“…Upon extending the chain length, difficulties arise with the total separation of increasing number of isomers, the total analysis of which fails. Only a few papers contain suggestions for the partial separation of undecenes (1,23), dodecenes (24), tridecenes (25), tetradecenes (26), hexadecenes (27), and octadecenes (24). Usually the separation of 1-and 2-alkenes from the sum or large groups of other isomers is at stake, sometimes a group separation only (28).…”