Patents Examined by Bul A. Zucker
  • Phosgene-free process for preparing carbamates
    Patent number: 6528678
    Abstract: A phosgene-free method for preparing a carbamate from a compound containing an amine group involves reacting the compound with an alkylating agent in the presence of carbon dioxide and cesium carbonate. A reaction can take place under standard pressure and temperature conditions and produces carbamates in a high yield with low by-product formation.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: March 4, 2003
    Assignee: Pharmacia& Upjohn Company
    Inventor: Byung H. Lee