LADENBURG, ALBERT

LADENBURG, ALBERT (1842–1911), German organic chemist. Born in Mannheim, Ladenburg became professor of chemistry at the University of Kiel in 1874, and from 1889 to 1909 was at the University of Breslau. His research established that the six hydrogen atoms of benzene were equivalent, determined the atomic weight of iodine, and the molecular weight of ozone. He worked on stereo-chemistry, alkaloids, and pyridine and its derivatives. Among Ladenburg's books were Handwoerterbuch der Chemie (13 vols., 1882–95); Vortraege ueber die Entwicklungsgeschichte der Chemie in den letzten 100 Jahren (1902, Lectures on the History of the Development of Chemistry Since the Time of Lavoisier, 1905); Die Entwicklung der Chemie in den letzten 20 Jahren (1900); and Lebenserinnerungen (1912). -BIBLIOGRAPHY: Berichte der deutschen chemischen Gesellschaft, 45 (1912), 3597–644. (Samuel Aaron Miller)