Effect of spiro ring size on the photochemical ring expansion of dispiro substituted cyclobutane-1, 3-diones.

K Kimura, M Takamura, S Koshibe, M Juro…

文献索引：Kimura,K. et al. Bulletin of the Chemical Society of Japan, 1976 , vol. 49, # 3 p. 741 - 745

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被引用次数: 3

摘要

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 ...