DEHYDRATION OF ALPHA-SUBSTITUTED CARBOXYLIC ACIDS IN PRESENCE OF WATER AT HIGH PRESSURE VALUES Russian patent published in 2019 - IPC C07C51/377 C07C57/04 C07C57/65 

FIELD: chemistry.

SUBSTANCE: method of producing methacrylic acid by dehydrating an alpha-substituted carboxylic acid of formula (1), where R₁ is CH₃; each of R₂, R₃ and R₄ represents H, consists in realization of reaction in presence of water and at pressure values making 40–1,000 bar.

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EFFECT: present invention describes a method of dehydrating alpha-substituted carboxylic acids in the presence of water at high pressure values, which avoids the formation of by-products.

6 cl, 4 tbl, 33 ex, 1 dwg