Htickel, Erich

Housefly, sex attractant of, 255 HPLC, 432 Hiickel, Erich, 523 Htickel 4/j + 2 rule, 523... 

Erich Htickel, "Quantentheorie der Doppelbindung," ZP 60 (1930) 423456. Hund was at Heisenberg s Institute of Theoretical Physics and Peter Debye was at the nearby Institute of Physical Chemistry in 1930, according to Mulliken in an interview with Thomas Kuhn, February 1, 1964, 2d of 2 sessions, SHQP, Berkeley. 

In 1931, Erich Htickel postulated that monocyclic (single ring) planar compounds that contained carbon atoms with unhybridized atomic p orbitals would possess a closed bond shell of delocalized n electrons if the number of n electrons in the molecule fit a value of 4 + 2 where n equaled any whole number. Because a closed bond shell of n electrons defines an aromatic system, you can use Hiickel s Rule to predict the aromaticity of a compound. For example, the benzene molecule, which has 3 n bonds or 6 n electrons, is aromatic. 

Erich Htickel was a German physical chemist first known for his collaboration with Peter Debye in developing what remains the most widely accepted theory of electrolyte solutions, then later for his application of molecular orbital theory to conjugated hydrocarbons, especially aromatic hydrocarbons (Chapter 11). 

Rragh, H. 1996. The young Erich Htickel. His scientific work until 1925. Invited paper at the Erich Htickel s FestKolloquium, 28 October 1996, University of Marburg. 

Professor Erich Htickel (1896-1984), University of Marburg, Germany. 

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