Prepare the Grignard reagent, typically by reacting an alkyl or aryl halide with magnesium metal in anhydrous conditions. For the synthesis of the Drosophila melanogaster sex pheromones, you would need a specific Grignard reagent that corresponds to the desired alkyl or aryl group in the final compound.
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HEPTACOSA-7Z,11Z-DIENE
methyl 4-methyl-5-oxo-5(4' methyl)-phenyl pentanoate
