The sensitized irradiation of 2-(4-pentenyl)-substituted cyclopropenes produces tricycle [3.3. 0.01* 3] octanes by means of a novel intramolecular [2+ 21 cycloaddition. In dramatic contrast to the photochemical results, thermolysis affords a product containing the bicyclo [4.1. O] heptane ring. The thermal reaction proceeds via ring opening of the cyclopropene to give a vinylcarbene, which subsequently adds across the neighboring a-bond. The ...
![Benzene,[(2-phenylethynyl)sulfonyl]- Structure](https://image.chemsrc.com/caspic/359/5324-64-1.png)
