(+/-)-Porosadienone (9) is easily synthesized by starting from (+/-)-2
,6-dimethylcyclohexanone via indenone 1 and dienone 4. All compounds (
rac-4-6 and rac-9) with the alpha,beta,gamma,delta-dienone system are
very prone to air oxidation forming the corresponding mono epoxides ra
c-7, rac-8, rac-10, and rac-11.