Mechanistic Investigations into the Brightness Stabilization Effects of Hexadienol
Titel:
Mechanistic Investigations into the Brightness Stabilization Effects of Hexadienol
Auteur:
Harvey, L. C. Ragauskas, A. J.
Verschenen in:
Journal of wood chemistry and technology
Paginering:
Jaargang 16 (1996) nr. 1 pagina's 79-93
Jaar:
1996
Inhoud:
The total amounts of 3,4,5-trimethoxyacetophenone and 2,6-dimethoxyphenol formed via the photocleavage of 3,4,5-trimethoxy-α-(2',6'-dimethoxyphenoxy)-acetophenone (1) in benzene and 3:2 ethanol/benzene, have been quantified in the presence and absence of 2,4-hexadienol, a potential photostabilizing agent for mechanical pulps. Photodegradation of 1 in ethanol/benzene solutions was shown to be reduced by the addition of hexadienol. Photolysis of bleached chemithermomechanical pulp (BCTMP) treated with trans,trans-2,4-hexadienol was shown to yield all four possible geometric isomers of the hexadienol. These results suggest that a potential mode of stabilization of mechanical pulps by the hexadienol is triplet quenching of the excited state of lignin chromophores such as the α-carbonyl groups of phenacyl aryl ethers.
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