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Concerning the Hydroxyazo‐Quinonehydrazone Equilibrium of a Trisazonaphthalene with an [18]annulene perimeter macrocyclic Aza compounds, III
Author(s) -
Skrabal Peter,
Steiger Jürg,
Zollinger Heinrich
Publication year - 1976
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19760590829
Subject(s) - annulene , chemistry , equilibrium constant , coupling constant , perimeter , dynamic equilibrium , stereochemistry , computational chemistry , geometry , physics , particle physics , mathematics
The hydroxyazo‐quinonehydrazone equilibrium of the cyclic triazonaphthalene 1 has been determined from the 1 H‐NMR. spectrum of the 15 N ‐labelled compound. The size of the coupling constant J 15 N, H demonstrates that the equilibrium of 1 with respect to the non‐cyclic reference compound 6 is shifted towards the hydroxyazo form by factors of at least 5.1 and 3.9 in DMSO and H 2 O, respectively.