Patents Assigned to Suddeutsche Zucker-Aktiengsellschaft
  • Dicyanoazulenyl and dicyanovinyl substituted furan
    Patent number: 5252757
    Abstract: A cycloadduct of the formula ##STR1## is prepared by reacting 2,2'-(2,5-furandiyldimethylidine)bis-propanedinitrile with 8-methoxypheptafulvene to form a tetrahydroazulene intermediate and then heating a solution of the tetrahydroazulene intermediate in a boiling solvent to drive off methanol.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: October 12, 1993
    Assignee: Suddeutsche Zucker-Aktiengsellschaft
    Inventors: Jorg Daub, Knut M. Rapp, Petra Seitz, Rainer Wild, Josef Salbeck