FIELD: chemistry.
SUBSTANCE: present invention relates to a method of producing high-purity, halogen-free o-phthalaldehyde, having gas chromatography (GC) purity >99.5% of area, which can be used as an intermediate compound in production of paint, optical clarifying agent, in biocidal industry or photography. The disclosed method comprises the following steps: a) hydrolysis of tetrahalo-o-xylene at temperature 155-160°C and pressure 2-5 bars to o-phthalaldehyde which is b) converted in an acidic alcohol solution at temperature ranging from 0°C to boiling point with a reflux condenser to the corresponding dialkoxyphthalane and further, c) acetal is decomposed via acid hydrolysis at pH ranging from >1.5 to 7, thereby obtaining highly pure, halogen-free o-phthalaldehyde.
EFFECT: efficient method of producing high-purity, halogen-free o-phthalaldehyde.
5 cl, 1 ex
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