Robert Pschorr

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Robert Pschorr

Robert Franz Pschorr (born December 4, 1868 in Munich ; † February 23, 1930 ibid) was a German chemist. His specialty was organic chemistry.

Life

Robert Pschorr was born in Munich in 1868 as the youngest of four sons of the brewery owner Georg Pschorr II (1830-1894). He studied chemistry at the Ludwig Maximilians University in Munich and was reciprocated in the Corps Franconia Munich in 1889 . When he was inactive , he moved to the University of Zurich . At the University of Jena he was awarded a Dr. phil. PhD . His doctoral supervisor was Ludwig Knorr . In his doctoral thesis, Pschorr dealt with heterocycles , namely the pyrazoles , then with opium alkaloids . A trip around the world, which he undertook with Herbert von Meister in 1896 , interrupted his experimental work. After his return, Pschorr found the opportunity to conduct independent research in Emil Fischer's laboratory in Berlin. In 1899 Pschorr completed his habilitation in Berlin. In April of the same year he married Tilla Scherer.

Through the gradual breakdown of apomorphine and thebaine, Pschorr was able to document and interpret the mutual relationships of the fission products from both series. Pschorr worked since April 1914 as the successor to Carl Liebermann as Professor of Organic Chemistry at the Technical University of Charlottenburg . Shortly after the start of the First World War , Pschorr was appointed captain of the reserve a. D. of the Royal Bavarian 1st Field Artillery Regiment "Prinzregent Luitpold" . He moved as chief of the 4th infantry ammunition column from the III. Royal Bavarian Army Corps into the field. Characterized as a major on July 8, 1915 , he remained a soldier for four years. When he returned to the TH Charlottenburg as a university professor in 1920, he was elected rector . His most important academic student is Alexander Schönberg .

Scientific importance

obituary

In order to elucidate the isomerism of the phenanthrene and thereby the morphine , Pschorr endeavored to synthesize predictably linked phenanthrene derivatives. The Perkin reaction of ortho -nitrobenzaldehyde with sodium phenyl acetate (or a derivative) in the presence of acetic anhydride mainly produces cis -α-phenyl- o -nitro cinnamic acid , which is converted into the diazonium salt via the amine . This is finally converted into phenanthrene-9-carboxylic acid with elimination of nitrogen and hydrogen chloride, copper powder being used as a catalyst ( Pschorr cyclization ).

See also

Individual evidence

  1. ^ P. Duden: Robert Pschorr . Angew. Chemie 43 (1930), pp. 245-246. doi : 10.1002 / anie.19300431202
  2. Kösener Corpslisten 1960, 106/536
  3. Dissertation: About some new derivatives of 1-phenyl-3-methylpyrazolone and antipyrine .
  4. Rector's speeches (HKM)
  5. ^ Louis F. Fieser and Mary Fieser: Organic Chemistry , 2nd Edition, Verlag Chemie, Weinheim (1968), p. 885 there.