Reported in EPA TSCA Inventory.

The Acetylenedicarboxylic acid monopotassium salt, with the CAS registry number 928-04-1, is also known as 2-Butynedioic acid monopotassium salt. It belongs to the product categories of Aromatic Carboxylic Acids, Amides, Anilides, Anhydrides & Salts; Acetylenes; Acetylenic Carboxylic Acids & Their Derivatives. Its EINECS registry number is 213-169-2. This chemical's molecular formula is C₄HKO₄ and molecular weight is 152.15. What's more, its IUPAC name is called Potassium 4-hydroxy-4-oxobut-2-ynoate. It should be stored in a cool, dry and well-ventilated place.

Physical properties about Acetylenedicarboxylic acid monopotassium salt are: (1)#H bond acceptors: 4; (2)#H bond donors: 2; (3)#Freely Rotating Bonds: 1; (4)Polar Surface Area: 80.26 Å².

Uses of Acetylenedicarboxylic acid monopotassium salt: (1) it is used as organic intermediate; (2) it is used to produce other chemicals. For example, it can react with ethanol to get butynedioic acid diethyl ester. The reaction occurs with reagent H₂SO₄ and other condition of heating for 24 hours. The yield is 95 %.

When you are dealing with this chemical, you should be very careful. This chemical causes damage to health at very low levels. It is toxic by inhalation and if swallowed. This chemical is irritating to eyes, respiratory system and skin. Therefore, you should wear suitable protective clothing, gloves and eye/face protection. In case of contacting with eyes, you should rinse immediately with plenty of water and seek medical advice. And in case of accident or if you feel unwell seek medical advice immediately.

You can still convert the following datas into molecular structure:
(1) SMILES: [K+].[O-]C(=O)C#CC([O-])=O
(2) InChI: InChI=1S/C4H2O4.K/c5-3(6)1-2-4(7)8;/h(H,5,6)(H,7,8);/q;+1/p-2
(3) InChIKey: KLLYWRUTRAFSJT-UHFFFAOYSA-L

The toxicity data is as follows: