丁二烯酸

丁二烯酸
識別
CAS號	5732-10-5
SMILES	O=C(O)C=C=C;
性質
化學式	C4H4O2
摩爾質量	84.07 g·mol−1
熔點	65-66 °C
	若非註明，所有數據均出自標準狀態（25 ℃，100 kPa）下。

丁二烯酸是一種有機化合物，化學式為C₄H₄O₂。它可由3-丁炔酸和18%碳酸鉀溶液於40 °C反應，再酸化後製得。^[1]它和碘化鈉在乙酸中反應，可以得到3-碘-3-丁烯酸。^[2]它和環戊二烯於乙醚中反應，可以得到3-亞甲基雙環[2.2.1]辛-5-烯-2-甲酸，內型（endo）與外型（exo）異構體之比為68:32。^[3]

參考文獻

^ ^1.0 ^1.1 G. Eglinton, E. R. H. Jones, G. H. Mansfield and M. C. Whiting. Researches on acetylenic compounds. Part XLV. The alkaline isomerisation of but-3-ynoic acid. J. Chem. Soc., 1954, 3197-3200. doi:10.1039/JR9540003197.
^ Shengming Ma, Zhangjie Shi, and Lintao Li. Efficient Synthesis of 4-Halo-4-penten-2-ones and 3-Halo-3-butenoic Acids/Esters via Hydrohalogenation Reaction of 3,4-Pentadien-2-one and 2,3-Butadienoic Acid/Methyl Ester. J. Org. Chem. 1998, 63, 13, 4522–4523. doi:10.1021/jo980129f.
^ Z. M. Ismail and H. M. R. Hoffmann. Endo selectivity of allenic esters in Diels-Alder additions to cyclopentadiene. The effect of added aluminum trichloride and an approach to dehydrosantalene analogs. J. Org. Chem. 1981, 46, 17, 3549–3550. doi:10.1021/jo00330a036.

[Eglinton-1] 1.0 ^1.1 G. Eglinton, E. R. H. Jones, G. H. Mansfield and M. C. Whiting. Researches on acetylenic compounds. Part XLV. The alkaline isomerisation of but-3-ynoic acid. J. Chem. Soc., 1954, 3197-3200. doi:10.1039/JR9540003197.

[2] Shengming Ma, Zhangjie Shi, and Lintao Li. Efficient Synthesis of 4-Halo-4-penten-2-ones and 3-Halo-3-butenoic Acids/Esters via Hydrohalogenation Reaction of 3,4-Pentadien-2-one and 2,3-Butadienoic Acid/Methyl Ester. J. Org. Chem. 1998, 63, 13, 4522–4523. doi:10.1021/jo980129f.

[3] Z. M. Ismail and H. M. R. Hoffmann. Endo selectivity of allenic esters in Diels-Alder additions to cyclopentadiene. The effect of added aluminum trichloride and an approach to dehydrosantalene analogs. J. Org. Chem. 1981, 46, 17, 3549–3550. doi:10.1021/jo00330a036.

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