The Propiolic acid with CAS registry number of 471-25-0 is also known as 2-Propynoic acid. The IUPAC name is Prop-2-ynoic acid. It belongs to product categories of Aromatic Carboxylic Acids, Amides, Anilides, Anhydrides & Salts; Acetylenes; Acetylenic Carboxylic Acids & Their Derivatives; Diyne Compounds (LB Films); Functional Materials; LB Films. Its EINECS registry number is 207-437-8. In addition, the formula is C₃H₂O₂ and the molecular weight is 70.05. This chemical is a colorless liquid and slightly soluble in water. What's more, this chemical should be sealed in ventilated and dry place away from oxidants at the temperature of 2-8 °C.

Physical properties about Propiolic acid are: (1)ACD/LogP: 0.296; (2)ACD/LogD (pH 5.5): -3.01; (3)ACD/LogD (pH 7.4): -3.45; (4)ACD/BCF (pH 5.5): 1.00; (5)ACD/BCF (pH 7.4): 1.00; (6)ACD/KOC (pH 5.5): 1.00; (7)ACD/KOC (pH 7.4): 1.00; (8)#H bond acceptors: 2; (9)#H bond donors: 1; (10)Index of Refraction: 1.456; (11)Molar Refractivity: 15.34 cm³; (12)Molar Volume: 56.446 cm³; (13)Polarizability: 6.081 10-24cm³; (14)Surface Tension: 52.9939994812012 dyne/cm; (15)Density: 1.241 g/cm³; (16)Flash Point: 58.889 °C; (17)Enthalpy of Vaporization: 41.587 kJ/mol; (18)Boiling Point: 139.725 °C at 760 mmHg; (19)Vapour Pressure: 3.65499997138977 mmHg at 25°C

Preparation of Propiolic acid: it is prepared by reaction of acetylene sodium with carbon dioxide. The reaction occurs at the temperature below 90 °C and the pressure 3.55-7.09 MPa.

Uses of Propiolic acid: it is used for organic synthesis. For example, it is used to produce 3c-phenylselanyl-acrylic acid by reaction with benzeneselenol. The reaction occurs with reagent NaOMe and solvent ethanol at the temperature of 60 °C for 2 hours. The yield is about 80.3%.

When you are using this chemical, please be cautious about it. As a chemical, it is toxic by inhalation, in contact with skin and if swallowed. Besides, it may cause burns. During using it, wear suitable protective clothing, gloves and eye/face protection. Avoid contact with skin and eyes. After using it, keep container tightly closed and in a well-ventilated place. If contact with eyes accidently, rinse immediately with plenty of water and seek medical advice. In case of accident or if you feel unwell seek medical advice immediately.

You can still convert the following datas into molecular structure:
1. Canonical SMILES: C#CC(=O)O
2. InChI: InChI=1S/C3H2O2/c1-2-3(4)5/h1H,(H,4,5)
3. InChIKey: UORVCLMRJXCDCP-UHFFFAOYSA-N

The toxicity data is as follows: