Characterization of the photoisomers from cis- and trans-chlordanes, trans-nonachlor and heptachlor epoxide |
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Authors: | JR Knox S Khalifa GW Ivie JE Casida |
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Institution: | Division of Entomology and Parisitology, University of California, Berkeley, California 94720 U.S.A. |
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Abstract: | Irradiation of acetone solutions of trans-chlordane (4a) and trans-nonachlor (4b) with UV light produces new half-cage photoisomers (5a or 6a and 5b or 6b, respectively) with bridging that differs from that of the photoisomers (2 and 8a) obtained from cis-chlordane (1b) and heptachlor epoxide (7). A new photoisomer (10) obtained from heptachlor epoxide is transformed into photoisomer 8a on further irradiation. Detailed PMR and 13C-NMR studies establish the structures of the new photoisomers and permit a decision between alternative formulations for the structures of the half-cage photoisomers of heptachlor epoxide and cis-chlordane, |
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