Reactant Having -c(=x)-, Wherein X Is Chalcogen Patents (Class 558/126)
  • Process for the continuous production of 2-phosphone-butane-1,2,4-tricarboxylic acid and alkali metal salts thereof
    Patent number: 4931586
    Abstract: This invention relates to an improved process for the continuous production of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and alkali metal salts thereof, in which dialkylphosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, are reacted in the presence of a basic catalyst to form phosphonosuccinic acid tetraalkyl ester, the ester thus obtained is directly reacted with alkyl-acrylate, in the presence of an alkaline catalyst and the reaction product thus obtained is directly hydrolyzed to PBTC or alkali metal salts thereof.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: June 5, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Roland Kleinstuck, Cornelia Lensch, Michael Immenkeppel, Hans-Dieter Block, Herbert Odenbach