Born July 2, 1875, in Fürth, Bavaria; died Mar. 17,1939, in Geneva. Swiss organic chemist.
Ullmann studied in Lausanne. He worked and taught at the universities of Geneva and Berlin. Ullmann proposed dimethyl-sulfate as a methylating agent, carried out the condensation of phthalic anhydride with phenols in the presence of aluminum chloride, and developed a method of obtaining binuclear and polynuclear aromatic systems. He was the editor and author (in part) of a 12-volume encyclopedia of chemical technology (1915—23), subsequently reprinted as Ullmanns Encyklopadie der technischen Chemie (3rd ed., vols., 1-19,1951-70).