An Efficient Synthesis of a Novel Pentacyclo [5.4.0.02,6.03,10.05,9] Undecane-8, 11-Dione-4-Spiro-1-Cyclopentane

Abstract
An efficient synthesis of the title compound by Diels-Alder cycloaddition of spiro (4.4) nonadiene with p-benzoquinone followed by photochemical ring closure is described.