Patents Assigned to Group SNPE
  • Monomethylation of nitrogeneous heterocycles
    Patent number: 7022845
    Abstract: A process for the monomethylation of nitrogenous heterocycles having at least one nitrogen atom bonded to a hydrogen atom by reacting the nitrogenous heterocycle with dimethyl carbonate at a temperature of between 100° and 200° C. and a pressure of between 0.93×105 Pa and 1.07×105 Pa while methanol produced during the reaction is distilled off as it is formed.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: April 4, 2006
    Assignee: Group SNPE
    Inventors: Elisabeth Borredon, Berhard Chabaud, Antoine Gaset, Sophie Thiebaud-Roux, Samedy Ouk