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- W1984920346 abstract "Synthesis of Bromosubstituted Butenolides II. Methyl 4,4′-dibromosenecioate (2) was prepared by double N-bromosuccinimide bromination of methyl senecioate (1) and converted to methyl 4,4′-diiodo-senecioate (3) with sodium iodide and to 3-bromomethyl-2-buten-4-olide (4) with aqueous hydrobromic acid. A mixture of methyl (Z)- and (E)-4-bromosenecioate (8 and 9) yielded 3-methyl-2-butenolide (5) with aqueous hydrobromic acid and a mixture of (Z)-and (E)-4-methoxy-senecioic acid (10 and 11) with methanolic potassium hydroxide. N-Bromosuccinimide treatment of the butenolide 5 afforded 4-bromo-3-methyl-2-buten-4-olide (6) and 4,4-dibromo-3-methyl-2-buten-4-olide (7)." @default.
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- W1984920346 date "1976-12-15" @default.
- W1984920346 modified "2023-10-11" @default.
- W1984920346 title "Synthese von bromosubstituierten Butenoliden II" @default.
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- W1984920346 doi "https://doi.org/10.1002/hlca.19760590811" @default.
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