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The synthesis of 2-buten-4-olides by the dehydrochlorination of α-chloro-γ-butyrolactones, α-chloro-α-methyl-γ-butyrolactones, and α, α-dichloro-γ-butyrolactones with pyridine was investigated.<BR>The dehydrochlorination of α-chloro-γ-butyrolactones gave the corresponding 2-buten-4-olides in satisfactory yields (58-85%).<BR>The clehydrochlorination of γ-alkyl-α, α-dichloro-γ-butyrolactones gave 4-alkylidene-2buten-4-olides in 41-74% yields, while that of γ, γ-disubstituted α, α-dichloro-γ-butyrolactones afforded 4, 4-disubstituted 2-buten-4-olides in 57-82% yields. - A mechanistic pathway leading to the 4-alkylidene-2-buten-4-olide is presented.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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