“…0.46/0.25 ppm for 1 H, 4.47/2.09 ppm for 13 C, 7.0/3.28 ppm for 15 N, 9.85/6.92 ppm for 31 P, 4.31/2.08 ppm for 19 F, and 4.67/3.13 ppm for 29 Si, calculated on the CCSD or (/) DFT(B97-2) equilibrium geometries, respectively. These are very considerable numbers, given that the best contemporary accuracy of the NMR chemical shift calculations can be characterized by absolute deviations from the experiment of about 0.3–0.5 ppm for 1 H, − 1–2 ppm for 13 C, − 5–6 ppm for 15 N, , 4–5 ppm for 31 P, ,, 1–5 ppm for 19 F, , and 5–7 ppm for 29 Si. , …”