| abstract |
Styryl-cyclopropane derivatives of the formula ##STR1## in which R 9 represents independently of one another when n=2, halogen, cyano, nitro, or an optionally halogen-substituted alkyl, alkoxy, alkylthio or alkylenedioxy radical, n n represents zero, 1, 2, 3, 4 or 5, n R 10 represents hydrogen or halogen n and n Y represents acetyl, cyano or carbamoyl, are produced by reacting a benzylphosphonic acid ester of the formula ##STR2## in which R 4 each independently represents alkyl or phenyl or together represent alkylene, with a formylcyclopropane derivative of the formula ##STR3## or by reacting an α-hydroxyphosphonic acid ester of the formula ##STR4## with an olefinating agent of the formula ##STR5## in which Z' represents a phosphorus-containing radical ##STR6## wherein R 5 and R 6 are identical or different and individually represent alkyl, phenyl, alkoxy or pehnoxy or R 5 and R 6 together represent alkanedioxy, n R 7 represents alkyl or phenyl and n X represents halogen, in the presence of a base at a temperature between about -70° and +150° C. Other olefins can be similarly prepared. Many intermediates are new and the end products are themselves intermediates for insecticides. |