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Quercetin pentaacetate (Qu(OAc)5) was obtained by the acylation of quercetin by method (5) and then reduced with sodium metal in ethanol. The features of the electronic structure of the quercetin pentaacetate reduction product were studied by analyzing the ESR spectra of ketyl resulting from the dissociation of the corresponding pinacolate. Figure 1 shows the ESR spectrum of the sodium ketyl of acetylated quercetin. The calculation of the spin density distribution using the Priroda software allowed us to assign a doublet with а Н = 2 G in the spectrum of quercetin ketyl to the

A topical trend in the industrial and ecological development of Russia is elaboration of the methods for integrated use of all components of natural raw materials, in particular, woodbased biomass. Note that the integrated processing of the woodbased bio� mass is possible only in close cooperation of various woodbased industries. These include production of traditional materials, energy sources, chemical prod� ucts, and biologically active compounds approaching the geochemically and energetically closed cycle tech� nology. Currently, all woodbased industries related to either mechanical or chemical processing of wood produce specific wastes although in different amounts. The difficulty of targeted standardized processing of these wastes is related to the necessity of strict indus� trial classification of the wastes and their averaging taking into account the physicochemical properties of the substances that form the material and parts of the trees. It is important that bulky wastes of woodbased biomass are formed upon extraction from wood of bio� logically active compounds such as terpenes, polypre� nols, and flavonoids, which are usually present in small amounts in the initial raw material (1). For example, the larch wood remainders after the removal of arabinogalactan and dihydroquercetin are large� scale wastes, their weight being about 85% of the wood weight (2, 3). A promising method for waste wood recycling is the production of plate materials without or with mini� mized use of synthetic binders. This trend is promising as regards the environmental safety of constructional materials. It was proposed to manufacture plate mate� rials from the compression molding material resulting from the extensive physicomechanical modification of wood by explosive autohydrolysis occurring at elevated