Table 4.

¹³C-NMR chemical shifts (ppm) of the carbonyl groups of NAH derivatives 1 and 2a–d.

cpd	Ring	Ortho group	δ C=O (ppm)
1	pyrimidine	Me	167.42
2a	pyrimidine	H	165.47
2b	pyrimidine	Et	169.75
2c	phenyl	Me	164.83
2d	phenyl	H	162.91