A Chemico-Enzymatic Synthesis of All Four Stereoisomers of 1,6-Dimethyloct-1-yl Formate, an Aggregation Pheromone Mimic for the Smaller Flour Beetle

(2R,6R)-, (2R,6S)-, (2S,6R)- and (2S,6S)-2,6-dimethyloct-1 -yl formates have been prepared from S-(+)- and R-(–)-enantiomers of 3,7-dimethylocta-1,6-diene via enantioselective hydrolysis of (2R/S,6R)- and (2R/S,6S)-2,6-dimethyloct-1-yl formates with porcine pancreatic lipase as the key step.