Photodimerisierung von 6-trans-Styryl-4-methoxy-2-pyron (= 5.6-Dehydrokawain), 1. Mitteilung / Photodimerisation of 6-trans-Styryl-4-methoxy-2-pyrone (= 5,6-Dehydrokawain)

Macki Kaloga 1  and Ilona Christiansen 1
  • 1 Institut für Pharmakognosie und Phytochemie der Freien Universität Berlin, Königin-Luise-Straße 2 + 4, D-1000 Berlin 33


The photochemical behaviour of 5,6-Dehydrokawain (1) was investigated. An aceton solution of 1 was placed into a Petri-dish and allowed to evaporate. After a four weeks irradiation with a 100 W light bulb from a distance of 30 cm [1] the main component was isolated. Its structure and configuration is elucidated as r-1,c-2-di[6-(4-methoxy-2- pyronyl) ] - t- 3 ,t -4-diphenyIcyclobutane (2) by means of spectroscopic methods and correlation with β-truxinic acid after degradative reaction.

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Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.