IUPAC Name: 1-dichlorophosphorylpropane 
Empirical Formula: C₃H₇Cl₂OP
Molecular Weight: 160.9668 
EINECS: 225-195-1 
Structure of Propylphosphonic dichloride (CAS NO.4708-04-7):

Index of Refraction: 1.433
Molar Refractivity: 32.51 cm³
Molar Volume: 124.9 cm³
Polarizability: 12.89×10^-24cm³
Surface Tension: 33.4 dyne/cm
Density: 1.288 g/cm³
Flash Point: 68.7 °C
Enthalpy of Vaporization: 39.22 kJ/mol
Boiling Point: 172.6 °C at 760 mmHg
Vapour Pressure: 1.76 mmHg at 25°C 
Product Categories: Organic Building Blocks;Phosphorus Compounds;Phosphorus Halides 
Canonical SMILES: CCCP(=O)(Cl)Cl
InChI: InChI=1S/C3H7Cl2OP/c1-2-3-7(4,5)6/h2-3H2,1H3
InChIKey: CWMQAFZROJAZQS-UHFFFAOYSA-N

Hazard Codes: T
Risk Statements: 23/24/25-34 
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R34:Causes burns.
Safety Statements: 23-26-36/37/39-45
S23:Do not breathe vapour. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 3265 8/PG 2
WGK Germany: 3
HazardClass: 8
PackingGroup: II

  Propylphosphonic dichloride , its cas register number is 4708-04-7. It also can be called n-Propylphosphonic dichloride ; 1-Propanephosphonic dichloride ; phosphonic dichloride, P-propyl- . Propylphosphonic dichloride (CAS NO.4708-04-7) is a clear yellow to orange-brown liquid.