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- W2141199265 abstract "Summary The phenolic hydroxyl groups in the lignin model compounds, 2-methoxy-4-propylphenol and 4-hydroxy-3-methoxyacetophenone, were removed by first converting the hydroxyl groups to the trifluoromethanesulfonates (triflates) and then cleaving the triflate substituents via catalytic hydrogen transfer. The products, 1-methoxy-3-propylbenzene and 3-methoxyacetophenone, were characterized by 1 H and 13 C NMR, mass spectrometry and elemental analyses. The effect of the removal of the phenolic groups on the photostability of the model compounds was evaluated by impregnating the compounds into Whatman filter paper sheets, and subjecting them to an accelerated yellowing experiment in a UV chamber. The removal of the phenolic groups resulted in a significant yellowing inhibition, with a higher photostabilizing effect than methylation or acetylation of the hydroxyl, particularly for the model compound without an α-carbonyl group." @default.
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- W2141199265 date "2000-02-29" @default.
- W2141199265 modified "2023-10-17" @default.
- W2141199265 title "Removal of Phenolic Hydroxyl Groups in Lignin Model Compounds and Its Effect on Photostability" @default.
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- W2141199265 doi "https://doi.org/10.1515/hf.2000.022" @default.
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