Étude structurale d'une imidazolylcétone l'isopropyl-1-phényl-2-diaza-1,3-one-6-bicyclo[3,3,0]octène-2

The solid state configuration of 1-isopropyl-2-phenyl-1,3-diaza-6-one-bicyclo[3.3.0]oct-2-ene was determined from X-ray diffraction data (a = 10.039(3) A; b = 8.683(3) A; c = 15.505(6) A; β = 90.72(9)°; P21/c;R = 0.047). This structure is compared to those of three other related (Δ-2)-imidazolines. Molecular structure in solution was investigated by 1H nuclear magnetic resonance spectroscopy. Results clearly indicate that the title compound has the same structure in the solid state as in solution. On the contrary, this configuration differs appreciably from those of other (Δ-2)-imidazolines considered in this report. Keywords: (Δ-2)-imidazolines, crystal structure, NMR, conformations.