2-Propynal
[CAS# 624-67-9]

Identification

• Name: 2-Propynal
• Synonyms: Acetylenecarboxaldehyde; Formylacetylene; Propargylaldehyde; Propiolic aldehyde; Propynal
• Molecular Formula: C₃H₂O
• Molecular Weight: 54.05
• CAS Registry Number: 624-67-9
• EC Number: 210-857-4

Properties

• Solubility: Sparingly soluble (25 g/L) (25 ºC), Calc.^*
• Density: 0.9160 g/cm³ (20 ºC)^**
• Melting point: 126-127 ºC^***
• Boiling point: 60 ºC^****
• Refractive index: 1.4070 (589.3 nm 20 ºC)^*****
• Flash point: 4.8±15.7 ºC, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2017 ACD/Labs)

^** Veliev, M. G.; Synthesis 1980, (6), P461.

^*** Pasedach, Heinrich; DE 1207930 1965.

^**** "PhysProp" data were obtained from Syracuse Research Corporation of Syracuse, New York (US)

^***** Petrov, A. A.; Zhurnal Obshchei Khimii 1955, V25, P1101-5.

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Flammable liquids	Flam. Liq.	3	H226
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335
Flammable liquids	Flam. Liq.	2	H225
Skin sensitization	Skin Sens.	1	H317
Serious eye damage	Eye Dam.	1	H318
Eye irritation	Eye Irrit.	2	H319
Acute toxicity	Acute Tox.	2	H300
Acute toxicity	Acute Tox.	2	H330