 4- and 2-iodoimidazole

Conformational isomers oftrans-urocanic acid observed by rotational spectroscopy

“…[39][40][41] A tendency for the described experimental conditions to generate products of the fragmentation of precursors has been noted during recent studies of imidazole and pyrazole derivatives. 18,42,43 Godfrey et al…”

“…This suggests that proton exchange is not effective under the present experimental or sample preparation conditions, consistent with a previous observation of the spectrum of 4iodoimidazole. 43…”