Group 15 amides structural data

The isoselenazole ring in unsubstituted 3-hydroxy-l-benzo-l,2-selenazole (26) and in its 7-azaanalog (27) exists in nonaromatic amide form such as in 28 or 29 (Scheme 4). The amide proton is easily exchanged, via potassium salt, by alkyl, acyl, or sulfonyl groups. The additional evidence for amide structure is based on spectral data. For example, the amide band nc=0 = 1646 cm 1 in the IR spectrum and the broad singlet at 9.34 ppm in the 11 NMR spectrum were observed for 29 [49-51],... 

Table 11 Structural data for group 2 bis[bis(trimethylsilyl)amides] and their adducts ...

The peptide structure of proteins is indicated by many lines of evidence hydrolysis of proteins by acids, bases, or enzymes yields peptides and finally amino acids there are bands in their infrared spectra characteristic of the amide group secondary structures based on the peptide linkage can be devised that exactly fit x-ray data. 

Fig. 3. Structural data on the amide group. The solid arrow indicates the direction of the amide group...

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