Patents Assigned to MacFarian Smith Limited
  • Process for the preparation of 8-halodihydrocodeinone hydrohalides and codeine
    Patent number: 4140687
    Abstract: Compounds of the general formula ##STR1## in which X represents halogen. These compounds are useful in the production of codeinone and codeine substantially free from impurities.
    Type: Grant
    Filed: August 4, 1977
    Date of Patent: February 20, 1979
    Assignee: MacFarian Smith Limited
    Inventors: Edward L. Grew, Henry A. S. Payne