In this step, you can control the stereochemistry of the double bond. If you specifically want the (E)-isomer, you may need to use stereospecific reactions or carefully control the conditions to favor the formation of the (E)-isomer.
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[(E)-4-(4-Methyl-cyclohex-3-enyl)-2-oxo-pent-3-enyl]-phosphonic acid diethyl ester
Methyl vinyl ketone
p-Toluenesulfonic acid
