Adolf Claus
Adolf Carl Ludwig Claus (born June 6, 1838 in Kassel ; † May 4, 1900 in Horheim ) was a German chemist who was the first to propose a hexagonal structural formula with crossed valences for benzene .
Life
His parents were the Münzwardein Heinrich Claus and Charlotte, geb. Judge. His brother was the zoologist Carl Claus (1835-1899).
Claus attended high school in his hometown Kassel and initially studied medicine at the University of Marburg . In 1859 he became a member of the Corps Teutonia Marburg . He switched to chemistry as a student of Hermann Kolbe and received his doctorate as an academic student of Friedrich Wöhler . In 1867 he became associate professor and in 1876 full professor of chemistry and technology at the University of Freiburg im Breisgau , of which he was dean in 1881/82.
Claus conducted research in the field of heterocycles , mainly on quinoline derivatives and fused ring systems such as naphthalene , anthracene and phenanthrene . During the debate about the structure of benzene at the time, he first used a hexagonal structure of the molecule. In 1867 he proposed a diagonal formula in which the ring atoms also had bridge bonds:
In 1900 he died at the age of 60 on his estate in Horheim.
Fonts
- Theoretical considerations and their applications to the systematics of organic chemistry. Freiburg 1866.
- The main features of the modern theory of organic chemistry. Freiburg 1871.
literature
- Berthold Peter Anft: Claus, Adolf. In: New German Biography (NDB). Volume 3, Duncker & Humblot, Berlin 1957, ISBN 3-428-00184-2 , p. 268 f. ( Digitized version ).
- Adolf Karl Ludwig Claus , in: Badische Biographien . V. part . Heidelberg 1906, pp. 101-103 ( digitized version )
Web links
- University of Freiburg, inventory B 38, Philosophical Faculty, 1460–1935 (PDF file; 463 kB)
- Nekrolog von GN Vis: Adolf Claus In: Journal für Praktische Chemie 62 , 127-133 (1900) doi : 10.1002 / prac.19000620106
Individual evidence
- ↑ date of death according to Obituary May 4, 1900 Journal for Practical Chemistry 62 , 127-133 (1900) and Reports of the German Chemical Society 33 , 1421-1423 (1900).
- ^ Adolf Karl Ludwig Claus , in: Badische Biographien . V. part . Heidelberg 1906, pp. 101-103 ( digitized version ).
- ↑ Kösener Corps lists 1910, 166 , 374.
- ^ Wissenschaft-Online-Lexika: Entry on Adolf Karl Ludwig Claus in the Lexikon der Biologie. Retrieved June 20, 2009.
- ↑ Heinrich Hirzel, Heinrich Friedrich Gretschel, Gustav Martin miracle: Yearbook of inventions and advances in the fields of physics, chemistry and chemical technology, astronomy and meteorology. Volume 37, 1901.
personal data | |
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SURNAME | Claus, Adolf |
ALTERNATIVE NAMES | Claus, Adolph; Claus, Adolf Karl Ludwig |
BRIEF DESCRIPTION | German chemist |
DATE OF BIRTH | June 6, 1838 |
PLACE OF BIRTH | kassel |
DATE OF DEATH | May 4th 1900 |
Place of death | Horheim |