By H. Geissbühler, P. C. Kearney and G. T. Brooks (Eds.)

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**Sample text**

The latter condenses with hydroxylamine to give the corresponding oximes (1, X =NOH) which react with methyl isocyanate affording the corresponding carbamates (1, X =NO-CO-NH-CH3) and thus providing a hitherto unknown series of oxime carbamates incorporating the methylenedioxyphenyl ring structure for testing as insecticides which may act as their own synergists. (1, X =0) react with sodium borohydride to give (2, R1 =R"= H) , whereas with organomagnesium halides they afford the tertiary alcohols (2, R1 = H, R"= alkyl or aryl).

G. 5-dibromotrifluoromethylbenzene. ι^F 3J DJ. -P. Prickel, Ph. Rossy. -W. Wiersdorff BASF AG, Hauptlaboratorium, D-67OO Ludwigshafen I-109 READILY AVAILABLE THIOPHENE INTERMEDIATES Within recent years there has bean a tendency towards replacement of the benzene substructure in biologically active compounds with thiophene. The versatile thiophene intermediate thiophene-3-aldehyde(l) can be prepared by hydroformylation of 2,5-dimethoxy-2,5-dihydrofurane followed by S-insersion and aromatization.

1. R. , et al, Computers & Chem, _1, 187 (1977) 2. T. Matsuo, et al, Agr. Biol. Chem. 40, (1) 247 (1976) G. Holan. F. O'Keefe, K. Rihs, R. T. Virgona CSIRO, Division of Applied Organic Chemistry, Melbourne, Victoria, Australia. NEW INSECTICIDES. STRUCTURES II-7 COMBINED DDT - ISOSTERES AND PYRETHROID The size limitation and the biological role of our previously postulated structural model for DDT-type of insecticides was used to design an insecticide 2,2-dimethyl1,1-bis (4-ethoxyphenyl)-cyclopropane, which is isosteric with DDT but also contains the dimethylcyclopropane part structure of pyrethroids.