Klaus Praefcke

Klaus Praefcke

Klaus Praefcke
Born (1933-01-03)3 January 1933
Wustrow, Mecklenburg, Germany
Died 20 November 2013(2013-11-20) (aged 80)
Nationality German
Fields Chemist
Institutions Technical University of Berlin
Alma mater Technical University of Berlin
Doctoral advisor Alexander Schönberg
Known for Liquid crystals
Notable awards Georg-Ernst-Stahl-Medal

Klaus Praefcke (3 January 1933 – 20 November 2013)[1] was a German chemist. He was born in Wustrow and studied in Berlin under the supervision of Alexander Schönberg. After completing his Ph.D. in 1963 and his habilitation in 1970, he became Professor of Organic Chemistry at the Technical University of Berlin in 1971. He stayed dedicated to the research until 1998 at the same institution.

Praefcke has published more than 300 scientific papers dedicated to organic synthesis. He is known for his contributions to preparative organic photochemistry[2] as well as physics and chemistry of liquid crystals.[3] Several novel types of liquid crystals have been synthesized by Praefcke for the first time.[4]

References

  1. ↑ TU Berlin
  2. ↑ (a) J. Martens and K. Praefcke: Organische Schwefelverbindungen VII : Photochemische α-Spaltung von Thiobenzoesäure-S-p-tolylestern in Lösung, Chemische Berichte 107 (1974) 2319; (b) G. Buchholz, J. Martens and K. Praefcke: 2- und 4-Azathioxanthone durch Photoumlagerung von Thionicotinsäure-S-arylestern, Angewandte Chemie 86 (1974) 562; Angewandte Chemie International Edition in English 13 (1974) 550; (c) G. Buchholz, J. Martens and K. Praefcke: Photochemische Thioxanthon-Synthese aus Halogenthiobenzoesäure-S-arylestern, Synthesis 1974, 666; (d) J. Martens, K. Praefcke and H. Schwarz: Organische Schwefelverbindungen VI : Thioxanthonsynthese durch Photoumlagerung von Diaryl-α-ketosulfiden (Thiolestern), eine neue lichtinduzierte aromatische Substitutionsreaktion, Tetrahedron 30 (1974) 2565; (e) G. Buchholz, J. Martens and K. Praefcke: Organische Photochemie VII : Photosubstitution von 1-Halogenthioxanthonen, Tetrahedron Letters 1975, 3213; (f) J. Martens, K. Praefcke and U. Schulze: Intramolekulare Photo-Friedel-Crafts-Reaktionen; ein neues Syntheseprinzip für Heterocyclen, Synthesis 1976, 532; (g) J. Martens, K. Praefcke and H. Simon: Photochemistry of Selenol Esters, Zeitschrift für Naturforschung 31b (1976) 1717; (h) R. Lüdersdorf, J. Martens, B. Pakzad and K. Praefcke, Organische Photochemie XIV: Photoreaktionen sulfinylsubstituierter Carbonsäure-, Thiocarbonsäure- und Selenocarbonsäurederivate in Lösung; lichtinduzierte Säurespaltungen, Heterocyclenbildungen und Photosubstitutionen, Liebigs Annalen der Chemie 1977, 1992-2017; (i) W. Lohner, J. Martens, K. Praefcke and H. Simon: Organische Tellurverbindungen III. Photoreaktionen von Tellurolestern in Lösung, 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.
  3. ↑ (a) G. Heppke, J. Martens, K. Praefcke and H. Simon: Selenolester - eine neue Klasse flüssigkristalliner Verbindungen, Angewandte Chemie 89 (1977) 328; Angewandte Chemie International Edition in English 16 (1977) 318; (b) K. Praefcke, J. Martens et al.: Tellurolester im Vergleich mit isoelektronischen, flüssig-kristallinen O-, S- und Se-Estern, Chemiker-Zeitung 101 (1977) 450; (c) K. Praefcke: Can thermotropic biaxial nematics be made real? Molecular Crystals and Liquid Crystals 364 (2001) 15.
  4. ↑ George W. Gray, CBE, FRS: People in the News: Professor K. Praefcke Symposium, Liquid Crystals Today 8 (1998) 6-7.
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