Rainer Ludwig Claisen
1920802
204616247
2008-04-10T03:41:17Z
Dassiebtekreuz
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'''Rainer Ludwig Claisen''' ([[January 14]], [[1851]] – [[January 5]], [[1930]]) was a famous [[Germany|German]] [[chemist]] best known for his work with condensations of [[carbonyl]]s and [[sigmatropic rearrangement]]s. He was born in [[Cologne]] as the son of a [[jurist]] and studied chemistry at the university of [[Bonn]] ([[1869]]), where he became a member of [[K.St.V. Arminia]]. He served in the [[army]] as a male nurse in [[1870]]-[[1871]] and continued his studies at [[Georg August University of Göttingen|Göttingen University]]. He returned to the [[University of Bonn]] in [[1872]] and started his [[academic]] career at the same university in [[1874]]. He died in [[1930]] in [[Godesberg am Rhein]] (near [[Bonn]]).
==Career==
'''Claisen's professional career:'''
{| {{wikitable}} width="100%"
|-
| style="text-align:center;width:10%;" | '''[[1874]]'''
| [[Doctorate|Promotion]] at the [[University of Bonn]]; position at [[Kekule|Kekulé's]] laboratory
|-
| style="text-align:center;width:10%;" | '''[[1878]]'''
| [[Habilitation]] as [[Privatdozent]] at the University of Bonn
|-
| style="text-align:center;width:10%;" | '''[[1882]]'''
| Worked with [[Henry Enfield Roscoe|Henry Roscoe]] and [[Carl Schorlemmer]] at [[Owens College]], [[Manchester]] (until [[1885]])
|-
| style="text-align:center;width:10%;" | '''[[1886]]'''
| Worked at the laboratory of [[Adolf von Baeyer|von Baeyer]] ([[University of Munich]])
|-
| style="text-align:center;width:10%;" | '''[[1887]]'''
| [[Habilitation]] as [[Privatdozent]] at the University of Munich
|-
| style="text-align:center;width:10%;" | '''[[1890]]'''
| Position as [[Professor|Professor ordinarius]] of [[organic chemistry]] at [[Technische Hochschule|TH]] [[Aachen]]
|-
| style="text-align:center;width:10%;" | '''[[1897]]'''
| Position as [[Professor|Professor ordinarius]] of [[chemistry]] at the [[University of Kiel]]
|-
| style="text-align:center;width:10%;" | '''[[1904]]'''
| [[Professor|Honorarprofessor]] at the [[University of Berlin]], collaboration with [[Emil Fischer]]
|-
| style="text-align:center;width:10%;" | '''[[1907]]'''
| [[Emeritus]]; starts his own private laboratory in [[Godesberg am Rhein]]
|}
'''Scientific contributions:'''
* Described the [[condensation]] of [[aromatic]] [[aldehyde]]s with [[aliphatic]] aldehydes or [[ketone]]s in [[1881]]. Today, this reaction is commonly referred to as the [[Claisen-Schmidt condensation]].
* Discovered ([[1887]]) the condensation reaction of an [[ester]] with an activated [[methylene|methylene group]], now known as the [[Claisen condensation]].
* Synthesis of [[cinnamate]]s by reacting aromatic aldehydes with esters. The reaction is known as the [[Claisen reaction]] and was described by Claisen for the first time in [[1890]].
* Discovered the thermally induced [[rearrangement]] of [[allyl]] [[phenyl]] [[ether]] in [[1912]]. He details its reaction mechanism in his last scientific publication ([[1925]]). In his honor, the reaction has been named the [[Claisen rearrangement]].
* Synthesis of [[isatin]] via a process known as the [[Claisen isatin synthesis]], described for the first time in [[1879]].
* Designer of a special distillation flask, now known as the [[Claisen flask]].
==See also==
*[[Claisen condensation]]
*[[Claisen flask]]
*[[Claisen isatin synthesis]]
*[[Claisen reaction]]
*[[Claisen rearrangement]]
*[[Claisen-Schmidt condensation]]
==References==
*W Pötsch. Lexikon bedeutender Chemiker (VEB Bibliographisches Institut Leipzig, 1989) (ISBN 3323001850)
{{DEFAULTSORT:Claisen, Rainer Ludwig}}
[[Category:1851 births]]
[[Category:1930 deaths]]
[[Category:German chemists]]
[[Category:University of Bonn alumni]]
[[Category:University of Bonn faculty]]
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