Carbodiimides 2, obtained from aza-Wittig reaction of vinyliminophosphoranes (1) with aromatic isocyanates, reacted with ROH in the presence of catalytic amount of sodium alkoxide to give new 2- alkoxy-4//-imidazolin-4-ones (3). The conditions for cyclization and the fungicidal activities of the new heterocycles synthesized were optimized. The results showed that some of the compounds exhibited good fungicidal activities. The best one was compound 3b, which exhibited more than 81% inhibition of Pellkularia sasakii and Physalospora piricola at 50 mg/L.

Key words: IMIDAZOLONE P, ISOCYANATE P, IMINE, ALCOHOL, FUNGICIDES, DEPRESSING