Omega-halo-2-alkynal, method for producing same, and method for producing conjugated z-alken-yn-yl acetate using same

A method for producing a conjugated Z-alken-yn-yl acetate, comprising the steps of:

• hydrolyzing an ω-halo-1,1-dialkoxy-2-alkyne represented by formula (2):
• wherein R1 and R2 are the same or different and each represents a linear, branched or cyclic C1-10 hydrocarbon group, X represents a halogen atom, and n stands for an integer of from 2 to 15,
• into a ω-halo-2-alkynal represented by formula (1):
• in water and an organic solvent in the presence of sulfonic acid,
• reacting the ω-halo-2-alkynal with an alkylidene triphenylphosphorane represented by formula (3):
• RCH═PPh3 (3)
• wherein R represents a linear branched or cyclic C1-12 hydrocarbon group and Ph represents a phenyl group,
• through a Wittig reaction to obtain a conjugated Z-alken-yn-yl halide represented by formula (4):
• and
• acetoxylating the conjugated Z-alken-yn-yl halide into a conjugated Z-alken-yn-yl acetate represented by formula (5):
• wherein R represents a linear, branched or cyclic C1-12 hydrocarbon group.