15N NMR study of azo-hydrazone tautomerism of some water-soluble dyes
1989; Elsevier BV; Volume: 11; Issue: 3 Linguagem: Inglês
10.1016/0143-7208(89)80002-6
ISSN1873-3743
AutoresKiyoshi Yamamoto, Kiyoshi Nakai, Toshio Kawaguchi,
Tópico(s)Synthesis and Characterization of Heterocyclic Compounds
ResumoThe 15N NMR spectra of some water-soluble dyes and their intermediates were measured in natural abundance. Azo dyes derived by coupling to analogues of α-naphthol were found to exist in the hydrazone form, whereas dyes obtained by coupling to analogues of naphthylamine existed in the azo form. Within the range of dyes investigated, the azo-hydrazone tautomerism is concluded to depend on the structure of the coupling components.
Referência(s)