Stereoselective Syntheses of the Isomeric 5, 10‐Pentadecadienals

Abstract
The four isomeric 5, 10‐pentadecadienals 1, 2, 3 and 4 were prepared by stereo‐selective routes from acetylenic precursors. Two of them, 2 and 4, were also made by Wittig reaction from 2‐hydroxytetrahydropyran (29). 2‐Hydroxytetrahydropyran (29) yields (Z)‐5‐alkenols efficiently by Wittig reaction, and (Z)‐4‐hexenol was similarly made from 2‐hydroxytetrahydrofuran (66).