Abstract
Hinoki cypress (Chamaecyparis obtusa)-lignophenol (p-cresol type, LC1) has been directly synthesized from milled wood of Hinoki cypress through the phase-separation system, which was surface reaction of lignocellulosics between concentrated acid and phenol under mild conditions. As resulting Iignophenol has rich phenolic hydroxyl groups by grafted phenols, various derivatives were easily designed from lignophenol. Second phenolation for hydroxymethylated LCl (HM-LCl) by the phase-separation system were not carried out sufficiently because of aggregations in aqueous media such as acids. But with cellulose supports for HM-LCl, aggregations were physically restricted and reactions occurred on the surfaces of HM-LC1. Moreover sufficient reactions on un-reacted parts of HM-LC1 interacted with supports were also carried out after hydrolysis of celluloses. By these second phenolations of lignophenol with cellulose supports in acidic media, second phenolated LC (LC2) was obtained with high yield over 95 %. Using this technique, new developing molecular designs such as controls of network density keeping recycling switches are expected.
