Dibromomethane

• Methylene bromide
• Methylene dibromide

Volatile, colorless to yellowish liquid with a sweet odor

Liquid

2.49 g · cm -3

-52 ° C

96-98 ° C

46 mbar ( 20 ° C)

• Slightly soluble in water (11.7 g · l-1 at 15 ° C )
• Soluble in most organic solvents

1.54 to 1.542

Attention

108 mg · kg -1 ( LD50, rat, oral)

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Dibromomethane is a chemical compound from the group of saturated aliphatic halogenated hydrocarbons and organic bromine compounds. It is a doubly brominated derivative of methane.

Occurrence

Dibromoethane is produced naturally by several Arctic macroalgae.

Production and representation

Dibromomethane, diiodomethane, similarly be obtained by reaction of bromoform with sodium arsenite and sodium hydroxide.

Another way of preparation is the reaction of bromine with the diiodomethane.

Properties

Dibromoethane is a volatile, colorless to yellowish liquid with a sweet odor. Under normal pressure, the compound boils at 97 ° C. The vapor pressure function is given by Antoine corresponding log10 (P) = A- ( B / ( T C )) ( P in bar, T in K) with A = 4.51734, B = 1546.096 and C = -28.977 in temperature range from 238 K to 372 K. The miscibility with water is limited. With increasing temperature the solubility of dibromomethane in water increases and increases the solubility of water in dibromomethane.

It decomposes when exposed to heat or light, bromine and bromine compounds arise.

Use

Dibromomethane is an intermediate in the preparation of herbicides and pesticides. Also it is used in low concentrations in halogen lamps.