METHOD FOR OBTAINING 5-NITROVANILLIN Russian patent published in 2023 - IPC C07C201/08 C07C205/44 

FIELD: organic chemistry.

SUBSTANCE: method for producing 5-nitrovanillin. The method consists in the interaction of vanillin with acetyl nitrate and is characterized by the fact that it is carried out without the use of chlorine-containing solvents. Vanillin is dissolved in an organic solvent - ethanol, acetyl nitrate obtained from concentrated nitric acid and acetic anhydride is added, the reaction mixture is kept for 30 minutes. After that, 5-nitrovanillin is precipitated with water, separated by vacuum filtration, washed with water and dried without heating to constant weight.

EFFECT: proposed method makes it possible to obtain high-purity 5-nitrovanillin with a high yield and a short duration of synthesis, as well as without the release of toxic nitrogen oxides.

1 cl, 1 tbl, 5 ex