Diazomethane

Empirical Formula: CH₂N₂
Molecular Weight: 42.04 
EINECS: 206-382-7 
Melting point: -145 °C
Appearance: Yellow gas with a musty odor
Structure of Diazomethane (CAS NO.334-88-3):
                   
IUPAC Name of Diazomethane (CAS NO.334-88-3): Diazomethane
Canonical SMILES: C=[N+]=[N-]
InChI: InChI=1S/CH2N2/c1-3-2/h1H2
InChIKey: YXHKONLOYHBTNS-UHFFFAOYSA-N

 Diazomethane (CAS NO.334-88-3)  is almost universally used as a solution in diethyl ether, and is also frequently used as a carbene source.

 Diazomethane (CAS NO.334-88-3) is prepared by hydrolysis of an etheric solution of an N-methyl nitrosamide with aqueous base.
                     

IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 (1987),p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 (1974),p. 223.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . EPA Genetic Toxicology Program. Community Right-To-Know List.

Confirmed carcinogen with experimental tumorigenic data. A poisonous irritant by inhalation. A powerful allergen. It can cause pulmonary edema and frequently causes hypersensitivity leading to asthmatic symptoms. Mutation data reported. Highly explosive when shocked, exposed to heat, or by chemical reaction. Undiluted liquid or gas may explode on contact with alkali metals, rough surfaces, heat (100°C), high-intensity light, or shock. When heated to decomposition or on contact with acid or acid fumes it emits highly toxic fumes of NO_x. Incompatible with alkali metals; calcium sulfate.
Hazard Codes: T
Risk Statements: 45 
R45:May cause cancer.
Safety Statements: 53-45 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S53:Avoid exposure - obtain special instructions before use.

OSHA PEL: TWA 0.2 ppm
ACGIH TLV: TWA 0.2 ppm; Suspected Human Carcinogen
DFG MAK: Animal Carcinogen, Suspected Human Carcinogen

For occupational chemical analysis use NIOSH: Diazomethane, 2515.

 Diazomethane ,its cas register number is 334-88-3. It also can be called Methane, diazo- ; and Azimethylene . It is one of the more common diazo compounds, and it is a popular methylating agent in the laboratory, but it is too hazardous. Diazomethane (CAS NO.334-88-3) can be treated with an excess of benzoic acid in cold Et₂O. It is toxic by inhalation or by contact with the skin or eyes (TLV 0.2ppm) and explodes when heated beyond 100 °C.