Vibrational Spectra of Indazole

Five‐Membered Heterocycles: 1,2‐Azoles. Part 1. Pyrazoles

“…Note that the 15 N chemical shifts are very sensitive to hydrogen bonds and, obviously, to protonation. ) 3524 (n NH gas) [4] Source: [11] X-ray (CSD) [12] PYRZOL INDAZL 1 H NMR Source: [13] Source: [13,14] 13 C NMR Source: [15] Source: [16] 15 N NMR Source: [17] Source: [ Source: [22] Source: [23] Best theoretical calculations Source: [24] Source: [25] Aromaticity (benzene ¼ 0.991) 0.900: [26] 0.808: [26] a) a) Naphthalene: 0.811, 2H-indazole: 0.792 (using as criteria the HOMA) [27]. 111.9 NMR information on the non-aromatic derivatives of pyrazoles is very abundant, particularly on D 2 -pyrazolines and on pyrazolones [4,7].…”