K. Kimura, M. Takamura, Shigeru Koshibe
Mar 1, 1976
Citations
0
Influential Citations
4
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The photochemical ring expansion of dispiro substituted cyclobutane-1,3-diones in methanol has been investigated. The formation of ring expansion product was strongly dependent on the spiro ring size of dispiro substituent. The ring expanded acetal was obtained in a low yield when the spiro ring of dispiro substituted cyclobutane-1,3-diones was a five- or seven-membered ring. This is the first example of photochemical ring expansion from cyclobutane-1,3-diones. A mechanism is postulated.