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Gewählte Publikation:

Bacher, M; Hosoya, T; Zwirchmayr, NS; Nomura, S; Gille, L; Dietz, T; Erata, T; Potthast, A; Vuorinen, T; Rosenau, T.
(2018): Cyclic peroxides as key intermediates in the degradation of cellulosic key chromophores by alkaline hydrogen peroxide: first direct proof by O-17 NMR
CELLULOSE. 2018; 25(6): 3197-3203. FullText FullText_BOKU

Abstract:
2,5-Dihydroxy-[1,4]-benzoquinone (DHBQ) and 5,8-dihydroxy-[1,4]-naphthoquinone (DHNQ) are two key chromophores which are almost ubiquitous in cellulosic materials. Their fate under conditions of alkaline peroxide bleaching (P stage) has been established previously, but the intermediacy of cyclic peroxides, which so far had only been postulated, remained an open issue. By means of O-17 NMR spectroscopy, additionally supported by other NMR techniques, it was demonstrated that both DHBQ and DHNQ form cyclic peroxides as primary intermediates in the reaction with hydrogen peroxide under alkaline conditions. These intermediates are subsequently further degraded to products already known. The experimental confirmation of the cyclic peroxides is an important step in the understanding of reaction mechanisms in pulp bleaching chemistry. [GRAPHICS] .
Autor/innen der BOKU Wien:
Bacher Markus
Hosoya Takashi
Potthast Antje
Rosenau Thomas
Zwirchmayr Nele Sophie
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Cellulose
Chromophores
Benzoquinone
Naphthoquinone
Cyclic peroxides
P stage
Pulp bleaching
O-17 NMR


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