Silyl nitronates nitroso acetal functionalization

The nitroso acetals that result from the [3 + 2] cycloaddition of alkyl nitronates with dipolarophiles typically provide several characteristic spectroscopic signals for identification. As in the silyl counterparts, the O—N—O stretch in the alkyl nitroso acetals is observed in the IR ranges between 1000 and 1030 cm (Tables 2.22 and 2.23) (57,75-77). However, this resonance is usually not strong, and can be obscured by other functional group resonances with more substituted nitroso acetals. 

---