Karl Dimroth

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Karl Dimroth (born August 18, 1910 in Bad Tölz ; † November 26, 1995 in Marburg ) was a German chemist and university professor.

Life

Signature of Karl Dimroth

Dimroth was born as the son of the Munich university professor for organic chemistry Otto Dimroth and his wife Aloysia. He had three siblings from his father's first marriage and four half-siblings from his second marriage, two of whom were also chemists.

In 1939 Karl Dimroth married Lotte Grussdorf, a chemical-technical assistant whom he had met in 1936 in Göttingen. This marriage resulted in five children.

During the Nazi regime , Dimroth was a member of the National Socialist Fliegerkorps (NSFK), the NS Teachers' Association (NSLB), the National Socialist German Lecturers Association (NSD), the Reich Air Protection Association (RLB), the National Socialist People's Welfare (NSV), the National Socialist Old Herren Association and in 1937 the National Socialist German Workers' Party (NSDAP).

Career

Due to his father's university career, Karl Dimroth attended elementary schools in Greifswald and Würzburg and later the Realgymnasium in Würzburg, where he passed his matriculation examination in 1930 . He then began studying chemistry at the universities of Würzburg , Munich and Göttingen .

After the second association examination (today: diploma examination) in the summer of 1934, he began a doctoral thesis in Göttingen with Nobel Prize winner Adolf Windaus On the Lumister , which he received in 1936 with the Dr. phil. completed. In 1941 Dimroth completed his habilitation with a thesis on synthetic experiments in the field of anti-rachitic vitamins and related substances at the University of Göttingen for the subject of organic and biological chemistry . A pioneering work from this time was a review article published in 1939 on UV spectroscopy and the constitution of organic compounds. In autumn 1949, after intermediate positions as senior assistant and extraordinary professor in Marburg (1944–1948; with Hans Meerwein ) and associate professor and department head in Tübingen (1949; with Georg Wittig ), he became professor of physiological chemistry and director of physiological chemistry Institute of the Medical Faculty in Marburg.

In October 1952, he finally took over the full chair of chemistry at the Philosophical Faculty of the University of Marburg as the successor to Hans Meerwein and was also appointed director of the Institute of Chemistry, an office he held until 1971.

After the dissolution of the five Marburg faculties due to the Hessian University Act of 1970 and the establishment of a chemistry department in 1971, he worked as a university professor in the chemistry department until his retirement in 1978. Until 1990, as an emeritus , he carried out research with postdocs and a laboratory assistant in the chemistry department, before retiring completely.

Of his more than 120 students (diploma students, doctoral students and postdocs), twelve have also become university teachers. Dimroth's successor in Marburg was Gernot Boche (* 1938; † 2011) from 1979 to 2001 .

Act

Dimroth worked in various chemical fields during his career. His work is recorded in scientific publications and begins with biochemical work that deals with the constitution, hydrolysis and biosynthesis of ribonucleic acids from yeast as well as the chemistry of phosphoric acid esters . After taking over the Chemical Institute, Dimroth published mainly organic-synthetic works, in particular on the chemistry of aromatic seven-ring systems ( benzazepines , 3-benzoxepine and benzthiazepines ), the (2 H ) - and (4 H ) - pyrans , 2,4,6-trisubstituted pyrylium salts as well as the λ 3 - and λ 5 -phosphorines ( phosphabenzenes ).

The novel nitromethane condensation of pyrylium salts to form nitrobenzenes , the production of 2,4,6-triarylphenoxyl radicals, the production of extremely solvatochromic pyridinium N -phenolate betaine dyes , and the synthesis of phosphamonomethine cyanine dyes and phosphabenzenes were of particular importance ; The latter are extraordinary compounds with formally three-bonded phosphorus atoms with the low coordination number 2.

The well-known Dimroth cooler , however, goes back to his father.

