The irradiations of 5-alkyl-1-hydroxy-8-oxabicyclo[3.2.1]octa-3,6-dien-2-ones, either in benzene or methanol by means of a high-pressure mercury lamp produced 2-alkyl-3-oxatricyclo[3.3.0.02,8]octane-4,6-diones. Although the intermediate ketenes could be detected by low temperature NMR, no adduct was formed in protic solvents.
No takes yet. Share an insight, caveat, or question.
Mori et al. (1988) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: