Propyne

CAS Registry Number®

74-99-7

CAS Name

Propyne

Molecular Formula

C3H4

Molecular Mass

40.06

Cite this Page

Propyne.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/ChemicalDetail.aspx?ref=74-99-7 (retrieved 2025-07-18) (CAS RN: 74-99-7).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Boiling Point (1)

    -23.2 °C @ Press: 760 Torr

  • Melting Point (2)

    -102.7 °C

  • Density (1)

    0.7062 g/cm³ @ Temp: -50 °C

Source(s)

  • (1) Hazardous Substances Data Bank data were obtained from the National Library of Medicine (US)
  • (2) International Chemical Safety Cards data were obtained from the National Institute for Occupational Safety and Health (US)

Other Names and Identifiers

InChI

InChI=1S/C3H4/c1-3-2/h1H,2H3

InChIKey

InChIKey=MWWATHDPGQKSAR-UHFFFAOYSA-N

SMILES

C(C)#C

Canonical SMILES

C#CC

Other Names for this Substance

  • 1-Propyne
  • Propyne
  • Methylacetylene
  • Propine
  • Allylene

Deleted or Replaced CAS Registry Numbers

369597-38-6

CAS INSIGHTSTM
Webinar image of people on a WebEx conference