Photochemical transformations of small ring compounds. 116. Photochemistry of cyclopropene derivatives. Synthesis of the tricyclo[2.2.0.02,6]hexane ring system via a photosensitized [2 + 2] cycloaddition reaction
Photochemical transformation of small ring compounds. 114. Photochemistry of cyclopropene derivatives. 17. Competition between side-chain fragmentation and ring opening