Klaus Praefcke

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Klaus Praefcke (2006)

Klaus Praefcke (born January 3, 1933 in Ostseebad Wustrow / Fischland Mecklenburg , † November 20, 2013 in Berlin ) was a German chemist and professor in the field of organic chemistry .

Life

Klaus Praefcke grew up in the Ostseebad Kühlungsborn . After graduating from high school in July 1952 at the Friderico-Francisceum in Bad Doberan, Praefcke first studied history at the Humboldt University in Berlin . From 1954 to 1963 he studied chemistry at the Technical University of Berlin . He did his doctoral thesis in the field of organic chemistry. As an academic student of Horst Baganz, he was awarded a Dr.-Ing. PhD . He then did research in Alexander Schönberg's private laboratory at the TU Berlin. In 1970 he completed his habilitation there. Between 1971 and 1998 Praefcke worked as a professor for organic chemistry at the TU Berlin.

Praefcke was visiting professor at various universities and maintained research collaborations with well-known foreign academic institutions (selection: Egypt, Great Britain, India, Israel, Japan, Kuwait, New Zealand, North and South America, Russia and Turkey). Praefcke declined a call to the chair of organic chemistry at Tromsø University (Norway).

He was married and had a daughter and a son.

Klaus Praefcke died on November 20, 2013 at the age of 80 in Berlin. The funeral service and burial took place on December 2, 2013 at the state-owned cemetery Heerstraße in Berlin-Westend .

Act

His more than 300 scientific papers are mainly to be assigned to organic-chemical synthesis. Among other things, he has worked on aliphatic diazo compounds, preparative organic photochemistry , synthesis of metallo [Pd, Pt] macrocarbocycles, inositol and carbohydrate chemistry. In the last years of his scientific research he was mainly concerned with the chemistry and physics of liquid crystals . He was the first to synthesize several substance classes of liquid-crystalline substances.

From the Ivanovo State University , Russia, he was awarded an honorary professorship in 1993 for his contributions to the chemistry and physics of liquid crystals .

Since 1973 Praefcke has built up an extensive collection of contemporary history on the subject of "Jews and the Middle East in (the) caricature" with around 4,500 items. In addition, he devoted himself to studies and photo documentation on the history of decorative, historical and handicraft treasures and monuments in the native Baltic Sea resort of Kühlungsborn and the surrounding area (Mecklenburg-Western Pomerania), this was documented in 2006 in an exhibition of the Kunstverein in the Baltic Sea resort of Kühlungsborn.

literature

Individual evidence

  1. ^ (A) Siegfried Akkermann : Jenseits von Riga , Godewind Verlag, 2005, pages 386–388, ISBN 3-938347-70-8 ; (b) Siegfried Akkermann: Kühlungsborner Bilderbogen & Rostocker Allerlei , Godewind Verlag, pages 38 ff and Fig. 1, 3 and 8 (1949), ISBN 978-3-939198-05-5 .
  2. Life data, publications and academic family tree of Klaus Praefcke at academictree.org, accessed on January 1, 2018.
  3. Life data, publications and academic family tree of Klaus Praefcke at academictree.org, accessed on January 1, 2018.
  4. ↑ Obituary notice of the family on the website of the Institute for Chemistry at the TU Berlin (www.chemie.tu-berlin.de). Retrieved December 11, 2019.
  5. (a) J. Martens and K. Praefcke: Organic Sulfur Compounds VII: Photochemical α-cleavage of thiobenzoic acid-Sp-tolylesters in solution , Chemical Reports 107 (1974) 2319; (b) G. Buchholz, J. Martens and K. Praefcke: 2- and 4-azathioxanthones by photo rearrangement of thionicotinic acid S-aryl esters , Angewandte Chemie 86 (1974) 562; Angewandte Chemie International Edition in English 13 (1974) 550; (c) G. Buchholz, J. Martens and K. Praefcke: Photochemical thioxanthone synthesis from halothiobenzoic acid S-aryl esters , Synthesis 1974 , 666; (d) J. Martens, K. Praefcke and H. Schwarz: Organic sulfur compounds VI: Thioxanthone synthesis by photo rearrangement of diaryl-α-ketosulfides (thiol esters), a new light-induced aromatic substitution reaction , Tetrahedron 30 (1974) 2565; (e) G. Buchholz, J. Martens and K. Praefcke: Organic Photochemistry VII: Photosubstitution of 1-Halogenthioxanthonen , Tetrahedron Letters 1975 , 3213; (f) J. Martens, K. Praefcke and U. Schulze: Intramolecular Photo-Friedel-Crafts reactions; a new synthetic principle for heterocycles , Synthesis 1976 , 532; (g) Jürgen Martens, Klaus Praefcke and Helmut Simon: Photochemistry of Selenol Esters. In: Journal of Nature Research B . 31, 1976, pp. 1717-1718 ( PDF , free full text). ; (h) R. Lüdersdorf, J. Martens, B. Pakzad and K. Praefcke, Organic Photochemistry XIV: Photoreactions of sulfinyl-substituted carboxylic acid, thiocarboxylic acid and selenocarboxylic acid derivatives in solution; light-induced acid cleavage, heterocycle formation and photosubstitution , Liebigs Annalen der Chemie 1977 , 1992-2017; (i) W. Lohner, J. Martens, K. Praefcke and H. Simon: Organic Tellurium Compounds III. Photoreactions of tellurole esters in solution , Journal of Organometallic Chemistry 154 (1978) 263; (j) J. Martens and K. Praefcke: Photochemistry of Organic Selenium and Tellurium Compounds , Journal of Organometallic Chemistry 198 (1980) 321.
  6. (a) G. Heppke, J. Martens, K. Praefcke and H. Simon: Selenol ester - a new class of liquid-crystalline compounds , Angewandte Chemie 89 (1977) 328; Angewandte Chemie International Edition in English 16 (1977) 318; (b) K. Praefcke, J. Martens et al. : Tellurol esters in comparison with isoelectronic, liquid-crystalline O, S and Se esters , Chemiker-Zeitung 101 (1977) 450; (c) K. Praefcke: Can thermotropic biaxial nematics be made real? Molecular Crystals and Liquid Crystals 364 (2001) 15.
  7. George W. Gray, CBE, FRS: People in the News: Professor K. Praefcke Symposium , Liquid Crystals Today 8 (1998) 6-7.
  8. ^ Klaus Praefcke and Ilona Dehn: Exploring Kühlungsborn, hidden treasures. TSK Verlag Kühlungsborn 2006.