Spectroscopic Analysis of IIIJ

All the main functional groups were characterized in IR spectra which showed normal stretching absorption bands indicating the existence of aromatic ring (1,465-1,509 cm ), P-O-C (1,036-1054 cm ) P-C (871-895 and 1,303 cm ), and C=0 (1,765-1,775 cm ). A strong absorption at 1,146-1,149 cm was identified to be the absorption of N-O in the isoxazole ring. The absorption band at 

140 accounted for the C-H stretching of the aromatic ring and 2,850-2,980 cm accounted for the C-H stretching of the CH3 and methylene group. A peak at 1,175-1,197 cm accounted for P=0 in phosphinates. Two strong peaks near 1,529 and 1,352 cm were the evidences of the NO2 stretching in IIIJ-6. 

The El mass spectra of some compounds such as IIIJ-8 gave very weak molecular ion peaks because of the facile cleavage of the C-Cl bond. Its fragmentation ions of the compound were consistent with the structure. In this series of compounds, the values of molecular ion peaks showed odd numbers except IIIJ-6 containing a NO2 group. 

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