Paul Jannasch

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Jannasch in Göttingen
Jannasch in Heidelberg

Paul Ehrhardt Jannasch (born October 2, 1841 in Deutsch-Ossig , † March 20, 1921 in Heidelberg ) was a German chemist ( organic chemistry , analytical chemistry ).

From 1863 Jannasch studied chemistry in Leipzig, Breslau, Greifswald and Halle. He was an assistant at the Agricultural Academy in Proskau and received his doctorate in Göttingen in 1869 . He became an assistant there, completed his habilitation in 1883 and went to Heidelberg University with his boss Victor Meyer in 1889. There he became associate professor and head of the analytical laboratory and in 1918 full professor (one year before his retirement).

He began in organic synthesis and in 1870, together with Rudolph Fittig, produced tetramethylbenzene , the first alkylated benzene solid at room temperature , called durol by them. Later he dealt with analytics and clarified, for example, the composition of topaz and tourmaline . He developed an oxidizing digestion of sulfide ores in a stream of oxygen and a digestion of silicates with anhydrous boric acid and introduced hydrogen peroxide into the analysis, e.g. B. for the separation of manganese - and chromium - cations .

In 1888 he was elected a member of the Leopoldina . In 1909 he became an extraordinary member of the Heidelberg Academy of Sciences .

He was the son of Johann Moritz Jannasch, landowner in Ober-Deutsch-Ossig, and father of Adolf Jannasch .

Publications

  • Practical Guide to Weight Analysis, Heidelberg 1896, 2nd ed. 1903; Reprinted by Nabu Press 2010

literature

Individual evidence

  1. ^ Member entry by Paul Ehrhardt Jannasch at the German Academy of Natural Scientists Leopoldina , accessed on November 29, 2016.
personal data
SURNAME Jannasch, Paul
ALTERNATIVE NAMES Jannasch, Paul Ehrhardt (full name)
BRIEF DESCRIPTION German chemist
DATE OF BIRTH October 2, 1841
PLACE OF BIRTH German Ossig
DATE OF DEATH March 20, 1921
Place of death Heidelberg