Publications (selection)

  • Karl Dimroth: Relationship between the absorption spectra in the ultraviolet and the constitution of organic compounds. In: Angewandte Chemie , 1939, 52 , pp. 545-556.
  • Karl Dimroth, L. Jaenicke, D. Heinzel: The cleavage of the pentosenucleic acid of yeast with lead hydroxide. In: Justus Liebigs Annalen der Chemie , 1950, 566 , pp. 206-210.
  • Karl Dimroth: About the influence of solvents on the color of organic compounds. Meeting reports of the Society for the Promotion of All Natural Sciences in Marburg , 1953, 76  (3), pp. 3–49. Verlag Elwert, Marburg; Chemisches Zentralblatt , 1954, p. 9481.
  • Karl Dimroth, G. Neubauer: 2,4,6-Triphenylphenoxyl, a new oxygen radical stabilized by mesomerism. In: Angewandte Chemie , 1957, 69 , p. 95.
  • Karl Dimroth: Aromatic compounds from pyrylium salts. In: Angewandte Chemie , 1960, 72 , pp. 331-342.
  • Karl Dimroth, C. Reichardt, T. Siepmann, F. Bohlmann: About pyridinium-N-phenol-betaines and their use to characterize the polarity of solvents. In: Justus Liebigs Annalen der Chemie , 1963, 661 , pp. 1–37.
  • Christian Reichardt, Karl Dimroth: Solvents and empirical parameters to characterize their polarity. In: Advances in Chemical Research , 1968, 11 , pp. 1–73.
  • Karl. Dimroth: Delocalized Phosphorus-Carbon Double Bonds. Phosphamethine-cyanines, λ3-Phosphorins and λ5-Phosphorins. In: Advances in Chemical Research , 1973, 38 , pp. 1–147.
  • Karl Dimroth: The λ5-Phosphorins. In: Accounts of Chemical Research , 1982, 15 , pp. 58-64.
  • Karl Dimroth: Arylated phenols, aroxyl radicals and aryloxenium ions. Syntheses and properties. In: Topics in Current Chemistry , 1985, 129. pp. 99-172.

literature

  • Christian Reichardt : Who is it? - Karl Dimroth. In: Nachr. Chem. Techn. 23, 1975, p. 362 ( doi : 10.1002 / nadc.19750231607 ).
  • Christian Reichardt: In Liebigs Ann./Recueil. 1997, pp. XXIII-XL ( doi : 10.1002 / jlac.199719970403 ).
  • Gernot Boche: Karl Dimroth (August 18, 1910 - November 26, 1995). In: Chemistry in Our Time. 30, 1996, p. 45.
  • L. Jaenicke: Karl Dimroth (August 18, 1910 - November 26, 1995). In: BIOspectrum. 1996 (2), p. 47.
  • Gerhard Aumüller et al. (Ed.): The Marburg Medical Faculty in the “Third Reich” (= Academia Marburgensis. Volume 8.). Saur, Munich 2001, ISBN 3-598-24570-X , p. 718.
  • Ute Deichmann : Escape, join in, forget - chemists and biochemists in the Nazi era. Wiley-VCH, Weinheim 2001, pp. 305, 440 and 512.

Web links

Individual evidence

  1. ^ Ernst Klee: Das Personenlexikon zum Third Reich , Frankfurt am Main 2007, p. 111
  2. ↑ since 1961: Siebold-Gymnasium Würzburg
  3. ↑ Life data, publications and academic family tree of Karl Dimroth at academictree.org, accessed on January 29, 2018.
  4. ↑ from 1966: Institute for Organic Chemistry
  5. ↑ Habilitation Dimroth students in alphabetical order (communicated by Chr.Richardt ): Hans Günter Aurich , Armin Berndt , Ferdinand Bohlmann , Manuel Constenla , Hartmut Follmann , Peter C. Heinrich , Lothar Jaenicke , Hartwig Perst , Christian Reichardt , Armin Schweig , Friedrich W. Steuber and Herbert Witzel
personal data
SURNAME Dimroth, Karl
BRIEF DESCRIPTION German chemist and university professor
DATE OF BIRTH August 18, 1910
PLACE OF BIRTH Bad Tölz
DATE OF DEATH November 26, 1995
Place of death Marburg