Journal of Organic Chemistry p. 3046 - 3050 (1985)
Update date:2022-09-26
Topics:
Pavlik, James W.
Spada, Alfred P.
Snead, Thomas E.
4-Hydroxypyrylium cations that are known to undergo phototransposition to 2-hydroxypyrylium cations in concentrated sulfuric acid were observed to undergo photo-ring contraction in 50percent sulfuric acid.The initial products observed when the irradiations are carried out at 0 deg C are 4,5-dihydroxycyclopent-2-enones that can be isolated.At higher temperatures these initial products undergo secondary acid catalyzed thermal reactions to yield substituted acetylfurans.
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