Melting point :135-137 °C (lit.)
Boiling point :225.74°C (rough estimate)
Density :1.1674 (rough estimate)
refractive index :1.5550 (estimate)
storage temp. :2-8°C
form :Fine Crystalline Powder
pka :pK1:2.269 (35°C)
color :White to slightly beige
Water Solubility :freely soluble
BRN :742587
InChI :InChI=1S/C9H6O2/c10-9(11)7-6-8-4-2-1-3-5-8/h1-5H,(H,10,11)
InChIKey :XNERWVPQCYSMLC-UHFFFAOYSA-N
SMILES :C(O)(=O)C#CC1=CC=CC=C1
CAS DataBase Reference :637-44-5(CAS DataBase Reference)
NIST Chemistry Reference :Phenylpropiolic acid(637-44-5)
EPA Substance Registry System :2-Propynoic acid, 3-phenyl- (637-44-5)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.