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- W4254719074 abstract "Among eleven components of extractives from the heartwoods of sugi (Cryptomeria japonica)shown in Figure 3, dehydroferruginol and xanthoperol in addition to ferruginol were found to be responsible for lowering the brightness of sugi BKP.By the chlorine treatment as the first stage of a multi-stage bleaching, ferruginol (a) converts to 11-chloroferruginol (c), dehydroferruginol (e), 11-chloro-7-hydroxyferruginol (i), and 6α, 11- dichloro-7 β-hydroxyferruginol (g). The latter four (c, e, i, g) as the intermediate compounds in the multi-stage bleaching were shown to afford undesirable effect on the final properties of sugi BKP. Amog the four compounds, the former two (c, e) are the major products at ten minutes after chlorination started, and then the latter two (i, g) follow. One of the reactions occurred at the early stage of chlorination of ferruginol (a), therefore, is formation of the compound (e) via the quinonemethide (q). Conversion to 11-chloroferruginol, on the other hand. is followed by reactions via the corresponding quinonemethide (r). Considering the results mentioned above and those obtained by the direct treatment of dehydroferruginol (e) with chlorine, the whole reaction pathways can be postulated as shown in Figure 11." @default.
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- W4254719074 date "1983-01-01" @default.
- W4254719074 modified "2023-09-26" @default.
- W4254719074 doi "https://doi.org/10.2524/jtappij.37.10_921" @default.
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