Structure IV was supported by infrared4 spectra which showed the stretching frequencies character- istic of aromatic CH, C=C, Amide I, and Amide I1 (cf. Table I). The spectra showed one band in the resion 3246-3448 cm.-', probably due to an overlap of the OH and NH stretching frequencies. ... EXPERIMENTAL' A. Generul procedure for the reaction of ~-phenyl-6-oxazoEone6 (I) with arylmagnesium halides. To an ethereal solution of the arylmagnesium halide (3 ...