YCLO[6.5.0.1(7,11).0(3,8)]TETRADEC-6-ENE-5,9-DIONE

The title compound, C16H2O3, was Prepared by the photolysis of oxy-2-m ethyl-2-(4-methyl-3-pentenyl)-4-chromanone. The H7 and H9 atoms are in an alpha configuration. The cyclobutane ring is non-planar, the cyclo hexenone ring has a half-chair conformation, the pyranone ring has a s ofa conformation and the cycloheptanone ring has a boat conformation. The groups of atoms C11, C12, C13, O14 and C12, C13, O14, C4 are both planar.