Patents Examined by ames H. Reamer
  • Process for purifying macrocyclic ketones
    Patent number: 4335261
    Abstract: A macrocyclic ketone having a 15- to 17-membered ring is produced from an .alpha.,.omega.-long chain dicarboxylic acid ester by the Dieckmann condensation reaction, followed by hydrolysis/decarboxylation reaction and then purification. The macrocyclic ketone is purified by subjecting the ketone to steam distillation in the presence of a non-volatile base.
    Type: Grant
    Filed: June 17, 1981
    Date of Patent: June 15, 1982
    Assignee: Daicel Chemical Industries, Ltd.
    Inventor: Yoichiro Ueda