MUMBAI, India, Oct. 11 -- Intellectual Property India has published a patent application (202517071986 A) filed by Bayer Aktiengesellschaft, Leverkusen, Germany, on July 29, for 'method for producing methyl-4-isocyanatosulfonyl-5-methyl-thiophene-3-carboxylate.'
Inventor(s) include Arlt, Alexander; Geller, Thomas; and Brohm, Dirk.
The application for the patent was published on Oct. 10, under issue no. 41/2025.
According to the abstract released by the Intellectual Property India: "The invention relates to a method for producing methyl-4-isocyanatosulfonyl-5-methyl-thiophene-3-carboxylate of formula (I) by reacting methyl-4-(aminosulfonyl)-5-methylthiophene-3-carboxylate of formula (II) with diphosgene or triphosgene in the presence of one or more solvents and a catalyst, wherein, with respect to diphosgene, the molar ratio of the methyl-4-(aminosulfonyl)-5-methylthiophene-3-carboxylate of formula (II) to diphosgene is in the range of 1.0 : 0.5 to 1.0 : 2.25; or, with respect to triphosgene, the molar ratio of the methyl-4-(aminosulfonyl)-5-methylthiophene-3-carboxylate of formula (II) to triphosgene is in the range of 1.0 : 0.333 to 1.0 : 1.5; and the molar ratio of the methyl-4-(aminosulfonyl)-5-methylthiophene-3-carboxylate of formula (II) to the catalyst is in the range of 1.0 : 0.01 to 1.0 : 2.0."
The patent application was internationally filed on Mar. 25, 2024, under International application No.PCT/EP2024/057902.
Disclaimer: Curated by HT Syndication.
