Formation of a Novel Cage Compound with a Pentacyclo

Abnormally long C-C single bonds are found in the polycyclic caged diol with a pentacyclo6.3.0.1(4,11).0(2,6).0(5,10)]dodecane skeleton formed by photolysis (see scheme). This skeleton resembles the structure of diamantane, but instead of having six cyclohexane rings in a chair conformation it contains only two cyclohexane rings in a distorted chair conformation and four cyclopentane rings, which makes it more highly strained than diamantane.