AM1 semi-empirical SCF MO calculations for the structure optimization and c
onfigurational properties of cyclonona-1,2,4,5,7,8-hexaene 3, its hexamethy
l derivative 4 and cyclododeca-1,2,5,6,9,10-hexaene 5 show that the combina
tion of three allenic units of the same chirality yields an enantiomeric pa
ir which is the most stable configuration of 3, 4 and 5.