Oskar Doebner

Oskar Gustav Doebner , also Oscar, (born November 20, 1850 in Meiningen , † March 28, 1907 in Marseille ) was a German chemist ( organic chemistry ). He was a professor at the University of Halle .

Life

He was the son of a senior building officer, attended the Bernhardinum high school in Meiningen (Abitur 1869 as Primus Omnium ) and studied natural sciences (especially botany) in Jena and Munich from 1869. After military service in the war in 1870/71, he continued his studies in Leipzig, where he concentrated on chemistry with Hermann Kolbe (after he had already heard Justus Liebig's lectures in Munich ). In 1872 he went to Tübingen, where he received his doctorate under Rudolf Fittig in 1873 (About Diphenyl). He was an assistant in Berlin, Braunschweig (with Robert Otto ) and from 1875 back in Berlin with August Wilhelm von Hofmann . In 1879 he completed his habilitation and became a private lecturer. In 1884 he became associate professor (for pharmacy, toxicology and forensic chemistry, successor to Ernst Schmidt), in 1893 head of department in the Institute of Chemistry and in 1899 full professor for chemistry and pharmacy in Halle. He died of a stroke while on vacation.

In 1878 he succeeded in synthesizing malachite green while studying the reactions of benzotrichloride to phenols and aromatic amines, independently of Otto Fischer (1877). This triphenylmethane dye made dark green synthetically accessible and was produced by Agfa (AG für Anilinfarbenfabrikation) according to his method for a few years until it was replaced by Otto Fischer's method. The parent substance of Doebner's malachite green was Doebner's violet .

The Doebner-Miller reaction for the synthesis of quinoline derivatives is named after him and his long-time colleague Wilhelm von Miller . Both worked on it together from 1881 to 1884. From this, Doebner developed the Doebner quinchoninic acid synthesis in 1887 and from it a detection reaction for aldehydes (Doebner reaction). In 1887 he was elected a member of the Leopoldina .

A variant of the Knoevenagel reaction is named after him.

literature

Pummerer, Rudolf: Doebner, Oskar Gustav. In: New German Biography (NDB). Volume 4, Duncker & Humblot, Berlin 1959, ISBN 3-428-00185-0 , p. 13 f. ( Digitized version ).
Entry in the lexicon of important chemists by Winfried R. Pötsch; Annelore Fischer; Wolfgang Müller. With the collaboration of Heinz Cassebaum. Thun, Harry Deutsch, Frankfurt am Main 1989, ISBN 3-8171-1055-3 .

Web links

Entry on Oskar Doebner in the Catalogus Professorum Halensis

Individual evidence

↑ Member entry of Oscar Gustav Doebner at the German Academy of Natural Scientists Leopoldina , accessed on November 13, 2015.
↑ O. Doebner: About the unsaturated acids homologous to sorbic acid with two double bonds , reports of the German chemical society , 1902 , 35 , pp. 1136–1147, doi : 10.1002 / cber.190203501187 .

personal data
SURNAME	Doebner, Oskar
ALTERNATIVE NAMES	Doebner, Oscar
BRIEF DESCRIPTION	German chemist
DATE OF BIRTH	November 20, 1850
PLACE OF BIRTH	Meiningen
DATE OF DEATH	March 28, 1907
Place of death	Marseille

[1] Member entry of Oscar Gustav Doebner at the German Academy of Natural Scientists Leopoldina , accessed on November 13, 2015.

[2] O. Doebner: About the unsaturated acids homologous to sorbic acid with two double bonds , reports of the German chemical society , 1902 , 35 , pp. 1136–1147, doi : 10.1002 / cber.190203501187 .