ChemInform Abstract: Cycloadditions of 6H-1,3,4-Oxadiazin-6-ones (4,5-Diaza-α-pyrones). Part 16. 4-Substituted and 4,5-Disubstituted Methyl 3-Phenyl-α-pyrone-6-carboxylates from γ-Oxoketenes via α,δ-Dibromo-δ-lactones.

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