Title: Oxalacetic Acid
CAS Registry Number: 328-42-7
CAS Name: Oxobutanedioic acid
Additional Names: oxosuccinic acid; ketosuccinic acid
Molecular Formula: C4H4O5
Molecular Weight: 132.07
Percent Composition: C 36.38%, H 3.05%, O 60.57%
Line Formula: HOOCCOCH2COOH
Literature References: Prepd by hydrolyzing sodium diethyloxalacetate with concd HCl: Heidelberger, Hurlbert, J. Am. Chem. Soc. 72, 4704 (1950). Prepn of cis-enol form: Heidelberger, Biochem. Prep. 3, 59 (1953).
Derivative Type: Diethyl ester see Ethyl Oxalacetate
Derivative Type: trans-enol Form
Additional Names: Hydroxyfumaric acid
Properties: Crystals from acetone + benzene, mp 184°. K at 17° = 2.76 ´ 10-3. Soluble in water, ethanol, ether. Can be converted into the lower-melting cis-form, mp 152°, by dissolving the acid in water and re-isolating it as rapidly as possible.
Melting point: mp 184°; mp 152°
Derivative Type: cis-enol Form
Additional Names: Hydroxymaleic acid
Properties: Crystals from ethyl acetate + carbon tetrachloride, mp 152°. K at 17° = 2.505 ´ 10-3. Sol in ethanol, acetone, ethyl acetate. Sparingly sol in ether. Insol in benzene, chloroform, ligroin.
Melting point: mp 152°
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