FIELD: petrochemistry. SUBSTANCE: invention is concerned with preparing 3,5-ditert-butyl-4-oxybenzaldehyde (DTBA) used as intermediate product for preparing pesticides, stabilizers to polymeric materials and petroleum products, 2,6-ditert-butylphenol is condensed with urotropin at 1:0.8-1.5 molar ratio in 90% acetic acid at weight ratio of acetic acid to 2,6-ditert-butylphenol of 1:2.5-3.2. The yield of DTBA is increased up to 95%. Reuse of acetic acid does not reduce the yield of the desired product. EFFECT: increased yield of DTBA and simplified process procedure.
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