The aldehydes cis-9-tetradecenyl aldehyde and cis-11-hexadecenyl aldehyde – the components of sunflower moth sex pheromone were synthesized from the alkyl-derivatives of the propargilic alcohol through their isomerization in the presence of sodium amide in ethylenediamine to the adequate acetylenic alcohols with a terminal triple bond. Hydroxyl group protection of the alcohols obtained with 2,3-dihydropyran, followed by alkylation with 1-bromo-heptane bromide in liquid ammonia, leads to acetales 1-(2׳-tetrahydropyranyloxy)-tetradecine-9 [1-(2׳-tetrahydropyranyloxy)- hexadecyne-11], which, after hydroxyl group deprotecting (16% sulfuric acid, ethanol), are transformed in acetylenic alcohol tetradecyne-9-ol-1 [hexadecine-11-ol-1]. The las is reduced in the presence of a catalyst of Ni with ethylenediamine in ethanol. And then is transformed in cis-9- tetradecenol-1 [respective cis-11-hexadecenol-1]. Through oxidation the alcohols thus obtained with chromatepyridine in methylenechloride the aldehydes cis-9- tetra--decenyl aldehide [respective cis-11-hexadecenyl aldehide] are obtained — components of sun-flower moth sex pheromone.