Dieckmann condensation of 9 by treatment with postassium t-butoxide gave 10, which was
hydrolyzed and decarboxylated to give (2RS,6S)-2,6-dimethylcycloheptanone 11 (Figure 15). This
dimethyl ketone 11 was further methylated to give 12. Finally (S)-12 was converted to crystalline
(1R,2S)-ketone 1 by Stork modification of the Robinson annelation. This ketone 1 was also reported as
a natural pheromone, but its chiroptical data were not reported