Propiolic Acid
Title: Propiolic Acid
CAS Registry Number: 471-25-0
CAS Name: 2-Propynoic acid
Additional Names: acetylenecarboxylic acid; propargylic acid
Molecular Formula: C3H2O2
Molecular Weight: 70.05
Percent Composition: C 51.44%, H 2.88%, O 45.68%
Line Formula: CHºCCOOH
Literature References: Prepn: Wilson, Wenzke, J. Am. Chem. Soc. 57, 1265 (1935); Owen, Sultanbawa, J. Chem. Soc. 1949, 3109; Wolf, Ber. 86, 735 (1953); 87, 668 (1954). Manuf: Wolf, US 2786022 (1957); Pachter, US 2799703 (1957 to Ethyl Corp.). Review on its occurrence and biological activity: Reisch, Pharmazie 20, 194 (1965).
Properties: Liquid at room temp (crystals from carbon disulfide, mp 9°). bp 144° (dec), bp10.5 54-55°, bp50 70-75°. d415 1.1435, d420 1.1380, d425 1.1325. nD20.4 1.4302. Dipole moment at 25°, 2.08D (in dioxane): Wilson, Wenzke, loc. cit.
Melting point: Liquid at room temp (crystals from carbon disulfide, mp 9°)
Boiling point: bp 144° (dec); bp10.5 54-55°; bp50 70-75°
Index of refraction: nD20.4 1.4302
Density: d415 1.1435; d420 1.1380; d425 1.1325

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