66. A Stereoselective Approach to the Spiro [4, 5]decane System via Intramolecular Photocycloaddition and Reductive Fragmentation. Preliminary communication
    Oppolzer, W.; Gorrichon, L.; Bird, T. G. C.
    Helv. Chim. Acta 1981, 64, 186-187

The photoaddition 6→7, followed by a reductive cleavage of the →-chlorocyclobutylketone 7, gave the stereochemically pure spiro [4,5]decane 8.

DOI : 10.1002/hlca.19810640120