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1H NMR discrimination of methylene protons in piperazine P-1 linkers of compounds D-N<P>NH, 4, 7a, 7b, 8 and 9.
| Methylene locations |
Compound δH (ppm) (500 MHz, DMSO-d6, 298 K) |
|||||
| D-N<P>NH | 4 | 7a | 7ba | 8a | 9a | |
| α-to Nsp3 | 3.13 | – | – | 3.09 | 2.97 | 3.15 |
| α-to Nsp2 | 3.91 | 3.80 | 3.78 | 3.78 | 3.78 | 3.78 |
aDownfield shifted resonances (Δδ as +0.25 and +0.33 ppm) of α-CH2 protons to –NH3+ group were reported in the case of some G-2 PAMAM dendrimers obtained by –COOH/H2N– neutralisation (CDCl3) [63].
