Pseudosindora palustris

Based on the results mentioned above, an investigation using lauryl alcohol as phenol carrier was undertaken to discover the active phenols remaining in the wood of Pseudosindora palustris. Besides methyl 77-coumarate, five phenols -methyl ferulate, butein (12) (Fig. 9.3.4), pseudosindorin, sulfuretin, and rengasin - were isolated as those responsible for the colored specks. Two cinnamates, two chalcones, and two aurones all have a common skeleton of phenyl-a,)8-unsaturat-ed-y-carbonyl or methoxycarbonyl group in the molecules (171). 

Rengasin (19, Fig. 9.4.5) is not only one of the active phenols in sepetir-paya (Pseudosindora palustris) wood but also the sole component responsible for the colored specks in bleached rengas (Gluta and Melanorrhorea spp.) pulps. As with the other specks, these can also be reduced by application of phase-transfer catalysts at the alkaline extraction stage E2 (123). 

Based on the above results, the neutral extractives of sepetir-paya wood (Pseudosindora palustris) were divided into five fractions ) n- and /50-alkanes,... 

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