A method for the stereoselective production of the insecticide 6,7,8,9,10,10 - hexa halo - 1,5,5a, 6,9,9a - hexahydrophthalic - 6,9 - methano - 2,4,3 - benzodioxathiepin - 3 - oxide

摘要

A method for the stereoselective production of the insecticide 6,7,8,9,10,10 - hexa halo - 1,5,5a, 6,9,9a - hexahydrophthalic - 6,9 - methano - 2,4,3 - benzodioxathiepin - 3 - oxide of the general formula i: in the x is a halogen, such as, for example, fluorine, chlorine or bromine, characterized in that 1,4,5,6,7,7 - hexa halo - 5 - norbornene - 2,3 - dimethylamino of the general formula iv # # str5 # #: in the x is, as defined above, with a reagent forming a cyclic sulfite ring, optionally in an inert organic solvent, at ambient temperature of up to 139°C. is brought to reaction, wherein the reaction in the presence of a stereoisomerically - by means of steering system is carried out, said an isomer of the compound of formula i embraces, which is different from the desired isomer, wherein the molar ratio of the stereoisomerically - steering means for dimethylamino - connection of the formula iv is at least 0,07.