Summary: The polyfunctional alkylidenemalonates 1, readily prepared by an addition- elimination reaction of FG-RCu (CN) ZnI to [(phenylsulfonyl) methylidene]-malonates of type 7, were found to undergo a highly chemoselective and stereoselective olefination reaction with 1, l-dimetalloalkanes of zinc and magnesium. An application to the stereospecific preparation of an insect pheromone 8 is reported.
