Carboxyl Bonded Directly To Naphthylene Ring System Patents (Class 562/467)
  • Process for the manufacture of 2-alkoxy-6-bromo-naphthalenes
    Patent number: 4137272
    Abstract: A new process, which can be carried out on the technical scale, had been found for the preparation of 2-alkoxy-6-bromo-naphthalenes, especially suitable as starting compounds for the synthesis of estrogens, which comprises brominating 2-hydroxy-naphthalene-1-carboxylic acid with bromine, decarboxylating the 6-bromo-2-hydroxynaphthalene-1-carboxylic acid by heating the reaction mixture at 100 - 125.degree. C, and alkylating the 6-bromo-2-hydroxy-naphthalene formed. The process can be conducted easily and with high yields.
    Type: Grant
    Filed: April 28, 1977
    Date of Patent: January 30, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Theodor Papenfuhs, Kurt Gengnagel