A Synthesis of Important Pyrethroids.- 1 Synthesis of Pyrethroid Acids.- 2 Synthesis of Important Pyrethroid Alcohols.- 3 Formation of the Pyrethroid-Ester-Linkage.- 4 Non-Ester Pyrethroids.- B Patent Applications for Synthetic Pyrethroid ActiveIngredients.- 5 Analysis of International Pyrethroid Patent Activity.- Abbreviations.- Literature.