PHOTOCHEMISTRY OF PESTICIDES, 71. REGIOSELECTIVE PHOTODIMERIZATION OF o,o-DIETHYL-o-(3-CHLORO-4-METHYLCOUMARIN-7-YL)-THIOPHOSPHATE (COUMAPHOS) |
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| Authors: | Wafaa M Abdou Liborius Born Herwig Hulpke M Refat Mahran Mahmoud M Sidky Heinrich Wamhoff |
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| Institution: | 1. Laboratory of Pesticide Chemistry , National Research Centre , El-Tahrir Street, Dokki, Cairo, A. R. Egypt;2. Bayer AG , D-5090, Leverkusen, Bundesrepublik Deutschland;3. Institut für Organische Chemie und Biochemie der Universit?t Bonn , Gerhard-Domagk-Str. 1, D-5300, Bonn, 1, Bundesrepublik, Deutschland |
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| Abstract: | Abstract UV-irradiation (λ > 313 nm) of o,o-diethyl-o-(3-chloro-4-methyl-coumarin-7-yl)-thiophosphate (Coumaphos; 1) in chloroform results in an regioselective dimerization reaction to afford the head-to-tail anti-dimer 2. The structure of 2 is established by single crystal x-ray diffraction. Singlet oxygen does not affect the formation of 2. |
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