Molecular Formula: C₂H₅ClMg
Molar mass: 88.82 g/mol
EINECS: 219-206-9
Storage temp: Water-free area
Water solubility: Reacts
Appearance: Dark brown solution
Product categories: Alkyl Metals;Mg (Magnesium) Compounds;Synthetic Organic Chemistry;Typical Metal Compounds;Alkyl Chemical Synthesis;Organic Bases;Grignard, Organometallic and Synthetic Reagents
Structure of Ethylmagnesium chloride (2386-64-3):
                   
H-Bond Donor: 0
H-Bond Acceptor: 2
IUPAC Name: Magnesium ethane chloride
Canonical SMILES: C[CH2-].[Mg+2].[Cl-]
InChI: InChI=1S/C2H5.ClH.Mg/c1-2;;/h1H2,2H3;1H;/q-1;;+2/p-1 
InChIKey: YCCXQARVHOPWFJ-UHFFFAOYSA-M

Carcinogenicity of Ethylmagnesium chloride (2386-64-3) hasn't been listed as a carcinogen by NTP, IARC,ACGIH, or CA Prop 65. And its toxicological properties have not been fully investigated.You can see actual entry in RTECS for complete information.

Hazard Codes: F+,C,F
Risk Statements:
11:  Highly Flammable
12:  Extremely Flammable
14:  Reacts violently with water
19:  May form explosive peroxides
20:  Harmful by inhalation
21:  Harmful in contact with skin
22:  Harmful if swallowed 
34:  Causes burns
Safety Statements:
6:  Keep under ... (inert gas to be specified by the manufacturer)
7:  Keep container tightly closed
8:  Keep container dry
16:  Keep away from sources of ignition - No smoking
24:  Avoid contact with skin
25:  Avoid contact with eyes
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical 36:  Wear suitable protective clothing
37:  Wear suitable gloves
39:  Wear eye/face protection
43:  In case of fire, use ... (indicate in the space the precise type of fire-fighting equipment. If water increases the risk add - Never use water)
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)

 Ethylmagnesium chloride (2386-64-3) also can be called Chloroethylmagnesium and Magnesium, chloroethyl- .It is hazardous,so the first aid measures and others should be known.Such as: When on the skin: get shoesmedical aid . Or in the eyes: get medical aid soon.While ,it's Inhaled: Remove from exposure and move to fresh air immediately.Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Do not induce vomiting, and get medical aid immediately.Notes to physician: Treat supportively and symptomatically.
In addition, Ethylmagnesium chloride (2386-64-3) is moisture sensitive with air and light.It is not compatible with strong oxidizing agents, acids, bases, alcohols, oxygen, organic halides, and you must not take it with ignition sources, and not be heated in the presence of water (including moist air), direct sunlight, and incompatible materials,moisture, excess heat and ignition sources.strong reducing agents, strong oxidizing agents and strong bases.strong oxidants and should be exposured prolonged to air and sunlight may form unstable peroxides.And also prevent it to broken down into hazardous decomposition products: oxides of magnesium, carbon dioxide, carbon monoxide.