FIELD: preparation of wood delignification catalyst. SUBSTANCE: 1,4,4a, 9a-tetrahydroanthraquinone is prepared by condensation of 1,4-naphtoquinone (resulting from phthalic anhydride production waste containing 93-95 % main substance and 0.1-5 % organic acids) with 1,3- butadiene at 20-25 C for 14-16 days in high-boiling organic solvent. Yield is 96-97 %. EFFECT: simplified method and utilization of production waste.
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