Penta-2,3-dienedioic acid

Penta-2,3-dienedioic acid
(R) enantiomer	(S) enantiomer
Names
	IUPAC name Penta-2,3-dienedioic acid
	Other names 1,3-Allenedicarboxylic acid; Diacrylic acid; Glutinic acid; 2,3-Pentadienedioic acid;
Identifiers
CAS Number	32804-68-5;
3D model (JSmol)	R-glutinic acid: Interactive image; S-glutinic acid: Interactive image;
ChemSpider	4411426;
PubChem CID	135471958;
CompTox Dashboard (EPA)	DTXSID00412684 ;
	InChI InChI=1S/C5H4O4/c6-4(7)2-1-3-5(8)9/h2-3H,(H,6,7)(H,8,9) Key: FEFVVCZNGBRBSB-UHFFFAOYSA-N;
	SMILES R-glutinic acid: O=C(O)C=C=CC(O)=O; S-glutinic acid: O=C(O)C=C=C([H@])C(O)=O;
Properties
Chemical formula	C5H4O4
Molar mass	128.083 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Penta-2,3-dienedioic acid (one of two chemicals called glutinic acid), is an allene-containing dicarboxylic acid. It was the first allene to be synthesized, in 1887, but the structure of it was thought to be a propyne core instead of an allene. The correct structural isomeric identity was not determined until 1954.^[1]

Literature confusion

A diterpene, chemical name (4aR,5S,6R,8aR)-5-[(Z)-4-carboxy-3-methylbut-3-enyl]-5,6,8a-trimethyl-3,4,4a,6,7,8-hexahydronaphthalene-1-carboxylic acid (CID 6444268 from PubChem), is also called glutinic acid. Some database entries for "glutinic acid" incorrectly identify it as this diterpene rather than the allene meaning in the underlying publications.^[2]

References

^ Jones, E. R. H.; Mansfield, G. H.; Whiting, M. C. (1954-01-01). "Researches on acetylenic compounds. Part XLVII. The prototropic rearrangements of some acetylenic dicarboxylic acids". Journal of the Chemical Society (Resumed): 3208–3212. doi:10.1039/JR9540003208. ISSN 0368-1769.
^ See patents listed for CID 6444268 from PubChem

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[1] Jones, E. R. H.; Mansfield, G. H.; Whiting, M. C. (1954-01-01). "Researches on acetylenic compounds. Part XLVII. The prototropic rearrangements of some acetylenic dicarboxylic acids". Journal of the Chemical Society (Resumed): 3208–3212. doi:10.1039/JR9540003208. ISSN 0368-1769.

[2] See patents listed for CID 6444268 from PubChem

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