Molecular structure of 3-Chloropivaloyl chloride (CAS NO.4300-97-4) is:

Product Name: 3-Chloropivaloyl chloride
CAS Registry Number: 4300-97-4
IUPAC Name: 3-chloro-2,2-dimethylpropanoyl chloride
Molecular Weight: 155.02242 [g/mol]
Molecular Formula: C₅H₈Cl₂O
XLogP3-AA: 2.2
H-Bond Donor: 0
H-Bond Acceptor: 1
EINECS: 224-311-8 
Refractive index: n20/D 1.453(lit.)
Surface Tension: 30.5 dyne/cm
Density: 1.183 g/cm³
Flash Point: 69.2 °C
Enthalpy of Vaporization: 39.66 kJ/mol
Boiling Point: 160 °C at 760 mmHg
Vapour Pressure: 2.44 mmHg at 25°C
Water Solubility: Slightly soluble in water and less dense than water

 3-chloropivaloyl chloride(88912-27-0) is used to make other chemicals.

Safty information about 3-Chloropivaloyl chloride (CAS NO.4300-97-4) is:
Hazard Codes: C, Xi
Risk Statements: 34-36/37-23-22
34:  Causes burns 
36/37:  Irritating to eyes and respiratory system 
23:  Toxic by inhalation 
22:  Harmful if swallowed 
Safety Statements: 26-36/37/39-45
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36/37/39:  Wear suitable protective clothing, gloves and eye/face protection 
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)  
RIDADR: UN 3390 6.1/PG 1
WGK Germany: 3
F: 19: Lachrymator.
Hazard Note: Irritant
HazardClass: 8
PackingGroup: III

 3-Chloropivaloyl chloride ,its cas register number is 4300-97-4. It also can be called beta-Chloropivaloyl chloride ; 3-Chloro-2,2-dimethylpropaneyl chloride ; Propanoyl chloride, 3-chloro-2,2-dimethyl- ; Chloropivaloyl chloride ; Chloropivaloyl chloride [NA9263] [Poison] ; NA9263 ; Propanoyl chloride, 3-chloro-2,2-dimethyl- . It is a clear colorless to light yellow-brown liquid. It is very toxic by ingestion, inhalation and skin absorption. Contact may severely irritate skin, eyes, and mucous membranes. Also it is highly flammable.