Nitrogen functional groups containing, 31 Table

Frequently the chemical shifts (Table 2.3) of molecular fragments and functional groups containing nitrogen complement their H and C shifts. The ammonia scale of N shifts used in... 

Frequently the chemical shifts (Table 2.3) of molecular fragments and functional groups containing nitrogen complement their 77and C shifts. The ammonia scale of N shifts used in Table 2.3 shows very obvious parallels with the TMS scale of C shifts. Thus, the N shifts (Table 2.3) decrease in size in the sequence nitroso, nitro, imino, amino, following the corresponding behaviour of the C shifts of carbonyl, carboxy, alkenyl and alkyl carbon atoms (Table 2.2). 

Table 3. Name and structure of organic functional groups containing nitrogen and oxygen.

The functional groups — NFU, —NO and —NO2 contain atoms which have the following naturally occurring NMR active nucleides 1H, 2H, 14N, 15N and 170. Table 1 lists some of their basic NMR characteristics as well as those of the 13 C isotope of the carbon atom, which is invariably one of the atoms normally attached to nitrogen in the compounds discussed in this book. 

Table 2.5 Some Important Nitrogen-Containing Functional Groups Present in Anthropogenic Organic Compounds...

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