IUPAC Name: (E)-But-2-enoyl chloride  
CAS: 10487-71-5         
Formula: C₄H₅ClO
Molecular Weight: 104.53
Molecular Structure of (E)-But-2-enoyl chloride (CAS NO.10487-71-5):

Density: 1.081 g/cm³ 
Flash Point: 35 °C
Boiling Point: 124.5 °C at 760 mmHg  
Index of Refraction: 1.44 
Molar Refractivity: 25.51 cm³ 
Molar Volume: 96.6 cm³ 
Polarizability: 10.11×10^-24cm³ 
Surface Tension: 27.8 dyne/cm 
Enthalpy of Vaporization: 36.24 kJ/mol 
Vapour Pressure: 12.7 mmHg at 25°C
Water Solubility: 3.596e+004(mg/L) at 25 °C   
Product Categories: pharmaceutical intermediates.

Safety Information about (E)-But-2-enoyl chloride (CAS NO.10487-71-5):
Hazard Codes: 
C: 
Risk Statements about (E)-But-2-enoyl chloride (CAS NO.10487-71-5):
R10: Flammable.
R34: Causes burns.
R36/37: Irritating to eyes and respiratory system.
Safety Statements about (E)-But-2-enoyl chloride (CAS NO.10487-71-5):
S16: Keep away from sources of ignition - No smoking.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S27: Take off immediately all contaminated clothing.
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 label where possible).
F13: Malodorous.
F19: Lachrymator.
F21: Sensitive to humidity.
RIDADR: UN 2920 8/PG 2
WGK Germany: 3
HazardClass: 8
PackingGroup: II

  The chemical synonyms of (E)-But-2-enoyl chloride (CAS NO.10487-71-5) are 2-Butenoyl chloride ; 2-Butenoylchloride ; But-2-enoylchloride ; Trans-2-butenoyl chloride ; Crotonyl chloride ; Crotonoyl chloride ; Crotonic acid chloride ; E-crotonyl chloride .